chip amp for car sub

Dan2 · 14th November 2007, 09:50 AM

i have a JVC 12" car sub, 750w peak power. if i want to run it off a chip amp, what chip do you recommend??

Paswa · 14th November 2007, 10:49 AM

its 750W peak power, please tell the RMS value.

After I can decide 4 the chip amp.

Dan2 · 15th November 2007, 05:55 PM

just went on website and it says 50-250w RMS

in case this helps the sub is a JVC CS-GD4300

jaycee · 15th November 2007, 07:58 PM

To be honest chip amps really arent suitable for this.. and to get any kind of power you would also have to build a switchmode supply to convert 12V into something higher to run the amp on.

SpittinLLama · 15th November 2007, 11:50 PM

All car amps that are high power have a supply that is higher than the battery voltage (12.6V or 14.4V if engine running). The supply is usually a split supply. If you are making an amp from scratch then the supply will be more trouble than the chip amp. If the supply is already done/available then it doesn't make any difference if it is car or home. What matters then is the same that always matters, what are the supply voltages, desired load impedance and output power range. It depends on what you're trying to do as to whether it is worth the effort. Give me info and you'll get more in return.

-SL

Ipanema · 16th November 2007, 04:52 AM

This classH chip can produce 70W into 4ohms with 14.4V supply.
http://www.nxp.com/acrobat_download/...2Q_ST_SD_2.pdf

goldkenn · 16th November 2007, 10:49 AM

Not really need to consider the power handling of the unit, they just give you a safe operation guildline, even it rated at 10K watts, you will never really pump in 10K watts, you should read the fequency response, effiency and impedance curve.

Consider the low voltage suppply (although you can do a step up but it is too complicated and hard to get real good result), seems only plus amp (CLASS-T/D/H..... whatever) could do the job right, but if you can give at least +/-24V to the chip, I will suggest you consider TDA7293 at BTL.

SpittinLLama · 16th November 2007, 06:08 PM

That's 70W at 10% THD, I'd call 55W as this is the datasheet number at 0.5% THD. Since they don't show graphs it is not possible to tell how good THD and other parameters are. The lifted supply will have some fall out in performance. Since it is for a car, maybe it doesn't matter.

-SL

Dan2 · 18th November 2007, 07:46 AM

i am not going to use this amp in a car, so power supply is not limited to 12 volts.

i was actually looking at the7293 but i don't have a transformer with +-50V out (which is maximum value in the datasheet) but if it will work with +-24V then i can use it. i was thinking of running 2 7293's in parallel mode. maybe i will get one, and if im not happy with it then get a second one.

14th November 2007, 09:50 AM	#1
Dan2 diyAudio Member Join Date: Sep 2005	chip amp for car sub i have a JVC 12" car sub, 750w peak power. if i want to run it off a chip amp, what chip do you recommend??

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14th November 2007, 10:49 AM	#2
Paswa diyAudio Member Join Date: Aug 2007	its 750W peak power, please tell the RMS value. After I can decide 4 the chip amp.

15th November 2007, 05:55 PM	#3
Dan2 diyAudio Member Join Date: Sep 2005	just went on website and it says 50-250w RMS in case this helps the sub is a JVC CS-GD4300

15th November 2007, 07:58 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	To be honest chip amps really arent suitable for this.. and to get any kind of power you would also have to build a switchmode supply to convert 12V into something higher to run the amp on.

15th November 2007, 11:50 PM	#5
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	All car amps that are high power have a supply that is higher than the battery voltage (12.6V or 14.4V if engine running). The supply is usually a split supply. If you are making an amp from scratch then the supply will be more trouble than the chip amp. If the supply is already done/available then it doesn't make any difference if it is car or home. What matters then is the same that always matters, what are the supply voltages, desired load impedance and output power range. It depends on what you're trying to do as to whether it is worth the effort. Give me info and you'll get more in return. -SL

16th November 2007, 04:52 AM	#6
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	This classH chip can produce 70W into 4ohms with 14.4V supply. http://www.nxp.com/acrobat_download/...2Q_ST_SD_2.pdf

16th November 2007, 10:49 AM	#7
goldkenn diyAudio Member Join Date: May 2005 Location: HK	Not really need to consider the power handling of the unit, they just give you a safe operation guildline, even it rated at 10K watts, you will never really pump in 10K watts, you should read the fequency response, effiency and impedance curve. Consider the low voltage suppply (although you can do a step up but it is too complicated and hard to get real good result), seems only plus amp (CLASS-T/D/H..... whatever) could do the job right, but if you can give at least +/-24V to the chip, I will suggest you consider TDA7293 at BTL.

16th November 2007, 06:08 PM	#8
SpittinLLama diyAudio Member Join Date: Apr 2005 Location: In the Wild, Wild West	That's 70W at 10% THD, I'd call 55W as this is the datasheet number at 0.5% THD. Since they don't show graphs it is not possible to tell how good THD and other parameters are. The lifted supply will have some fall out in performance. Since it is for a car, maybe it doesn't matter. -SL

18th November 2007, 07:46 AM	#9
Dan2 diyAudio Member Join Date: Sep 2005	i am not going to use this amp in a car, so power supply is not limited to 12 volts. i was actually looking at the7293 but i don't have a transformer with +-50V out (which is maximum value in the datasheet) but if it will work with +-24V then i can use it. i was thinking of running 2 7293's in parallel mode. maybe i will get one, and if im not happy with it then get a second one.

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