I just received my AXT 1200.2 and I was wondering if you were using the DDB, whatever it is?. Other than that I love this amp, but my old Hifonics seemed to run cooler that this one. Could the amp be clipping?
Replies (38)
uochronos on 02/24/2005 13:08:14
DDB? its been for ever since i tinkered with the amp so i dont remember what all the nobs where... if DDB is bass boost then i have it all the way off.
what load are you giving the amp? mine runs reasonably cool... after about 30 minutes to an hour it gets warm to the touch but never like hot to where its uncomfortable to touch.
if your giving it above a 2 ohm laod stereo and above a 4 ohm load bridged you should be fine.
i'm comparing this to my PG tantrum 500.2 though which gets quite warm to the touch after about and hour of use.
if your boosts are all set flat and the gain is set correctly. i have found that 2volts on the gain is just turned a bit right of the halfway mark. or at least thats where my ear told me i was getting the most clean power.
if your clipping the signal you would be able to hear it. slowly turn the gain counter clock wise it should get quieter but listen and see if you get alot less distortion as you turn it. if the sub gets alot cleaner as you slowly turn it then you where priobaly clipping. turn the dial extremly slowly though no need for big jumps.
also check out swez's tuning article in the DIY section that should help you out as well.
Chronos
PS
hope your as happy with your 1200.2 in the long run as i'am with mine...
SeJae on 02/24/2005 14:12:00
My amp is just warm to the touch at about the same time you stated. So, no worries then, thanx. I have the right loads on the amp so I dont think I'm clipping, but I plan on setting the gains with a multimeter. So I'm about to find out how reliable my ears are. As for the DDB, I have it off. Thanx again.
SeJae on 02/24/2005 15:34:38
Can anyone tell me where I can get those F-mods, so I can go vented?.
uochronos on 02/24/2005 16:03:44
www.thezeb.com www.partsexpress.com www.crutchfield.com all sell them i belive.
Chronos
SeJae on 02/25/2005 13:18:45
Well, I called partsxpress and the guy told me with the specs of my sub and vented enclosure, I wouldnt require a f- mod unless I wanted one. So, I decided to save some cash and take his word for it.
uochronos on 02/25/2005 14:01:48
umm whats your sub tuned to?
if your tuning to say 20-25hz no reall need for a SS filter but if your tuned to 30-40hz or more then i would defiantly suggest one... i have seen so many subs taosted due to no SS filter... its less then 20$ why spend $100+ on a sub and then toast it because you skimped on this..
Just my 2 cents... i would never run a ported sub wihtout a SS filter of some sort.
Chronos
SeJae on 02/25/2005 15:53:27
From the specs I gave him, he calculated that I should have no problems at all. I thought he would tell me some bullsh!t to try an make a sale off of me, oh well. Also he said that I might have port noise, which is force and velocity, but how do I determine if I have some. Thanx
uochronos on 02/25/2005 16:37:05
the higher port velocity the higher the port noise. the larger the port the less port noise but the alrge around it gets the longer it must be to hit the tuning frequency..
what port tuning are you useing and what driver? if your tunred 35hz or more you really should run a SS filter rock and country dont have alot of bass below 40hz... but rap, dance, techno, trance,funk, etc all have alot of 30-50hz range bass. if you happen to have a song that hits at say 30hz alot and the tuning is 35hz then your going to over heat your driver likly eventualy.
Chronos
PS
isnt parts express great i love them because of there non pushy sales tactics... dont usualy have to worry about getting bad product advise from them..
SeJae on 02/25/2005 17:22:30
I dont know what my box is tuned at. My driver is the 16Ov2 and I love this thing. Again, I gave the salesman the specs on the box and the driver, which he told me all I should worry about was port noise. Also, he said that if I havent heard any port noise then I will probably never have a problem with it. My box is 5/8 MDF, H is 16.25" ,width is 21",and the D is 18. My slotted vent is 2"wide and 15" in height. Maybe this will help.
uochronos on 02/25/2005 17:26:05
we need 3 dimensions to get the port the ports width an hieght plus the length of the port.. without how long the port is its imposible tot ell if you need a SS filter. and there is no way for the guy at parts express to know if you need one or not wihtout it either,
Chronos
SeJae on 02/25/2005 17:50:14
Ok, I got a hold of the people I got the box from and they told me it was 2"W,15"h, and 11"D. I dont think those are correct, but I'll have to measure it myself.
uochronos on 02/25/2005 18:11:32
ya that doesnt seem right... seems like the port would have to be longer then 11"
Chronos
PS
i well try and find out what that would make your box tuned to.
SeJae on 02/25/2005 18:43:13
You might want to try 17" for the D and see if that will help. Thanx again U.
P0werLifter on 02/26/2005 03:42:22
Aight, plugged in the specs for the enclosure and port dimensions into BB6P just to get a quick idea of PTF. BB6P says ur tuned to about 36hz if i use 17" as your depth. I would still reccomend getting a SS filter here, better safe than sorry
SeJae on 02/26/2005 11:27:09
I measured from the inside of the port to the outside edge of the box and got approximately 16" in Depth. 2" in Width, and 15" in Heighth. Again my box is 5/8 thick. I hope you guys can help, Thanx .
uochronos on 02/26/2005 14:00:15
so it sounds like this box is tuned to about 35-40hz.... i would defiantly get a SS filter. rap, dance, and many other typs of music hit below 40hz often. it well cause your sub to over heat and likly burn a voice coil eventualy.
Chronos
PS
you well need a F-mod that is a 40hz high pass
SeJae on 02/26/2005 14:04:35
I going to a local sound shop to check on one. So I'll see what they say. Thanx
uochronos on 02/26/2005 14:48:49
just a bit of heads up no car audio shop has ever suggested a SS filter to me ever... infact i'm surprised and dismayed at how few of them even understand what one is and why you use it.. i can almost guarantee you he well say you dont need one..
again though why spend 200$ on the Ov2 and then skimp and destroy the sub because 20$ was to much to spend to make it error proof? seems like if 2 months down the road the VC burns out that its going to cost you 200$ instead of 20$.
Chronos
PS
VC burning or other over heating of the sub wont be covered by warrantee
SeJae on 02/26/2005 15:48:49
Well, no luck. Surprisingly, the salesmen I talked knew of the F-mod, but no one had one because of the newer amps come with the SS filter. This one particular salesmen had told me if my low pass filter was low enough then I could use that. When I looked on the AXT, the DDDB shows that I can go as low as 25hz on the LP filter. Do you think I could use it? Just merely wondering. It seems legit. Also, on partsexpress they only have a 30hz and 50hz Fmod. Which one should I use?
uochronos on 02/26/2005 16:33:25
you dont need a low pass filter to eb set at 80-100hz.. you need a seperate high pass filter(SS fillter) that is set at 40hz or so. a Low pass means you would only be able to play sound below that so if you set you low pass to 40hz then you well only play sound below 40hz which would be very bad.
Chronos
SeJae on 02/26/2005 16:52:01
I just got off the phone with partsexpress and talked to tech support and he informed me that I'll need the 30hz high pass fmod. I know it's a little low, but I'm pretty sure it will be safer in the long run either way. Thanx for all your U. I understand a little more now.
uochronos on 02/26/2005 17:01:13
i really wish you would go with the 35 or 40hz high pass.... its not lik it cuts off imidiatly even with a 40hz fmod high pass it well play down to 30-35hz
Chronos
as soon as your sub plays below Port tuning frequency your subs cone is going to move less and less if your tuned at 40hz which is about what it apears you are then by time you get down to 30hz the cone of the sub is no longer moving really all the sound comes from the port. once that happens the sub cant cool itself anymore and then things burn up.... we have been talking about this for awhile now and it seems you keep trying to find a way around using a 40hz SS filter? is there a reason for this?
SeJae on 02/26/2005 17:09:16
I looked on partsexpress for a 40hz and all they have is a 20hz, 30hz and a 50hz fmod. Again the tech recommended the 30hz.
uochronos on 02/26/2005 17:22:39
hmm lol maybe they stopped making them... i'm sure i had seen them before.... i'm just worried that a 30hz fmod isnt going to help you. once it get to 30hz your already well eblow PTF...
maybe goto Harrison Labs and ask them if they make them... you can buy directly from them as well. also you can run 2 sets of 70hz HP fmods and get 35hz hp... i'm not 100% sure how to run that though you would have to ask there techs..
Chronos
SeJae on 02/26/2005 18:01:43
I ran across a fmod on the Zeb, but it doesnt specify what frequency it is. It just says that it's a hp fmod. I gotta wait until Monday, oh well. Just have to lower the bass for a while. dammmmn
uochronos on 02/27/2005 02:34:15
ya i saw one on teh zeb too that didnt say what HZ it was...
i did goto harrisons labs site for you though and they dont list one that i see that is 40hz HP ... i think this is the same reason they dont have alot of like 25-35-45 ect its because they suggest running 2 in parellel and show you how to do it on there site for instance running 2 80hz HP 12db per octave together turns them into a 40hz HP 24db per octave crossover.. 24db per octave is much better for a SS filter too... sort of sucks though they dont sell a 40hz on...
i well looks and see if i can find another company with a similar product for you..
Chronos..
PS
if you listen to mostly rock and pop dont worry to much for a short time about listening to it quite.. or put in one of your CD's that has low bas and watch the sub if it starts to stop moving as much when the bas hits a certain level then you went below PTF..
SeJae on 02/27/2005 12:46:13
I don't listen to rock at all. I love rap music. So, my sub has probably stopped moving a couple of times now. I've also got some info from Partsexpress and the tech said if I don't really push the sub then I'll be alright. At least until I get the Fmod.
uochronos on 02/27/2005 20:35:33
not pushing it may help a bit... the issue is this though. the sub movment is what causes it to cool itself down. once the sub stops moving and power is going threw it it heats up from then on till it moves mroe again.
While not pushing it well help it not heat up as muchy because not as much power well go threw it. the issue here is if your say running it at half power and going below PTF it well over heat it may just take twice as long as with full power. its able to get ride of 500watts of heat easier then it can 1000watts but the VC is still heating up....
I'm having very little luck finding another company that makes something like the Fmods... but i well keep looking... i well see if swez knows also... or if he is reading this he can awnser as well hehe.
Chronos
SeJae on 02/27/2005 23:30:23
Yeah, the Swam, I mean the Swez can help. LOL I have been thinking of getting a box that is tuned to 30hz, but I havent priced one around the city yet. Thanx for all your help U. I really am endebted to you. Thanx, Thanx again.
uochronos on 02/28/2005 01:00:07
ya a box tuned lower would help... you could if you can get your current box apart ad a bit ofi length tuning it lower
Chronos
SeJae on 03/1/2005 11:54:12
I called Ben from Edesigns and gave him the same specs I gave you guys. And I told of my AXT didn't have a SSF. He replied that I will be running at 39hz and a fmod of 30hz will be fine and this configuration would not void my warranty.:) He said that the only thing I should worry about with the 16ov.2 is over powering the sub at low frequencies, but other than that I was good to go. No one else, but ED should know there own products, right.
uochronos on 03/1/2005 12:49:30
yep if you hurt your sub now which hopfully you shouldnt then you can say well you guys told me:)... i looked all over to though and couldnt find anyone who makes a actauly 40hz HP inline filter. other then ones that get wired into your speaker wire not your RCA's and i wasnt sure about noise from them...
Chronos
SeJae on 03/1/2005 13:20:59
I found a SSF on ebay for 25.00. It's made by Harrison Labs or a certified dealer. It looks pretty old. This is irrelevant since I already ordered my 30hz Fmod, oh well.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14931&item=5752589705
uochronos on 03/1/2005 21:09:49
ya look at that hehe.... funny how things always turn up once you stop searching for them..
Chronos
SeJae on 03/4/2005 10:45:25
Well, I put on the Fmod and I lost all kinds of power. That should'nt happen right?.. All I need to do is put the fmod in between the rca cables and the amp rca input, correct?! What the hell.......
uochronos on 03/4/2005 13:50:11
lost power? i dont understand? are you sure its the right Fmod? 30hz High Pass... make sure its not low pass and that it is 30hz...
SeJae on 03/4/2005 14:40:52
it's a30hz high pass filter. I used to put my deck on 22 and the rearview starts shaking. After putting the fmod on then I dont get any at all, but only at a higher volume.
uochronos on 03/4/2005 17:42:31
hmm that doesnt make any since it shouldnt effect anything above 30hz.... swez, ttocs, anyone? have some ideas on what could be going on here?
Chronos
Replies (38)
uochronos on 02/24/2005 13:08:14
DDB? its been for ever since i tinkered with the amp so i dont remember what all the nobs where... if DDB is bass boost then i have it all the way off.
what load are you giving the amp? mine runs reasonably cool... after about 30 minutes to an hour it gets warm to the touch but never like hot to where its uncomfortable to touch.
if your giving it above a 2 ohm laod stereo and above a 4 ohm load bridged you should be fine.
i'm comparing this to my PG tantrum 500.2 though which gets quite warm to the touch after about and hour of use.
if your boosts are all set flat and the gain is set correctly. i have found that 2volts on the gain is just turned a bit right of the halfway mark. or at least thats where my ear told me i was getting the most clean power.
if your clipping the signal you would be able to hear it. slowly turn the gain counter clock wise it should get quieter but listen and see if you get alot less distortion as you turn it. if the sub gets alot cleaner as you slowly turn it then you where priobaly clipping. turn the dial extremly slowly though no need for big jumps.
also check out swez's tuning article in the DIY section that should help you out as well.
Chronos
PS
hope your as happy with your 1200.2 in the long run as i'am with mine...
SeJae on 02/24/2005 14:12:00
My amp is just warm to the touch at about the same time you stated. So, no worries then, thanx. I have the right loads on the amp so I dont think I'm clipping, but I plan on setting the gains with a multimeter. So I'm about to find out how reliable my ears are. As for the DDB, I have it off. Thanx again.
SeJae on 02/24/2005 15:34:38
Can anyone tell me where I can get those F-mods, so I can go vented?.
uochronos on 02/24/2005 16:03:44
www.thezeb.com www.partsexpress.com www.crutchfield.com all sell them i belive.
Chronos
SeJae on 02/25/2005 13:18:45
Well, I called partsxpress and the guy told me with the specs of my sub and vented enclosure, I wouldnt require a f- mod unless I wanted one. So, I decided to save some cash and take his word for it.
uochronos on 02/25/2005 14:01:48
umm whats your sub tuned to?
if your tuning to say 20-25hz no reall need for a SS filter but if your tuned to 30-40hz or more then i would defiantly suggest one... i have seen so many subs taosted due to no SS filter... its less then 20$ why spend $100+ on a sub and then toast it because you skimped on this..
Just my 2 cents... i would never run a ported sub wihtout a SS filter of some sort.
Chronos
SeJae on 02/25/2005 15:53:27
From the specs I gave him, he calculated that I should have no problems at all. I thought he would tell me some bullsh!t to try an make a sale off of me, oh well. Also he said that I might have port noise, which is force and velocity, but how do I determine if I have some. Thanx
uochronos on 02/25/2005 16:37:05
the higher port velocity the higher the port noise. the larger the port the less port noise but the alrge around it gets the longer it must be to hit the tuning frequency..
what port tuning are you useing and what driver? if your tunred 35hz or more you really should run a SS filter rock and country dont have alot of bass below 40hz... but rap, dance, techno, trance,funk, etc all have alot of 30-50hz range bass. if you happen to have a song that hits at say 30hz alot and the tuning is 35hz then your going to over heat your driver likly eventualy.
Chronos
PS
isnt parts express great i love them because of there non pushy sales tactics... dont usualy have to worry about getting bad product advise from them..
SeJae on 02/25/2005 17:22:30
I dont know what my box is tuned at. My driver is the 16Ov2 and I love this thing. Again, I gave the salesman the specs on the box and the driver, which he told me all I should worry about was port noise. Also, he said that if I havent heard any port noise then I will probably never have a problem with it. My box is 5/8 MDF, H is 16.25" ,width is 21",and the D is 18. My slotted vent is 2"wide and 15" in height. Maybe this will help.
uochronos on 02/25/2005 17:26:05
we need 3 dimensions to get the port the ports width an hieght plus the length of the port.. without how long the port is its imposible tot ell if you need a SS filter. and there is no way for the guy at parts express to know if you need one or not wihtout it either,
Chronos
SeJae on 02/25/2005 17:50:14
Ok, I got a hold of the people I got the box from and they told me it was 2"W,15"h, and 11"D. I dont think those are correct, but I'll have to measure it myself.
uochronos on 02/25/2005 18:11:32
ya that doesnt seem right... seems like the port would have to be longer then 11"
Chronos
PS
i well try and find out what that would make your box tuned to.
SeJae on 02/25/2005 18:43:13
You might want to try 17" for the D and see if that will help. Thanx again U.
P0werLifter on 02/26/2005 03:42:22
Aight, plugged in the specs for the enclosure and port dimensions into BB6P just to get a quick idea of PTF. BB6P says ur tuned to about 36hz if i use 17" as your depth. I would still reccomend getting a SS filter here, better safe than sorry
SeJae on 02/26/2005 11:27:09
I measured from the inside of the port to the outside edge of the box and got approximately 16" in Depth. 2" in Width, and 15" in Heighth. Again my box is 5/8 thick. I hope you guys can help, Thanx .
uochronos on 02/26/2005 14:00:15
so it sounds like this box is tuned to about 35-40hz.... i would defiantly get a SS filter. rap, dance, and many other typs of music hit below 40hz often. it well cause your sub to over heat and likly burn a voice coil eventualy.
Chronos
PS
you well need a F-mod that is a 40hz high pass
SeJae on 02/26/2005 14:04:35
I going to a local sound shop to check on one. So I'll see what they say. Thanx
uochronos on 02/26/2005 14:48:49
just a bit of heads up no car audio shop has ever suggested a SS filter to me ever... infact i'm surprised and dismayed at how few of them even understand what one is and why you use it.. i can almost guarantee you he well say you dont need one..
again though why spend 200$ on the Ov2 and then skimp and destroy the sub because 20$ was to much to spend to make it error proof? seems like if 2 months down the road the VC burns out that its going to cost you 200$ instead of 20$.
Chronos
PS
VC burning or other over heating of the sub wont be covered by warrantee
SeJae on 02/26/2005 15:48:49
Well, no luck. Surprisingly, the salesmen I talked knew of the F-mod, but no one had one because of the newer amps come with the SS filter. This one particular salesmen had told me if my low pass filter was low enough then I could use that. When I looked on the AXT, the DDDB shows that I can go as low as 25hz on the LP filter. Do you think I could use it? Just merely wondering. It seems legit. Also, on partsexpress they only have a 30hz and 50hz Fmod. Which one should I use?
uochronos on 02/26/2005 16:33:25
you dont need a low pass filter to eb set at 80-100hz.. you need a seperate high pass filter(SS fillter) that is set at 40hz or so. a Low pass means you would only be able to play sound below that so if you set you low pass to 40hz then you well only play sound below 40hz which would be very bad.
Chronos
SeJae on 02/26/2005 16:52:01
I just got off the phone with partsexpress and talked to tech support and he informed me that I'll need the 30hz high pass fmod. I know it's a little low, but I'm pretty sure it will be safer in the long run either way. Thanx for all your U. I understand a little more now.
uochronos on 02/26/2005 17:01:13
i really wish you would go with the 35 or 40hz high pass.... its not lik it cuts off imidiatly even with a 40hz fmod high pass it well play down to 30-35hz
Chronos
as soon as your sub plays below Port tuning frequency your subs cone is going to move less and less if your tuned at 40hz which is about what it apears you are then by time you get down to 30hz the cone of the sub is no longer moving really all the sound comes from the port. once that happens the sub cant cool itself anymore and then things burn up.... we have been talking about this for awhile now and it seems you keep trying to find a way around using a 40hz SS filter? is there a reason for this?
SeJae on 02/26/2005 17:09:16
I looked on partsexpress for a 40hz and all they have is a 20hz, 30hz and a 50hz fmod. Again the tech recommended the 30hz.
uochronos on 02/26/2005 17:22:39
hmm lol maybe they stopped making them... i'm sure i had seen them before.... i'm just worried that a 30hz fmod isnt going to help you. once it get to 30hz your already well eblow PTF...
maybe goto Harrison Labs and ask them if they make them... you can buy directly from them as well. also you can run 2 sets of 70hz HP fmods and get 35hz hp... i'm not 100% sure how to run that though you would have to ask there techs..
Chronos
SeJae on 02/26/2005 18:01:43
I ran across a fmod on the Zeb, but it doesnt specify what frequency it is. It just says that it's a hp fmod. I gotta wait until Monday, oh well. Just have to lower the bass for a while. dammmmn
uochronos on 02/27/2005 02:34:15
ya i saw one on teh zeb too that didnt say what HZ it was...
i did goto harrisons labs site for you though and they dont list one that i see that is 40hz HP ... i think this is the same reason they dont have alot of like 25-35-45 ect its because they suggest running 2 in parellel and show you how to do it on there site for instance running 2 80hz HP 12db per octave together turns them into a 40hz HP 24db per octave crossover.. 24db per octave is much better for a SS filter too... sort of sucks though they dont sell a 40hz on...
i well looks and see if i can find another company with a similar product for you..
Chronos..
PS
if you listen to mostly rock and pop dont worry to much for a short time about listening to it quite.. or put in one of your CD's that has low bas and watch the sub if it starts to stop moving as much when the bas hits a certain level then you went below PTF..
SeJae on 02/27/2005 12:46:13
I don't listen to rock at all. I love rap music. So, my sub has probably stopped moving a couple of times now. I've also got some info from Partsexpress and the tech said if I don't really push the sub then I'll be alright. At least until I get the Fmod.
uochronos on 02/27/2005 20:35:33
not pushing it may help a bit... the issue is this though. the sub movment is what causes it to cool itself down. once the sub stops moving and power is going threw it it heats up from then on till it moves mroe again.
While not pushing it well help it not heat up as muchy because not as much power well go threw it. the issue here is if your say running it at half power and going below PTF it well over heat it may just take twice as long as with full power. its able to get ride of 500watts of heat easier then it can 1000watts but the VC is still heating up....
I'm having very little luck finding another company that makes something like the Fmods... but i well keep looking... i well see if swez knows also... or if he is reading this he can awnser as well hehe.
Chronos
SeJae on 02/27/2005 23:30:23
Yeah, the Swam, I mean the Swez can help. LOL I have been thinking of getting a box that is tuned to 30hz, but I havent priced one around the city yet. Thanx for all your help U. I really am endebted to you. Thanx, Thanx again.
uochronos on 02/28/2005 01:00:07
ya a box tuned lower would help... you could if you can get your current box apart ad a bit ofi length tuning it lower
Chronos
SeJae on 03/1/2005 11:54:12
I called Ben from Edesigns and gave him the same specs I gave you guys. And I told of my AXT didn't have a SSF. He replied that I will be running at 39hz and a fmod of 30hz will be fine and this configuration would not void my warranty.:) He said that the only thing I should worry about with the 16ov.2 is over powering the sub at low frequencies, but other than that I was good to go. No one else, but ED should know there own products, right.
uochronos on 03/1/2005 12:49:30
yep if you hurt your sub now which hopfully you shouldnt then you can say well you guys told me:)... i looked all over to though and couldnt find anyone who makes a actauly 40hz HP inline filter. other then ones that get wired into your speaker wire not your RCA's and i wasnt sure about noise from them...
Chronos
SeJae on 03/1/2005 13:20:59
I found a SSF on ebay for 25.00. It's made by Harrison Labs or a certified dealer. It looks pretty old. This is irrelevant since I already ordered my 30hz Fmod, oh well.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=14931&item=5752589705
uochronos on 03/1/2005 21:09:49
ya look at that hehe.... funny how things always turn up once you stop searching for them..
Chronos
SeJae on 03/4/2005 10:45:25
Well, I put on the Fmod and I lost all kinds of power. That should'nt happen right?.. All I need to do is put the fmod in between the rca cables and the amp rca input, correct?! What the hell.......
uochronos on 03/4/2005 13:50:11
lost power? i dont understand? are you sure its the right Fmod? 30hz High Pass... make sure its not low pass and that it is 30hz...
SeJae on 03/4/2005 14:40:52
it's a30hz high pass filter. I used to put my deck on 22 and the rearview starts shaking. After putting the fmod on then I dont get any at all, but only at a higher volume.
uochronos on 03/4/2005 17:42:31
hmm that doesnt make any since it shouldnt effect anything above 30hz.... swez, ttocs, anyone? have some ideas on what could be going on here?
Chronos
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