Hi I'm doing some minor additions on to my friends 300zx and I have a question his car is a coupe ( two seat) we wanted to put the 2 subs right behind the two head rests is this possible?
Replies (23)
Tinker18 on 10/12/2004 13:48:33
do you mean behind the headrests as in under the window?
alanjlamore on 10/12/2004 14:48:52
Hey, I was just checking online to see what the 300zx looked like and found this website:
http://rides.300zx.co.uk/rides/12/
Maybe it'll give you some ideas.
coper40 on 10/12/2004 15:33:02
Ya I meant right behind the head rest where there is just a panel being used for nothing....I just wanted to know if it would be safe to do?
Tinker18 on 10/12/2004 15:46:08
safe, yeah, smart? not exactly. i mean its a great idea, but i wouldnt want my subs/sub box where someone could get a real easy look at it, and maybe they end up getting stolen. what kinda subs are they? and are you talking about a prefab box or a custom built for them? their may not be enough room for them, depending on the amount of airspace needed for each woofer.
-KP
coper40 on 10/12/2004 21:25:08
we decided that only one 12 inch would be good.... and there will probably be a peice of tinted plexiglass over it for protection purposes.... it wouldn't be box it would be sunk in
coper40 on 10/12/2004 21:25:22
thanks
ttocs on 10/12/2004 22:15:05
how close will it be from your head?
coper40 on 10/12/2004 22:20:00
like a foot or 2
Tinker18 on 10/13/2004 23:05:03
thats gonna hurt. lol
coper40 on 10/15/2004 10:30:57
ya but it wont be to bad cause hes only going to drive the car in the spring summer and fall and mostly when he can take the t tops off.....
uochronos on 10/15/2004 15:37:34
if you get a reading of 140db at 8 feet or a reading of 140db at 2 foot its the same preasure it well hurt. this set up well work great you just wont have to turn volume up as far to get it loud. i have a extended cab ranger my sub sits maybe 2-3feet from the back of my head. with no cushin or anything inbetween me and it and it doesnt hurt anyworse at high volume then the same setup did in my old car where the sub was about 6+ feet from me.
only thing i would worry about is theft as mentioned above but with this nice of a car i would hope its being stored in a garage or somewhere where its not going to get broken into in the first place hehe.
Chronos
coper40 on 10/15/2004 23:35:34
so it should work if i just sink it into the original peice of space behind the seat
Tinker18 on 10/15/2004 23:56:28
ok. question here. are you going to sink a pre fab box into it? or you just going to cut a hole and stick a sub in it? if its the latter, well, i wouldnt advise it. give us a little more detail here, what kinda sub is it? are you using a prefab box to put it in the back or are you going to make one?
-KP
coper40 on 10/16/2004 13:29:44
we were just going to drop it in...... should we put a prefab one in tho?
Tinker18 on 10/16/2004 14:46:12
ok, so you were just gonna cut a hole in the area under the window? and drop the sub in it?......one problem with this, is that im pretty sure that its not sealed, and the area back there has got to be greater than what the recommended enclosure size for the sub woofer is, since it wouldnt be in a box, it would just be stuck in there, it would be very easy to over power the sub, and maybe overexcursion and ruin your sub. what kind of subwoofer is it? give me the model number so i can look it up. plz.
-KP
P0werLifter on 10/16/2004 15:34:02
You can run with this idea...but there is going to be alot more work involved than just cutting a hole in the rear dash section and dropping in a subwoofer. I suspect there are going to be some strength issues with the rear panel not being able to support the weight, and constant battering of the subwoofers excursion. In order to do this install i believe your going to need to strengthen the rear paneling, and also build an enclosure that will be air right, around the rear of the sub designed to accomidate a certain cubic ft.
Subwoofers have specs that are specific to the subwoofers enclosure design. If your not really familiar with the specs a subwoofer has, then you really need to stick with the reccomended cu ft requirement. Throwing a subwoofer into a rear dash isnt the best idea in the world unless your ready to fabricate the rear box section, strengthen the front baffle and make it look nice and pretty.
If you infact you dont build the rear section of the enclosure, this will be somewhat if a "free-air" type design. Some people have made it work, but you need the correct sub with the right specs to do this correctly. Much more math involved. if you have the wrong sub for the install, it will sound sloppy.
What type of subs are you going to run, what amplifier?
coper40 on 10/16/2004 23:34:06
we dont have sub yet just because I figured that it would be smart to check out the kind of stuff you could do before then choose the sub when we picked the place.... I was thinking a type X in the spare wheel well .....
uochronos on 10/17/2004 00:24:58
hmm might wanna rethink that a few reasons.
1 a single type 4 in my truck can get un barably loud hehe
2 a small car like that has a small alternator that type X takes 700-1000watts to push it and that well require very expensive electrical upgrades
also 1000watts isnt needed when its that close to you and in the cabin of the car.
i would think a single type R would be more then enough... but thats just me. remember though is so close to you that its going to be louder then you want at full volume with a type r let alone a type X
just some stuff to think on,.
Chronos
coper40 on 10/17/2004 09:35:55
so even if we put the type R in the wheel well it would still be to loud?
swez on 10/17/2004 10:36:30
A type R in the spare tire well is a good option... especially if the rear seat fold down to a large open cargo area.
Would not need a huge amp here either. A 300 watt (RMS) amp like the MRD-300 would be plenty of amping power for a 10' or 12" sub and not a huge drain on the electrical system. (about 25-30A of current draw)
The trick here, is to fabricate an enclosure that will be of proper internal air space (volume in ft^3 or liters) for the sub you choose. Can use a sealed or ported design and hide the sub well under the carpet too. Most guys use a fiberglass moulded insert of proper internal dimensions and then use a 3/4" thick cap of MDF board to mount the sub. He will probably need to use sound deadener in the well too.
Another option would be to use a large diameter SonoTube as an enclosure with end caps and a mounting flange for the sub mounting board. This is much cheaper and easier to do than fiberglass as well.
Can you measure the diameter of the tire and the depth of the well and get back to us with that info? Then we can run some numbers and advise your options.
Swez
PS A tire well mount is a good choice and he can anticipate bass SPL in the high 120's to low 130's dB of bass. That's a lot of bass power in a small vehicle. Best to make this a stealth install as much as possible. Hiding all gear from view is a very wise choice. Does he have an alarm system as well?
coper40 on 10/17/2004 13:39:29
nope he doesnt have an alarm he should be getting one tho..... there is not back seat in the car actually so there is a lot of extra space there.
Tinker18 on 10/18/2004 19:34:12
if he gets any type of decent speakers and such, where he spends a good size amount of money, he needs to get an alarm, before anything, gotta protect your investment right?
-KP
coper40 on 10/18/2004 21:36:55
hes lookin at buyin hart square subs.
Replies (23)
Tinker18 on 10/12/2004 13:48:33
do you mean behind the headrests as in under the window?
alanjlamore on 10/12/2004 14:48:52
Hey, I was just checking online to see what the 300zx looked like and found this website:
http://rides.300zx.co.uk/rides/12/
Maybe it'll give you some ideas.
coper40 on 10/12/2004 15:33:02
Ya I meant right behind the head rest where there is just a panel being used for nothing....I just wanted to know if it would be safe to do?
Tinker18 on 10/12/2004 15:46:08
safe, yeah, smart? not exactly. i mean its a great idea, but i wouldnt want my subs/sub box where someone could get a real easy look at it, and maybe they end up getting stolen. what kinda subs are they? and are you talking about a prefab box or a custom built for them? their may not be enough room for them, depending on the amount of airspace needed for each woofer.
-KP
coper40 on 10/12/2004 21:25:08
we decided that only one 12 inch would be good.... and there will probably be a peice of tinted plexiglass over it for protection purposes.... it wouldn't be box it would be sunk in
coper40 on 10/12/2004 21:25:22
thanks
ttocs on 10/12/2004 22:15:05
how close will it be from your head?
coper40 on 10/12/2004 22:20:00
like a foot or 2
Tinker18 on 10/13/2004 23:05:03
thats gonna hurt. lol
coper40 on 10/15/2004 10:30:57
ya but it wont be to bad cause hes only going to drive the car in the spring summer and fall and mostly when he can take the t tops off.....
uochronos on 10/15/2004 15:37:34
if you get a reading of 140db at 8 feet or a reading of 140db at 2 foot its the same preasure it well hurt. this set up well work great you just wont have to turn volume up as far to get it loud. i have a extended cab ranger my sub sits maybe 2-3feet from the back of my head. with no cushin or anything inbetween me and it and it doesnt hurt anyworse at high volume then the same setup did in my old car where the sub was about 6+ feet from me.
only thing i would worry about is theft as mentioned above but with this nice of a car i would hope its being stored in a garage or somewhere where its not going to get broken into in the first place hehe.
Chronos
coper40 on 10/15/2004 23:35:34
so it should work if i just sink it into the original peice of space behind the seat
Tinker18 on 10/15/2004 23:56:28
ok. question here. are you going to sink a pre fab box into it? or you just going to cut a hole and stick a sub in it? if its the latter, well, i wouldnt advise it. give us a little more detail here, what kinda sub is it? are you using a prefab box to put it in the back or are you going to make one?
-KP
coper40 on 10/16/2004 13:29:44
we were just going to drop it in...... should we put a prefab one in tho?
Tinker18 on 10/16/2004 14:46:12
ok, so you were just gonna cut a hole in the area under the window? and drop the sub in it?......one problem with this, is that im pretty sure that its not sealed, and the area back there has got to be greater than what the recommended enclosure size for the sub woofer is, since it wouldnt be in a box, it would just be stuck in there, it would be very easy to over power the sub, and maybe overexcursion and ruin your sub. what kind of subwoofer is it? give me the model number so i can look it up. plz.
-KP
P0werLifter on 10/16/2004 15:34:02
You can run with this idea...but there is going to be alot more work involved than just cutting a hole in the rear dash section and dropping in a subwoofer. I suspect there are going to be some strength issues with the rear panel not being able to support the weight, and constant battering of the subwoofers excursion. In order to do this install i believe your going to need to strengthen the rear paneling, and also build an enclosure that will be air right, around the rear of the sub designed to accomidate a certain cubic ft.
Subwoofers have specs that are specific to the subwoofers enclosure design. If your not really familiar with the specs a subwoofer has, then you really need to stick with the reccomended cu ft requirement. Throwing a subwoofer into a rear dash isnt the best idea in the world unless your ready to fabricate the rear box section, strengthen the front baffle and make it look nice and pretty.
If you infact you dont build the rear section of the enclosure, this will be somewhat if a "free-air" type design. Some people have made it work, but you need the correct sub with the right specs to do this correctly. Much more math involved. if you have the wrong sub for the install, it will sound sloppy.
What type of subs are you going to run, what amplifier?
coper40 on 10/16/2004 23:34:06
we dont have sub yet just because I figured that it would be smart to check out the kind of stuff you could do before then choose the sub when we picked the place.... I was thinking a type X in the spare wheel well .....
uochronos on 10/17/2004 00:24:58
hmm might wanna rethink that a few reasons.
1 a single type 4 in my truck can get un barably loud hehe
2 a small car like that has a small alternator that type X takes 700-1000watts to push it and that well require very expensive electrical upgrades
also 1000watts isnt needed when its that close to you and in the cabin of the car.
i would think a single type R would be more then enough... but thats just me. remember though is so close to you that its going to be louder then you want at full volume with a type r let alone a type X
just some stuff to think on,.
Chronos
coper40 on 10/17/2004 09:35:55
so even if we put the type R in the wheel well it would still be to loud?
swez on 10/17/2004 10:36:30
A type R in the spare tire well is a good option... especially if the rear seat fold down to a large open cargo area.
Would not need a huge amp here either. A 300 watt (RMS) amp like the MRD-300 would be plenty of amping power for a 10' or 12" sub and not a huge drain on the electrical system. (about 25-30A of current draw)
The trick here, is to fabricate an enclosure that will be of proper internal air space (volume in ft^3 or liters) for the sub you choose. Can use a sealed or ported design and hide the sub well under the carpet too. Most guys use a fiberglass moulded insert of proper internal dimensions and then use a 3/4" thick cap of MDF board to mount the sub. He will probably need to use sound deadener in the well too.
Another option would be to use a large diameter SonoTube as an enclosure with end caps and a mounting flange for the sub mounting board. This is much cheaper and easier to do than fiberglass as well.
Can you measure the diameter of the tire and the depth of the well and get back to us with that info? Then we can run some numbers and advise your options.
Swez
PS A tire well mount is a good choice and he can anticipate bass SPL in the high 120's to low 130's dB of bass. That's a lot of bass power in a small vehicle. Best to make this a stealth install as much as possible. Hiding all gear from view is a very wise choice. Does he have an alarm system as well?
coper40 on 10/17/2004 13:39:29
nope he doesnt have an alarm he should be getting one tho..... there is not back seat in the car actually so there is a lot of extra space there.
Tinker18 on 10/18/2004 19:34:12
if he gets any type of decent speakers and such, where he spends a good size amount of money, he needs to get an alarm, before anything, gotta protect your investment right?
-KP
coper40 on 10/18/2004 21:36:55
hes lookin at buyin hart square subs.
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