If an amp has the following ratings:
300wrms @ 4ohm (mono)
600wrms @ 2 ohm (mono)
and the gain is set so that it only puts out 300wrms @ 2ohm, will the amp run cooler, draw less amperage, and last longer, than running it at 300wrms @ 4ohm?
Replies (7)
swez on 07/25/2007 14:21:35
If the amp is 2 ohm stable, yes!
Also, this leaves good headroom for high amplitude spikes to avoid clipping. (A 3dB cushion if you will) The system will only be 3dB quieter per channel used as well.
This is how Pro Audio gear is often setup. We know the max RMS a given system or part of a system can handle and calculate "headroom" of 3-6dB as a cushion. This insures we never overdrive very expensive horns and woofers or permit amps to get too hot and fail prematurely.
We are on the right track to a clean yet strong playing system if we follow such basic rules. You are on the right track!
Swez
gearhead on 07/25/2007 15:32:00
And since these are going to be used for my mids and highs, I probably won't get too many high amplitude spikes, correct?
swez on 07/25/2007 17:35:17
That is correct, as long as this is a Class A/B full range amp being used. Class D sub amps are only good up to about 300 Hz.
Swez
Victor on 07/25/2007 18:12:10
just an update...
there are full range class D amps available in the market from many reputed manufacturers now...
COFFEE....
gearhead on 07/25/2007 18:18:58
"there are full range class D amps available in the market from many reputed manufacturers now..."
Yeah, but I'm frugal (CHEAP). I'm only paying $50 - $80 for my high current amps.
swez on 07/25/2007 22:22:42
Victor,
Yes, I have been reading about them a little now and again. They have Class D amplification in very small portable audio devices now, but I have yet to see this topology available in mainstream audio products just yet. For now, I'll stick to Class A/B amplifiers for mids and highs.
Swez
SQLThump on 07/26/2007 11:08:27
I now have heard of a few full range class d's as well. I believe the first one I came across was the JL E1200d or something like that. It was really low powered. What would be the point in such a low powered, single channel full range amp? I have tried to think of usable applications, and the only one I could think of was if one wanted to use a seperate amp for each speaker channel.
300wrms @ 4ohm (mono)
600wrms @ 2 ohm (mono)
and the gain is set so that it only puts out 300wrms @ 2ohm, will the amp run cooler, draw less amperage, and last longer, than running it at 300wrms @ 4ohm?
Replies (7)
swez on 07/25/2007 14:21:35
If the amp is 2 ohm stable, yes!
Also, this leaves good headroom for high amplitude spikes to avoid clipping. (A 3dB cushion if you will) The system will only be 3dB quieter per channel used as well.
This is how Pro Audio gear is often setup. We know the max RMS a given system or part of a system can handle and calculate "headroom" of 3-6dB as a cushion. This insures we never overdrive very expensive horns and woofers or permit amps to get too hot and fail prematurely.
We are on the right track to a clean yet strong playing system if we follow such basic rules. You are on the right track!
Swez
gearhead on 07/25/2007 15:32:00
And since these are going to be used for my mids and highs, I probably won't get too many high amplitude spikes, correct?
swez on 07/25/2007 17:35:17
That is correct, as long as this is a Class A/B full range amp being used. Class D sub amps are only good up to about 300 Hz.
Swez
Victor on 07/25/2007 18:12:10
just an update...
there are full range class D amps available in the market from many reputed manufacturers now...
COFFEE....
gearhead on 07/25/2007 18:18:58
"there are full range class D amps available in the market from many reputed manufacturers now..."
Yeah, but I'm frugal (CHEAP). I'm only paying $50 - $80 for my high current amps.
swez on 07/25/2007 22:22:42
Victor,
Yes, I have been reading about them a little now and again. They have Class D amplification in very small portable audio devices now, but I have yet to see this topology available in mainstream audio products just yet. For now, I'll stick to Class A/B amplifiers for mids and highs.
Swez
SQLThump on 07/26/2007 11:08:27
I now have heard of a few full range class d's as well. I believe the first one I came across was the JL E1200d or something like that. It was really low powered. What would be the point in such a low powered, single channel full range amp? I have tried to think of usable applications, and the only one I could think of was if one wanted to use a seperate amp for each speaker channel.
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