I need a new amp to run my Audiobahn ALUM10Q sub with dual 6-ohm voice coils... I have 200.00 US to play with... Does anyone know a reputable online dealer or eBay seller? I don't/can't go over the 200 budget.... I was thinking an Audiobahn A8002T or A8000T(mono) amp... Does anyone else have suggestions? Im not interested in USED amp, must be new w/warranty. Thanks
Replies (8)
uochronos on 08/8/2004 02:35:42
looks like you need an amp that can produce 800-1000watts rms at 2 ohm...
a 200$ budget is hard to come by for a large amp such as this. it has to be a mono amp that is 2 ohm stable and 1000watts. i found one amp on www.thezeb.com
http://www.thezeb.com/detail.aspx?ID=3509
it is a 2 channel amp and if you ran each voice coil to one channel you would get around 300-350 watts rms per VC arounf 700watts to the sub for 169.99$ not a bad deal.
i well continue looking. btw watch buying on ebay if you want a warranty many manufactuerers frown on this and if you buy from a none authorized dealer well not cover the product....
simon on 08/8/2004 03:24:18
you think this amp will run reliably at 700W RMS? Do you think the ALUM10Q will pound harder using this amp or my Earthquake Powerhouse500 (500x1 RMS@4ohm)... Swez told me in a previous string that this amp SHOULD run at 3-ohms mono ... but I paid lots of $$$ for that amp & don't want to hurt it. I was going to use it to run my components & 6x9's (250Wx2@2ohms) and the "new" amp to run my sub... what do u think? Earthquake or Profile ???
uochronos on 08/8/2004 05:28:08
i trust swez very much. i honestly have 0 experience with 6 ohm subs seems like a bad ohmage when all amps are either ma\x at 2 or 4 ohms...
the amp should work though and the differnce in loudness ebtween 500 and 700wats is un noticable to the untrained ear. my last sub setup0 was 500watts and it was extremly loud.
if swez says this amp should work i trust his thought process on it. i would howveer check the amp to make sure it doesnt heat up... i hooked my buddies subs to my 4 ohm stable amp just to test them and they where 2 ohm subs and it heated up extrmly fast withen 2 minutes it was hot to the touch and i dont plan to do that again.
however most 4 ohm subs are around 3.8ohms so if these 3 ohm subs are right around 3 ohms maybe a bit over then they shouldnt put too much strain on the amp. the biggest thing is making sure the amp does not get overly hot. very warm is normal with many amps but exess heat is there enemy...
as for well it put out 700watts it is fused at 90amps even at 12 colt it should be able to push 700watts... i went to www.profileusa.com to get the manual but my computer is acting funny and i couldnt download the manul. it should say in there if the 750watts rms is at 12 volt or 14 colt or what ever. if it is 12 volt or even 14volt i would say this amplifier would be a good choice for the money. if you dont stick with the current one,.
swez on 08/8/2004 10:00:19
That Earthquake amp is pretty stought. But you may do well to monitor its' heat output when bridged to a 3 ohm net load. If it just runs a bit warm when you work it hard, I'd say you will probably be OK. But if it gets hot and goes into thermal protection mode often... a different amp is in order. The safest way to run this amp would be in 2 channel mode. One channel per coil. However, a 6 ohm load per coil will dramatically cut output from the amp, but that is the safest way to use this sub/amp combo if it heats up too much at 3 ohms in bridged mode.
A Class D MONO amp will handle a 3 ohm load with ease. A bit less power than at 2 ohms, but if the amp has enough overall power, it won't be a problem.
Again, monitor the heat output of this Earthquake amp initially. If it gets very hot or goes into thermal protect mode often, use as a 2 channel and run 6 ohms per channel.
The Re number mentioned by Chronos (3.8 ohms) is a DC resistance value. Audio signals are AC voltage. Also, speakers constantly change resistance values based on frequency. If you looked at a CLIO plot of frequency VS impedence, you'd see that the resistance (inductive impedence) changes greatly based on frequency.
At Fs (resonant freq of the sub) the AC resistance can be very high (>60 ohms) and tapers off at frequencies above Fs. The Fs of the 10" Bahn Q series is 26.4 Hz. If you go ported here (recommended for max SPL) Tuning target should be close to 35 Hz. Here's a link to help you determine the box that is right for your application. I would shoot for the "everyday performer" enclosure and 1.5cf internal box volume.
http://www.audiobahninc.com/frame2004.html
Swez
PS When porting, it is important to use a subsonic filter to out frequencies below tuning target. This will protect the sub from going ballistic on you. The filter should be ~30 Hz. Harrison Labs makes an inline filter that will do that job well. About $30.00 a pair and are inline modules with RCA connections on either end for ease of use.
This one: http://www.thezeb.com/detail.aspx?ID=1684
simon on 08/10/2004 02:54:44
So far, the best deal I've found was for a Sony Xplode (pentagon series) XDM1000P5 amp. It's rated at
500 RMS @ 4-ohms mono
900 RMS @ 2-ohms mono
_____which should give me_____
700W RMS at 3-ohms mono... Provided these Sony's live up to their RMS ratings. Has anyone any personal experience or knowledge of these amps. I know Sony's a fairly decent name in the electronics field, and I'm somewhat leaning in favor of these ratings being accurate, but I trust first-hand experience over anything else... Thanks for the help!!
Simon
PS: The amp's selling for $140 US
uochronos on 08/10/2004 03:10:37
if your looking to buy home stuff or a portable cd player otr walkman i would swear by sony but there car audio stuff is not up to par with other amps... mant sony amps are way overrated.. usualy iff it says 1000watts across it it is more like a 300-500watt amp...
if you can find the specs on there web site let me know and i well look at it... i can never find anything on there site though.
uochronos on 08/10/2004 03:19:04
as usualy sonys web site said very very little about this amp.... but it did say one thing that makes me nervous about it. it said "rated power 1x500watts" then it said "1x900at 2ohm" makes me think that 900watts is a max power rating not an rms. meaning if thats true then at 3ohm this amp well only put out 300watts. but since sonys web site isnt bvery helpfull i cant tell for sure
swez on 08/10/2004 13:01:40
I would agree... if this amp is fused below 60 amps, I don't think you'll get what you want here with Sony. They really play games with the numbers and don't give an honest rating.
Something like a JBL 1200.1 would deliver a solid 800 watts RMS at 3 ohms. These can be had off e-bay for under $300.00. Will need to add a SS filter if you go ported. But these are not too expensive either. About $30.00 a pair for Harrison Labs F-MODS at Zeb or Crutchfield.
Swez
Replies (8)
uochronos on 08/8/2004 02:35:42
looks like you need an amp that can produce 800-1000watts rms at 2 ohm...
a 200$ budget is hard to come by for a large amp such as this. it has to be a mono amp that is 2 ohm stable and 1000watts. i found one amp on www.thezeb.com
http://www.thezeb.com/detail.aspx?ID=3509
it is a 2 channel amp and if you ran each voice coil to one channel you would get around 300-350 watts rms per VC arounf 700watts to the sub for 169.99$ not a bad deal.
i well continue looking. btw watch buying on ebay if you want a warranty many manufactuerers frown on this and if you buy from a none authorized dealer well not cover the product....
simon on 08/8/2004 03:24:18
you think this amp will run reliably at 700W RMS? Do you think the ALUM10Q will pound harder using this amp or my Earthquake Powerhouse500 (500x1 RMS@4ohm)... Swez told me in a previous string that this amp SHOULD run at 3-ohms mono ... but I paid lots of $$$ for that amp & don't want to hurt it. I was going to use it to run my components & 6x9's (250Wx2@2ohms) and the "new" amp to run my sub... what do u think? Earthquake or Profile ???
uochronos on 08/8/2004 05:28:08
i trust swez very much. i honestly have 0 experience with 6 ohm subs seems like a bad ohmage when all amps are either ma\x at 2 or 4 ohms...
the amp should work though and the differnce in loudness ebtween 500 and 700wats is un noticable to the untrained ear. my last sub setup0 was 500watts and it was extremly loud.
if swez says this amp should work i trust his thought process on it. i would howveer check the amp to make sure it doesnt heat up... i hooked my buddies subs to my 4 ohm stable amp just to test them and they where 2 ohm subs and it heated up extrmly fast withen 2 minutes it was hot to the touch and i dont plan to do that again.
however most 4 ohm subs are around 3.8ohms so if these 3 ohm subs are right around 3 ohms maybe a bit over then they shouldnt put too much strain on the amp. the biggest thing is making sure the amp does not get overly hot. very warm is normal with many amps but exess heat is there enemy...
as for well it put out 700watts it is fused at 90amps even at 12 colt it should be able to push 700watts... i went to www.profileusa.com to get the manual but my computer is acting funny and i couldnt download the manul. it should say in there if the 750watts rms is at 12 volt or 14 colt or what ever. if it is 12 volt or even 14volt i would say this amplifier would be a good choice for the money. if you dont stick with the current one,.
swez on 08/8/2004 10:00:19
That Earthquake amp is pretty stought. But you may do well to monitor its' heat output when bridged to a 3 ohm net load. If it just runs a bit warm when you work it hard, I'd say you will probably be OK. But if it gets hot and goes into thermal protection mode often... a different amp is in order. The safest way to run this amp would be in 2 channel mode. One channel per coil. However, a 6 ohm load per coil will dramatically cut output from the amp, but that is the safest way to use this sub/amp combo if it heats up too much at 3 ohms in bridged mode.
A Class D MONO amp will handle a 3 ohm load with ease. A bit less power than at 2 ohms, but if the amp has enough overall power, it won't be a problem.
Again, monitor the heat output of this Earthquake amp initially. If it gets very hot or goes into thermal protect mode often, use as a 2 channel and run 6 ohms per channel.
The Re number mentioned by Chronos (3.8 ohms) is a DC resistance value. Audio signals are AC voltage. Also, speakers constantly change resistance values based on frequency. If you looked at a CLIO plot of frequency VS impedence, you'd see that the resistance (inductive impedence) changes greatly based on frequency.
At Fs (resonant freq of the sub) the AC resistance can be very high (>60 ohms) and tapers off at frequencies above Fs. The Fs of the 10" Bahn Q series is 26.4 Hz. If you go ported here (recommended for max SPL) Tuning target should be close to 35 Hz. Here's a link to help you determine the box that is right for your application. I would shoot for the "everyday performer" enclosure and 1.5cf internal box volume.
http://www.audiobahninc.com/frame2004.html
Swez
PS When porting, it is important to use a subsonic filter to out frequencies below tuning target. This will protect the sub from going ballistic on you. The filter should be ~30 Hz. Harrison Labs makes an inline filter that will do that job well. About $30.00 a pair and are inline modules with RCA connections on either end for ease of use.
This one: http://www.thezeb.com/detail.aspx?ID=1684
simon on 08/10/2004 02:54:44
So far, the best deal I've found was for a Sony Xplode (pentagon series) XDM1000P5 amp. It's rated at
500 RMS @ 4-ohms mono
900 RMS @ 2-ohms mono
_____which should give me_____
700W RMS at 3-ohms mono... Provided these Sony's live up to their RMS ratings. Has anyone any personal experience or knowledge of these amps. I know Sony's a fairly decent name in the electronics field, and I'm somewhat leaning in favor of these ratings being accurate, but I trust first-hand experience over anything else... Thanks for the help!!
Simon
PS: The amp's selling for $140 US
uochronos on 08/10/2004 03:10:37
if your looking to buy home stuff or a portable cd player otr walkman i would swear by sony but there car audio stuff is not up to par with other amps... mant sony amps are way overrated.. usualy iff it says 1000watts across it it is more like a 300-500watt amp...
if you can find the specs on there web site let me know and i well look at it... i can never find anything on there site though.
uochronos on 08/10/2004 03:19:04
as usualy sonys web site said very very little about this amp.... but it did say one thing that makes me nervous about it. it said "rated power 1x500watts" then it said "1x900at 2ohm" makes me think that 900watts is a max power rating not an rms. meaning if thats true then at 3ohm this amp well only put out 300watts. but since sonys web site isnt bvery helpfull i cant tell for sure
swez on 08/10/2004 13:01:40
I would agree... if this amp is fused below 60 amps, I don't think you'll get what you want here with Sony. They really play games with the numbers and don't give an honest rating.
Something like a JBL 1200.1 would deliver a solid 800 watts RMS at 3 ohms. These can be had off e-bay for under $300.00. Will need to add a SS filter if you go ported. But these are not too expensive either. About $30.00 a pair for Harrison Labs F-MODS at Zeb or Crutchfield.
Swez
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