Hey i have a MOFO 15 with a directed 2400d and a 3 farad cap, and i have the amp turned all the way up and the sub control is all up on the deck and its still not as loud as people say it should be... the box is built to specs, i dont understand can you help??? The sub is in a 97 GrandAm...
Replies (30)
swez on 01/5/2009 15:32:31
This is a very subjective topic with an objective series of responses/???'s...
1. Have system looked at and tested by a qualified car audio technician
2. An SPL meter would be a very helpful tool and better shops that sponsor DB Drags will have one on hand (Measure/verify the readings)
3. If this is a trunk mounted box and the rear seats flip down, you'll get more bass into the cabin (If not, you're stuck or plan to fabricate a vent in the rear deck to get more bass into the cabin)
Quote: "its still not as loud as people say it should be". (They may be right, but have no idea why)
Are "these people" qualified enough to improve the situation?
Do they understand acoustics, cabin gain affects, cancellation issues and adequate power from a car to amp diagnosis?
How is the sub oriented inside this car? (Please don't say the sub is firing up toward the trunk lid)
Also, this 3 Farad Cap, does it have a voltage display to show supply voltage from the charging system? If yes, what numbers are you seeing? That will help a lot.
Finally, please read this before you come back with additional information OK? "Help Us Help YOU".
http://www.clubknowledge.com/Car_Audio_FAQ/
Swez
cplkittle on 01/5/2009 16:24:40
Here are a few possibilities:
Sub enclosure type: Vented (ported) is 2x louder than sealed
How the sub is wired: The amp is 1400W RMS @ 4 ohms, and 2400W RMS @ 2 ohms.
The amp isn't all it promises to be: This amp appears to have 2 x 40A fuses. Using Ohm's law to calculate output (volts x amps = ohms) You get 80 Amps x 12 volts = 960 watts. There is no way in hell this amplifier can produce 2400 watts RMS unless you give it 30 volts DC.
It is very difficult to diagnose a problem like this without some very detailed information. Start by telling us what the voice coil configuration of the sub is (dual 4, dual 2, single 4, single 2 voice coils... etc.).
Also, is the sub wired parallel or in series to the amp?
Are you using both voice coils or just one?
What size power wire are you using to the amp?
glower0024 on 01/5/2009 19:45:03
i have the seats down and the voltage on the cap is low 12 in park, i cant afford a H.O altenator and im hooking up another batterie in the trunk soon, im running 4 gauge wire, ive got the sub wired pos to pos, neg to neg and then 1 wire from pos on 1 side and 1 wire from the neg on the other side out to the amp.... The directed i have has 3 40A fuses, the box has 2 4in ports 10 inchs deep just like it said to do it, and the sub is facing the back of the car not up lol
kirchatndftbl on 01/5/2009 20:35:14
http://www.poweracoustik.com/pa2006/product_AUDIO_wof_mofo.htm
is that the sub you have?? if so it should be a dual 2 ohm
and the way you stated the wiring configuration should put a net 1 ohm load on you amp.. and from what i could find about that amp i dont think its stable at 1 ohm...
what type of battery do you currently have under the hood??
consider a gel cell type battery thats made to take abuse (Optima yellow top or red top)
also have you done the big 3 upgrade??
http://www.sounddomain.com/ubbthreads.php/ubb/showflat/Number/312025/page/1#Post312025
ttocs on 01/5/2009 23:42:53
YOU CAN'T JUST THROW A 2ND BATTERY IN THE CAR AND CALL IT A DAY...
A 2nd batter can only be considered when the charging system has been upgraded to support to batteries and yours cannot keep up with 1. It is also VERY important to make sure the batteries are matched carefully and normally purchased at the same time so you can't go out and buy a 2nd one and throw it on your 1rst.
Follow swez's advice and he will lead you the correct way, I am tempted to delete the post above me since I cannot edit the part that is wrong. Disconnect the cap when you throw the 2nd in? C'mon man.....
kirchatndftbl on 01/6/2009 00:12:23
my bad ttocs. been a loooong day and just re read what i wrote and realized it didnt make since.
swez on 01/6/2009 03:39:12
Okay, looking into the details from glower's follow up post, that low 12-ish volts sounds fair at idle, but not going to feed this amp enough current to get the job done.
Looking at the year of your car, would suspect the typical CS-130 GM alternator is used here. (60/105A's) That design has been around for a long time, pretty reliable, but inadequate to feed the amp and car needs at the same time. This amp will draw close to 135A's at full power and typical 18' of #4 power cable is too small for this application.
Also, the sub wiring info mentioned, sounds like a 1 ohm load to your amp. If the amp is 1 ohm stable, all is well there. If the amp is not 1 ohm stable, a fried amp is not cheap to replace. (What's the model # on your amp?)
Other than low power from your cars' electrical system and small gage wiring, the rest sounds up to snuff if this amp can handle a 1 ohm load. The 15" MOFO is built like many Pro-Line woofers. (Takes abuse and comes back for more)
Comments?
Swez
glower0024 on 01/6/2009 11:06:35
This is the only link i could find for the amp because they are discontinued, but the amp is 1 ohm stable, so what gauge wire should i be running??? Thanks for all your help!!!http://carjamz.com/zen/index.php?main_page=product_info&products_id=1874
swez on 01/6/2009 13:56:16
So far, the gear selection is top notch and well paired. The most notable issue mentioned so far is a tad low on the voltage side. Part of that is the #4 gage power and ground cables. (Drop down to 1/0 as #2 is difficult to find)
The only other things left to do are to have the battery and ALT checked to verify they are doing their jobs. This is a free service from most good autoparts dealers. They can also do load tests to see how well the system reacts to load changes.
Just for fun, what's the crossover filter set to now? (LPF = 80 Hz.)
Then your SSF should be set at 30 or a tad lower.
Comments?
Swez
glower0024 on 01/6/2009 15:02:43
the lpf is all the way up as well as the gain, and i have no idea what SSF is lol, but what is PHASE??? its a switch on the amp, theres 2 choices, 0 and 180???
swez on 01/6/2009 19:05:56
OK, SSF is an "Ultrasonic Filter to block lows past the ported tuning frequency. (PTF) When we try to feed ported systems with frequencies well below the PTF, we run the risk of blowing expensive bass speakers.
The phase switch has more to do with the LPF network for the sub used. Try both settings at moderate power and see which setting blends the best with your other speakers
Swez
PS If your amp does not have an SSF or INF filter, they can be added to the inputs side of your amp. Some of the better HU's have this feature in the sub channel directory. Look there before moving on.
glower0024 on 01/7/2009 13:14:49
Would i be able to use the 4gauge wire for my big 3 change or should it be bigger???
swez on 01/7/2009 13:27:26
Yes, the #4 would be great along with the stock wires in there now. Just leave the stock wires in place and add the #4.
Swez
glower0024 on 01/7/2009 15:05:17
what would be the best way to wire my mofo??? And are the hifonics goliath 15's any good??? Thanx for all your help...
swez on 01/7/2009 18:07:52
I am not finding much tech info on your amp. Do you have the owner/install manual for this on hand? (Or find a .pdf link file off the internet) We need to know if this amp is 1 ohm stable or not.
OK, found this link and the D800,D1200 and D2400 are 1 ohm stable. Have a look at this picture and specs to see if this is the amp you have on hand:
http://www.lightav.com/car/directedaudio/directedamplifiers.html
In this case, you'll wire both coils in parallel:
Coil A & B Positives to amp Pos output lug
Coil A & B Negative to amp Neg output lug
The net ohmic rating is 1-ohm. Viola! Got all that?
Swez
glower0024 on 01/7/2009 18:23:33
Yes that is the amp i have, its the 2400, i thought it was 1 ohm stable, but wasnt too sure
glower0024 on 01/8/2009 17:08:53
so your saying i should have 4 wires running out of my box???
swez on 01/8/2009 18:28:18
Nope, you only need 2 wires from the box to amp. All the other wiring can be done on the inside of the box. Here's a wiring diagram that shows how to get a 1 ohm load from your Mofo 15.
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=1&woofer_imp=3
Easy huh?
Swez
glower0024 on 01/9/2009 06:59:57
ok sweet thats how i have it, and i found a LPF setting on my HU i can adjust it to 78 or 125 so i set it to 78 and switched the phase and it hits alot harder, but how can i get those real low notes to where i can feel them??? Would i have to change the box or....
swez on 01/9/2009 07:15:08
Possibility there... Do you have measurements of this box handy. For a 15" sub, ported and tuned properly, that gonna be a pretty good sized box.
Swez
swez on 01/9/2009 08:55:20
Did some digging and found ported box recommendations for the 15" MOFO sub:
http://www.poweracoustik.com/SUPPORT/MANUALS/PA-MOFOWoofer.pdf
As expected, the box is pretty large. (3.4 ft^3 internally) So you are looking at the external dimensions of some 30% larger here. The ports are 4" in dia, and 8-1/4" long. (2 ports)
Are you even close to this dimension now? (H,W, D & thickness of walls) Give external dimensions and we can calculate the rest.
Swez
glower0024 on 01/9/2009 12:33:04
WOW my box is way to small then, its 16.5in tall, 15in deep,22in wide, it has 2 ports that are 4in wide and 10in deep, and its made out of 3/4 in MDF, damn so thats probably whats been holdin up the sound the whole time
swez on 01/9/2009 15:09:37
Yep, 1 cf small makes a difference. Do you think a box with the following dimensions will fit in that trunk space:
Height: 16.5"
Width: 22.0"
Depth: 22.0"
2 ports: 4" dia x 8.25" L
The box internal here is 3.65 ft^3. When we factor the sub and port displacements, you'll have a 3.4 ft^3 box.
Swez
PS Are you learning anything new about how the entire system works? From your past few replies, I'd say you grew a good 6 inches taller.
glower0024 on 01/9/2009 15:59:28
yes it would fit, about how much is some MDF to make that box??? Yes ive been learning alot thanks to you lol, i appreciate it!!!
swez on 01/9/2009 16:49:26
Shop around via the phone to see what kind of rates are out there for MDF. I cannot say as I have not been inside a big box store for a long while. Am guestimating you need a tad over 1/2 sheet for this project. Some good carpentry glue, a pound of #6 x 2-1/2" drywall screws and a tube of silicone sealer. (RTV) (Figure about $40.00 to
One thing to consider, at Home Depot they can rough cut all your panels for under $3.00. It's a lot easier to handle that way and getting it home w/o a buddies truck or panel van.
The last large box I build was done this way. I went in about an hour before closing, had a cut sheet list and found a younger guy who was not too busy and liked my plans. (He was a freshman basshead too)
Well, he made all the rough cuts as requested and asked if I needed help loading them. He did not charge for the extra cuts, so gave him a cash tip instead.
P/A's build sheet recommends 1" thick fiberglass as a sound dampener. An on the cheap 3/4-1.0" carpet padding does just as well for free. Just go tooling through the neighborhood looking for folks that are tossing out old carpet and backing. As long as it's reasonably clean and does not smell of pet pee, you're good to go.
Comments?
Swez
PS You are being a very good student! When you finish this project well, I'll hand the chalk over to you and let you teach another. CLAP
glower0024 on 01/10/2009 16:47:02
ok so i measured my trunk and the box that speaker calls for will not fit, what should i do, buy a new speaker lol
swez on 01/10/2009 19:32:36
That might be a last ditch option after we have looked at what you do have for space. We can adjust the box shape to fit by going taller and wider, but not as deep. (This takes some careful measuring to squeeze out every available space you have)
Can you take additional measurements and tell us what the max H, D & W would be able to fit in your space. Knowing the max limits available, we may be able to come pretty close to woofer specs needed and use the present sub.
NOTE: The baffle board the sub mounts to is a fixed dimension. (16.5" x 16.5" min) The rest of the box is up for grabs and open to investigation.
Finally, we may have to consider a compound chamber design to get the job done in this project. That will take some serious planning and design time, but we have some very talented box designers here at CK to help. One has to think well in 3-Dimensions in such cases. If it can be done, we'll try to help you discover the best way.
Swez
PS How are your graphics skills with a computer? This might mean calling in a buddy that has good skills to help. Think about who that might be. "newB" is very good here at CK on such designs. Maybe we can bring him into the picture and see what his trained eyes can see?
glower0024 on 01/26/2009 19:10:32
Hey i was wondering if i was to take the back seat completely out, and put a piece of wood to cover the opening to the trunk with the magnet of the speaker facing towards the front of the car, would that sound good at all??? i have saw a few cars setup like that and was kinda curious...
swez on 01/26/2009 19:47:53
A few guys here have done that with good success. On the trunk side of the car, you'll want a box to help your woofers pressurized, (Sealed) or if ported, tuned to get your lows right.
Just firing the subs into the trunk is more like a free-air design and power handling of the subs will be compromized and subject to damage of the woofers unless they are free-air subs.
MOFO subs are pretty robust, but they are not free-air subs. You'll need to build and box fot them.
Comments?
Swez
ckoscin2 on 01/27/2009 23:45:30
i work at lowe's and our prices on mdf are about $20 to 25(i think) a 4x8 sheet of 3/4 in.
thumbs down to home depot MAD
Replies (30)
swez on 01/5/2009 15:32:31
This is a very subjective topic with an objective series of responses/???'s...
1. Have system looked at and tested by a qualified car audio technician
2. An SPL meter would be a very helpful tool and better shops that sponsor DB Drags will have one on hand (Measure/verify the readings)
3. If this is a trunk mounted box and the rear seats flip down, you'll get more bass into the cabin (If not, you're stuck or plan to fabricate a vent in the rear deck to get more bass into the cabin)
Quote: "its still not as loud as people say it should be". (They may be right, but have no idea why)
Are "these people" qualified enough to improve the situation?
Do they understand acoustics, cabin gain affects, cancellation issues and adequate power from a car to amp diagnosis?
How is the sub oriented inside this car? (Please don't say the sub is firing up toward the trunk lid)
Also, this 3 Farad Cap, does it have a voltage display to show supply voltage from the charging system? If yes, what numbers are you seeing? That will help a lot.
Finally, please read this before you come back with additional information OK? "Help Us Help YOU".
http://www.clubknowledge.com/Car_Audio_FAQ/
Swez
cplkittle on 01/5/2009 16:24:40
Here are a few possibilities:
Sub enclosure type: Vented (ported) is 2x louder than sealed
How the sub is wired: The amp is 1400W RMS @ 4 ohms, and 2400W RMS @ 2 ohms.
The amp isn't all it promises to be: This amp appears to have 2 x 40A fuses. Using Ohm's law to calculate output (volts x amps = ohms) You get 80 Amps x 12 volts = 960 watts. There is no way in hell this amplifier can produce 2400 watts RMS unless you give it 30 volts DC.
It is very difficult to diagnose a problem like this without some very detailed information. Start by telling us what the voice coil configuration of the sub is (dual 4, dual 2, single 4, single 2 voice coils... etc.).
Also, is the sub wired parallel or in series to the amp?
Are you using both voice coils or just one?
What size power wire are you using to the amp?
glower0024 on 01/5/2009 19:45:03
i have the seats down and the voltage on the cap is low 12 in park, i cant afford a H.O altenator and im hooking up another batterie in the trunk soon, im running 4 gauge wire, ive got the sub wired pos to pos, neg to neg and then 1 wire from pos on 1 side and 1 wire from the neg on the other side out to the amp.... The directed i have has 3 40A fuses, the box has 2 4in ports 10 inchs deep just like it said to do it, and the sub is facing the back of the car not up lol
kirchatndftbl on 01/5/2009 20:35:14
http://www.poweracoustik.com/pa2006/product_AUDIO_wof_mofo.htm
is that the sub you have?? if so it should be a dual 2 ohm
and the way you stated the wiring configuration should put a net 1 ohm load on you amp.. and from what i could find about that amp i dont think its stable at 1 ohm...
what type of battery do you currently have under the hood??
consider a gel cell type battery thats made to take abuse (Optima yellow top or red top)
also have you done the big 3 upgrade??
http://www.sounddomain.com/ubbthreads.php/ubb/showflat/Number/312025/page/1#Post312025
ttocs on 01/5/2009 23:42:53
YOU CAN'T JUST THROW A 2ND BATTERY IN THE CAR AND CALL IT A DAY...
A 2nd batter can only be considered when the charging system has been upgraded to support to batteries and yours cannot keep up with 1. It is also VERY important to make sure the batteries are matched carefully and normally purchased at the same time so you can't go out and buy a 2nd one and throw it on your 1rst.
Follow swez's advice and he will lead you the correct way, I am tempted to delete the post above me since I cannot edit the part that is wrong. Disconnect the cap when you throw the 2nd in? C'mon man.....
kirchatndftbl on 01/6/2009 00:12:23
my bad ttocs. been a loooong day and just re read what i wrote and realized it didnt make since.
swez on 01/6/2009 03:39:12
Okay, looking into the details from glower's follow up post, that low 12-ish volts sounds fair at idle, but not going to feed this amp enough current to get the job done.
Looking at the year of your car, would suspect the typical CS-130 GM alternator is used here. (60/105A's) That design has been around for a long time, pretty reliable, but inadequate to feed the amp and car needs at the same time. This amp will draw close to 135A's at full power and typical 18' of #4 power cable is too small for this application.
Also, the sub wiring info mentioned, sounds like a 1 ohm load to your amp. If the amp is 1 ohm stable, all is well there. If the amp is not 1 ohm stable, a fried amp is not cheap to replace. (What's the model # on your amp?)
Other than low power from your cars' electrical system and small gage wiring, the rest sounds up to snuff if this amp can handle a 1 ohm load. The 15" MOFO is built like many Pro-Line woofers. (Takes abuse and comes back for more)
Comments?
Swez
glower0024 on 01/6/2009 11:06:35
This is the only link i could find for the amp because they are discontinued, but the amp is 1 ohm stable, so what gauge wire should i be running??? Thanks for all your help!!!http://carjamz.com/zen/index.php?main_page=product_info&products_id=1874
swez on 01/6/2009 13:56:16
So far, the gear selection is top notch and well paired. The most notable issue mentioned so far is a tad low on the voltage side. Part of that is the #4 gage power and ground cables. (Drop down to 1/0 as #2 is difficult to find)
The only other things left to do are to have the battery and ALT checked to verify they are doing their jobs. This is a free service from most good autoparts dealers. They can also do load tests to see how well the system reacts to load changes.
Just for fun, what's the crossover filter set to now? (LPF = 80 Hz.)
Then your SSF should be set at 30 or a tad lower.
Comments?
Swez
glower0024 on 01/6/2009 15:02:43
the lpf is all the way up as well as the gain, and i have no idea what SSF is lol, but what is PHASE??? its a switch on the amp, theres 2 choices, 0 and 180???
swez on 01/6/2009 19:05:56
OK, SSF is an "Ultrasonic Filter to block lows past the ported tuning frequency. (PTF) When we try to feed ported systems with frequencies well below the PTF, we run the risk of blowing expensive bass speakers.
The phase switch has more to do with the LPF network for the sub used. Try both settings at moderate power and see which setting blends the best with your other speakers
Swez
PS If your amp does not have an SSF or INF filter, they can be added to the inputs side of your amp. Some of the better HU's have this feature in the sub channel directory. Look there before moving on.
glower0024 on 01/7/2009 13:14:49
Would i be able to use the 4gauge wire for my big 3 change or should it be bigger???
swez on 01/7/2009 13:27:26
Yes, the #4 would be great along with the stock wires in there now. Just leave the stock wires in place and add the #4.
Swez
glower0024 on 01/7/2009 15:05:17
what would be the best way to wire my mofo??? And are the hifonics goliath 15's any good??? Thanx for all your help...
swez on 01/7/2009 18:07:52
I am not finding much tech info on your amp. Do you have the owner/install manual for this on hand? (Or find a .pdf link file off the internet) We need to know if this amp is 1 ohm stable or not.
OK, found this link and the D800,D1200 and D2400 are 1 ohm stable. Have a look at this picture and specs to see if this is the amp you have on hand:
http://www.lightav.com/car/directedaudio/directedamplifiers.html
In this case, you'll wire both coils in parallel:
Coil A & B Positives to amp Pos output lug
Coil A & B Negative to amp Neg output lug
The net ohmic rating is 1-ohm. Viola! Got all that?
Swez
glower0024 on 01/7/2009 18:23:33
Yes that is the amp i have, its the 2400, i thought it was 1 ohm stable, but wasnt too sure
glower0024 on 01/8/2009 17:08:53
so your saying i should have 4 wires running out of my box???
swez on 01/8/2009 18:28:18
Nope, you only need 2 wires from the box to amp. All the other wiring can be done on the inside of the box. Here's a wiring diagram that shows how to get a 1 ohm load from your Mofo 15.
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp?submitted=true&woofer_qty=1&woofer_imp=3
Easy huh?
Swez
glower0024 on 01/9/2009 06:59:57
ok sweet thats how i have it, and i found a LPF setting on my HU i can adjust it to 78 or 125 so i set it to 78 and switched the phase and it hits alot harder, but how can i get those real low notes to where i can feel them??? Would i have to change the box or....
swez on 01/9/2009 07:15:08
Possibility there... Do you have measurements of this box handy. For a 15" sub, ported and tuned properly, that gonna be a pretty good sized box.
Swez
swez on 01/9/2009 08:55:20
Did some digging and found ported box recommendations for the 15" MOFO sub:
http://www.poweracoustik.com/SUPPORT/MANUALS/PA-MOFOWoofer.pdf
As expected, the box is pretty large. (3.4 ft^3 internally) So you are looking at the external dimensions of some 30% larger here. The ports are 4" in dia, and 8-1/4" long. (2 ports)
Are you even close to this dimension now? (H,W, D & thickness of walls) Give external dimensions and we can calculate the rest.
Swez
glower0024 on 01/9/2009 12:33:04
WOW my box is way to small then, its 16.5in tall, 15in deep,22in wide, it has 2 ports that are 4in wide and 10in deep, and its made out of 3/4 in MDF, damn so thats probably whats been holdin up the sound the whole time
swez on 01/9/2009 15:09:37
Yep, 1 cf small makes a difference. Do you think a box with the following dimensions will fit in that trunk space:
Height: 16.5"
Width: 22.0"
Depth: 22.0"
2 ports: 4" dia x 8.25" L
The box internal here is 3.65 ft^3. When we factor the sub and port displacements, you'll have a 3.4 ft^3 box.
Swez
PS Are you learning anything new about how the entire system works? From your past few replies, I'd say you grew a good 6 inches taller.
glower0024 on 01/9/2009 15:59:28
yes it would fit, about how much is some MDF to make that box??? Yes ive been learning alot thanks to you lol, i appreciate it!!!
swez on 01/9/2009 16:49:26
Shop around via the phone to see what kind of rates are out there for MDF. I cannot say as I have not been inside a big box store for a long while. Am guestimating you need a tad over 1/2 sheet for this project. Some good carpentry glue, a pound of #6 x 2-1/2" drywall screws and a tube of silicone sealer. (RTV) (Figure about $40.00 to
One thing to consider, at Home Depot they can rough cut all your panels for under $3.00. It's a lot easier to handle that way and getting it home w/o a buddies truck or panel van.
The last large box I build was done this way. I went in about an hour before closing, had a cut sheet list and found a younger guy who was not too busy and liked my plans. (He was a freshman basshead too)
Well, he made all the rough cuts as requested and asked if I needed help loading them. He did not charge for the extra cuts, so gave him a cash tip instead.
P/A's build sheet recommends 1" thick fiberglass as a sound dampener. An on the cheap 3/4-1.0" carpet padding does just as well for free. Just go tooling through the neighborhood looking for folks that are tossing out old carpet and backing. As long as it's reasonably clean and does not smell of pet pee, you're good to go.
Comments?
Swez
PS You are being a very good student! When you finish this project well, I'll hand the chalk over to you and let you teach another. CLAP
glower0024 on 01/10/2009 16:47:02
ok so i measured my trunk and the box that speaker calls for will not fit, what should i do, buy a new speaker lol
swez on 01/10/2009 19:32:36
That might be a last ditch option after we have looked at what you do have for space. We can adjust the box shape to fit by going taller and wider, but not as deep. (This takes some careful measuring to squeeze out every available space you have)
Can you take additional measurements and tell us what the max H, D & W would be able to fit in your space. Knowing the max limits available, we may be able to come pretty close to woofer specs needed and use the present sub.
NOTE: The baffle board the sub mounts to is a fixed dimension. (16.5" x 16.5" min) The rest of the box is up for grabs and open to investigation.
Finally, we may have to consider a compound chamber design to get the job done in this project. That will take some serious planning and design time, but we have some very talented box designers here at CK to help. One has to think well in 3-Dimensions in such cases. If it can be done, we'll try to help you discover the best way.
Swez
PS How are your graphics skills with a computer? This might mean calling in a buddy that has good skills to help. Think about who that might be. "newB" is very good here at CK on such designs. Maybe we can bring him into the picture and see what his trained eyes can see?
glower0024 on 01/26/2009 19:10:32
Hey i was wondering if i was to take the back seat completely out, and put a piece of wood to cover the opening to the trunk with the magnet of the speaker facing towards the front of the car, would that sound good at all??? i have saw a few cars setup like that and was kinda curious...
swez on 01/26/2009 19:47:53
A few guys here have done that with good success. On the trunk side of the car, you'll want a box to help your woofers pressurized, (Sealed) or if ported, tuned to get your lows right.
Just firing the subs into the trunk is more like a free-air design and power handling of the subs will be compromized and subject to damage of the woofers unless they are free-air subs.
MOFO subs are pretty robust, but they are not free-air subs. You'll need to build and box fot them.
Comments?
Swez
ckoscin2 on 01/27/2009 23:45:30
i work at lowe's and our prices on mdf are about $20 to 25(i think) a 4x8 sheet of 3/4 in.
thumbs down to home depot MAD
Copyright ClubKnowledge 2009 * All Rights Reserved
