400W into 8 Ohm

minniew · 21st September 2007, 01:37 PM

Hi Guys I need your input, Please

I need to build a amp capable of delivering 400W into 8 ohms, to drive 15" subs for live PA use. This will only drive 8 ohm as I shall be building the amp into the speaker.
Does anyone have such designs handy?
I do have a circuit for 800W into 4 ohm. Can I use this and just half the amount of output transistors, as the added current for 4 ohm won't be needed.
Thankyou.

ashok · 21st September 2007, 01:44 PM

Better look at classD modules. Less experimentation and easy to implement . With a smps power supply it will be much lighter and not require huge heat sinks. Surely will withstand a beating for PA use !
Some commercial PA amps are incredibly inexpensive for the power they deliver compared to DIY or commercial Hi-Fi amps.
You need to use Google and spend some time on the Net.

minniew · 26th September 2007, 02:00 PM

Thankyou for responding. I shall check on the web and see what I can find.

gni · 26th September 2007, 11:37 PM

Coldamp makes Class D modules. . . easy to setup exactly what
you want. . .with ability to mod the setup.

21st September 2007, 01:37 PM	#1
minniew diyAudio Member Join Date: Sep 2006	400W into 8 Ohm Hi Guys I need your input, Please I need to build a amp capable of delivering 400W into 8 ohms, to drive 15" subs for live PA use. This will only drive 8 ohm as I shall be building the amp into the speaker. Does anyone have such designs handy? I do have a circuit for 800W into 4 ohm. Can I use this and just half the amount of output transistors, as the added current for 4 ohm won't be needed. Thankyou.

21st September 2007, 01:44 PM	#2
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Better look at classD modules. Less experimentation and easy to implement . With a smps power supply it will be much lighter and not require huge heat sinks. Surely will withstand a beating for PA use ! Some commercial PA amps are incredibly inexpensive for the power they deliver compared to DIY or commercial Hi-Fi amps. You need to use Google and spend some time on the Net. __________________ AM

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26th September 2007, 02:00 PM	#3
minniew diyAudio Member Join Date: Sep 2006	Thankyou for responding. I shall check on the web and see what I can find.

26th September 2007, 11:37 PM	#4
gni diyAudio Member Join Date: Sep 2006	Coldamp makes Class D modules. . . easy to setup exactly what you want. . .with ability to mod the setup.

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