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Topic: Peavey output. |
Dave Seddon
From:
Leicester, England.
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Posted 18 Feb 2019 8:42 am |
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| I have a Peavey Basic 40 amp which I use for my steel and in my opinion I get a great sound from it. I was however thinking of changing the speaker but having looked at the spec' it says output is 45 watts at 8 Ohms but only 30 watts at 4 Ohms. I don't understand that as usually 4 Ohms would give you a bigger output. Am I missing something???? Cheers Dave. |
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Donny Hinson
From:
Glen Burnie, Md. U.S.A.
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Posted 18 Feb 2019 10:55 am
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Yeah, you're missing the fact that that amp is only designed for maximum power when using an 8-ohm load. Using anything higher or lower is not letting the amp operate efficiently, thus there is a power loss. Amps can be designed so that a lower impedance will deliver more power than with just the stock speaker. But that capability has to be designed into the build, with things like more robust components and a heavier power supply. It just doesn't work for all amps.
An example is my Fender Stage 112SE amp. It's rated @ 118 watts with the stock 8-ohm speaker, but it's capable of 160 watts with a 4-ohm load, and it says so right in the manual. |
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Steven Paris
From:
Los Angeles
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Posted 18 Feb 2019 11:04 pm Re: Peavey output.
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| Dave Seddon wrote: |
| I don't understand that as usually 4 Ohms would give you a bigger output. Am I missing something???? Cheers Dave. |
The power supply is the limiting factor in this case---4Ω loads require more current, and in those cheap Peavy amps, the power transformer just won't deliver enough.
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Emmons & Peavey |
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Dave Seddon
From:
Leicester, England.
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Posted 18 Feb 2019 11:08 pm
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| Thank you both, that clears that up but I tell you what for a cheapo amp I get a great sound out of it on my steel. Cheers Dave. |
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Steven Paris
From:
Los Angeles
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Posted 18 Feb 2019 11:34 pm
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The easiest and best improvement you can do to your Basic 40 is to change out the 4558 opamps to OPA2134s---I did this to my Basic 50 and it IS a noticeable difference, IMO.
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Emmons & Peavey |
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Mike Brown
From:
Meridian, Mississippi USA
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Posted 19 Feb 2019 7:01 am Basic 40
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| Thanks for using our products. |
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Greg Cutshaw
From:
Corry, PA, USA
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Posted 19 Feb 2019 8:37 am
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| The amp will deliver maximum power when the speaker impedance matches the amp's internal impedance. It will deliver less power when the speaker impedance is above or below the amp's internal impedance. There are exceptions in modern amp designs but this is easy to prove using ohm's law and I've proven it many times empirically with live amps. |
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Clyde Mattocks
From:
Kinston, North Carolina, USA
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Posted 19 Feb 2019 9:12 pm
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I have several lower power Peavey amps that I find very satisfactory for certain jobs, two Backstage's and a Pacer. I have put the Backstage's in slightly larger cabinets to accomodate 12" speakers. One of my favorite rigs for the weight is a Backstage Plus with a TT-12 speaker, quite ample for a large venue if miked.
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LeGrande II, Nash. 112, Fender Twin Tone Master, Session 400, Harlow Dobro, R.Q.Jones Dobro |
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