I found a steal on Infinity Reference 12" subwoofers, and am interested in building my own subwoofer for my home theater. The drivers are a massive beast, intended originally to be used in a car audio application. They take 300W RMS, 1200W peak and have a 4 ohm impedance (which may cause problems).
My original thought was to use a car amp to power it, and using an old PC PSU to get the 12VDC to the amp, but I quickly realized that adequate ampres would not be fed to it in this manner. Further, professional DJs I know assure me that trying to convert power to feed into an amp is just a Bad Idea(tm) to begin with - out goes the idea of using a bridge rectifier to get 120VDC and stepping it down massively!
So, understanding that the concept behind this project is cost-effectiveness, can anyone suggest to me a realistic way to power this woofer in a home theater setup? Be it a particularly cheap amplifier that has gained a reputation for being halfway decent, or some homebrewed scheme for driving big woofers like this one, I'd like to hear everything you guys can throw at me. Bear in mind the impedance will likely cause some problems... alternative suggestions welcomed. I really want to make a DIY-project out of this one.
Regards,
Peter Bourgon
My original thought was to use a car amp to power it, and using an old PC PSU to get the 12VDC to the amp, but I quickly realized that adequate ampres would not be fed to it in this manner. Further, professional DJs I know assure me that trying to convert power to feed into an amp is just a Bad Idea(tm) to begin with - out goes the idea of using a bridge rectifier to get 120VDC and stepping it down massively!
So, understanding that the concept behind this project is cost-effectiveness, can anyone suggest to me a realistic way to power this woofer in a home theater setup? Be it a particularly cheap amplifier that has gained a reputation for being halfway decent, or some homebrewed scheme for driving big woofers like this one, I'd like to hear everything you guys can throw at me. Bear in mind the impedance will likely cause some problems... alternative suggestions welcomed. I really want to make a DIY-project out of this one.
Regards,
Peter Bourgon
First: BIG and CHEAP never come together.
I suggest something with multiple integrated amplifier IC's in a bridge configuration. You only need to add a few more components (and supply of course). That will certainly do for a sub-amp.
Look for application notes and datasheets for more information.
I suggest something with multiple integrated amplifier IC's in a bridge configuration. You only need to add a few more components (and supply of course). That will certainly do for a sub-amp.
Look for application notes and datasheets for more information.
Not sure what you consider a big amp, but you might want to check out www.apexjr.com or www.adireaudio.com they have plate amps that'll put out 200-300 watts, which is probably adequate for your 300W RMS sub. They are very resonably priced as well.
I've got an AVA250 from Adire. I really like it.
I've got an AVA250 from Adire. I really like it.
If you want BIG clean reliable power at 4 ohms for not a lot of money, check out QSC's RMX 1850HD. At 4 ohms, it will put out 550 W (FTC) or 600 W (EIA) continuous per channel. Bridged into a single 4 ohm load, it will crank out 1800 W!
I got mine for $455 shipped. I use it in a bass guitar rig with some inefficient speakers (Acme Low B-2).
[Edit: clarified specs.]
I got mine for $455 shipped. I use it in a bass guitar rig with some inefficient speakers (Acme Low B-2).
[Edit: clarified specs.]
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