High Watt PA Amplifier

roots600rr · 4th February 2009, 07:48 AM

Hello forum members,
I am interested in building a pair of two channel amplifiers capable of running a medium size PA system. My high and mid cabinets have an average sensitivity of 104db @ 8ohms and the bass cabinets are around 95db@ 8 ohms. I would like to have some headroom so I have the option of running two parallel cabinets per channel, four cabinets per amplifier. I have looked into the studio 350 amp from silicon chip among others but wasn't sure if they were the right choice. If anyone has any amp design suggestions it would be highly appreciated! -Thank You!

Dan2 · 4th February 2009, 12:05 PM

uhm..... wattage?? ......of the speakers

wg_ski · 4th February 2009, 01:03 PM

We're discussing a pretty big one here... no, it's not class A.

Building a Monster... Class A

roots600rr · 4th February 2009, 07:33 PM

Quote:

Originally posted by roots600rr
Hello forum members,
I am interested in building a pair of two channel amplifiers capable of running a medium size PA system. My high and mid cabinets have an average sensitivity of 104db @ 8ohms and the bass cabinets are around 95db@ 8 ohms. I would like to have some headroom so I have the option of running two parallel cabinets per channel, four cabinets per amplifier. I have looked into the studio 350 amp from silicon chip among others but wasn't sure if they were the right choice. If anyone has any amp design suggestions it would be highly appreciated! -Thank You!

The speakers are rated at 300W

homemodder · 4th February 2009, 08:09 PM

You could post probably buy a new built PA amp for cheaper than building one but but if you want to go the diy way I would also suggest you have a look at a members here called fotios amp, its called dirty harry and well designed. Use search and search for a thread with this title.

and_justice · 5th February 2009, 12:04 AM

I've not had much expirience with building amps yet - but i've built some pretty high end computers, and I would like to suggest TEC cooling if you can afford/power it. I doubt there exists an amp with TEC cooling at this point, but there's always a time for firsts...

-John

P.S. can anybody give me a few website where I can buy reasonsably priced transformers (toriodal or other is fine)? Thanks

Adrculda · 5th February 2009, 01:37 AM

As posted in my Thread...
The reason why im going so big is the low impedance that i will need the amp to drive, while for those that want multiple amps for bi or tri amping is suitable to go with a scaled down version of mine.

Take a look at the schematic that MJL has posted in my thread !!!
hes even got the board layout posted.

John...
Peltier effect is a great heat pump, but your overlooking the fact that some of these monster transistors can trow out as much as 300W !!!
The largest peltier i seen was 80W and this thing would Draw 55A under full load!
If you want to build something "cool" run a water cooling kit from a computer with a custom heat sink (which if you say you are familiar with, if you know what i'm talking about), but instead of water use transformer oil, but i will doubt that you will ever need it that.

I might be doing that myself as i have 2 roomates working as machinists so it wouldn't be hard for me to get a 2" thick chunk of aluminum machined with passages for the "coolant" and then seal it with a .25" thick plate of copper ( guess which side will the transistors will go on).

Click here for cheap transformers

roots600rr · 5th February 2009, 01:49 AM

Quote:

Originally posted by wg_ski
We're discussing a pretty big one here... no, it's not class A.

Building a Monster... Class A

Quote:

Originally posted by Adrculda
As posted in my Thread...
The reason why im going so big is the low impedance that i will need the amp to drive, while for those that want multiple amps for bi or tri amping is suitable to go with a scaled down version of mine....

Click here for cheap transformers

The only reason I didnt take interest in this one was because of the size of the required tranfo!...

Adrculda · 5th February 2009, 02:09 AM

Quote:

Originally posted by roots600rr

The only reason I didnt take interest in this one was because of the size of the required tranfo!...

yes but as i have mentioned you only need 1/4 of what i need !!
in other words you can easily get by with a single 800VA or 1KVA unit to drive both channels !!

your power output id limited by the number of output devices and transformer.
Also keep in mind that if your running highs or mids is a different story than subs where current/voltage control is needed to be on an idusrial level.

roots600rr · 5th February 2009, 05:45 AM

Anyone build this?

300W Subwoofer Power Amplifier http://sound.westhost.com/project68.htm

4th February 2009, 07:48 AM	#1
roots600rr diyAudio Member Join Date: Mar 2008	High Watt PA Amplifier Hello forum members, I am interested in building a pair of two channel amplifiers capable of running a medium size PA system. My high and mid cabinets have an average sensitivity of 104db @ 8ohms and the bass cabinets are around 95db@ 8 ohms. I would like to have some headroom so I have the option of running two parallel cabinets per channel, four cabinets per amplifier. I have looked into the studio 350 amp from silicon chip among others but wasn't sure if they were the right choice. If anyone has any amp design suggestions it would be highly appreciated! -Thank You!

5th February 2009, 12:04 AM	#6
and_justice diyAudio Member Join Date: Feb 2009	cooling I've not had much expirience with building amps yet - but i've built some pretty high end computers, and I would like to suggest TEC cooling if you can afford/power it. I doubt there exists an amp with TEC cooling at this point, but there's always a time for firsts... -John P.S. can anybody give me a few website where I can buy reasonsably priced transformers (toriodal or other is fine)? Thanks

5th February 2009, 01:37 AM	#7
Adrculda diyAudio Member Join Date: Jan 2009	As posted in my Thread... The reason why im going so big is the low impedance that i will need the amp to drive, while for those that want multiple amps for bi or tri amping is suitable to go with a scaled down version of mine. Take a look at the schematic that MJL has posted in my thread !!! hes even got the board layout posted. John... Peltier effect is a great heat pump, but your overlooking the fact that some of these monster transistors can trow out as much as 300W !!! The largest peltier i seen was 80W and this thing would Draw 55A under full load! If you want to build something "cool" run a water cooling kit from a computer with a custom heat sink (which if you say you are familiar with, if you know what i'm talking about), but instead of water use transformer oil, but i will doubt that you will ever need it that. I might be doing that myself as i have 2 roomates working as machinists so it wouldn't be hard for me to get a 2" thick chunk of aluminum machined with passages for the "coolant" and then seal it with a .25" thick plate of copper ( guess which side will the transistors will go on). Click here for cheap transformers __________________ Regards, Adrian

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4th February 2009, 12:05 PM	#2
Dan2 diyAudio Member Join Date: Sep 2005	uhm..... wattage?? ......of the speakers

4th February 2009, 01:03 PM	#3
wg_ski diyAudio Member Join Date: Oct 2007	We're discussing a pretty big one here... no, it's not class A. Building a Monster... Class A

4th February 2009, 08:09 PM	#5
homemodder diyAudio Member Join Date: May 2006	You could post probably buy a new built PA amp for cheaper than building one but but if you want to go the diy way I would also suggest you have a look at a members here called fotios amp, its called dirty harry and well designed. Use search and search for a thread with this title.

5th February 2009, 05:45 AM	#10
roots600rr diyAudio Member Join Date: Mar 2008	Anyone build this? 300W Subwoofer Power Amplifier http://sound.westhost.com/project68.htm

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