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Old 14th November 2007, 09:50 AM   #1
Dan2 is offline Dan2  South Africa
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Default 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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Old 14th November 2007, 10:49 AM   #2
Paswa is offline Paswa  India
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its 750W peak power, please tell the RMS value.

After I can decide 4 the chip amp.
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Old 15th November 2007, 05:55 PM   #3
Dan2 is offline Dan2  South Africa
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just went on website and it says 50-250w RMS

in case this helps the sub is a JVC CS-GD4300
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Old 15th November 2007, 07:58 PM   #4
jaycee is offline jaycee  United Kingdom
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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.
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Old 15th November 2007, 11:50 PM   #5
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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
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Old 16th November 2007, 04:52 AM   #6
Ipanema is offline Ipanema  Malaysia
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This classH chip can produce 70W into 4ohms with 14.4V supply.
http://www.nxp.com/acrobat_download/...2Q_ST_SD_2.pdf
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Old 16th November 2007, 10:49 AM   #7
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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.
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Old 16th November 2007, 06:08 PM   #8
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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
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Old 18th November 2007, 07:46 AM   #9
Dan2 is offline Dan2  South Africa
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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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