Switched Amps. Where Could The Difference Be Coming From?

[voodooless]

So if you are playing at (say) 5W average - tones at that frequency might go up as high as 125W. But you won't hear that in the volume since the null will still be cancelling.

You may hear something when the lower power amp is already near clipping, while the higher power one isn’t.

So the next question should be: are the differences present at all volume levels? Or only when you fail it up to 11?

 

[Trdat]

You may hear something when the lower power amp is already near clipping, while the higher power one isn’t.

So the next question should be: are the differences present at all volume levels? Or only when you fail it up to 11?

The difference was present at low volumes but before I committ to that I need to listen to it again, plus I also need to try with and without eq. I can say it was more notiecable at louder voumes while at lower volumes you could say there was bias or I was hearing things that weren't there. The two most likely reasons so far are,

1. The DSP might have something unique going on with the particular amp it was filtered for. So I will try without eq.
2. The speaker being over excited. So check at lower volumes.

The third option could be due to the Marantz saturating(according to Amir's measurements) at over 4 volts(89 volume) and although I was at around 4 volts(78-80 volume) perhaps the peaks were driving above 4 volts and distortion was coming from the Marantz in particular with the bass peaks, this compounded from the speaker driver distortion this could be what I was hearing.

I am looking into PKanes software. Did I understand right I am using Deltawave?
While I am at it I can perfom a REW sweep.
And I can try and check the voltage at the speaker terminals which I will have to learn but should be easy enough.

 

[voodooless]

And I can try and check the voltage at the speaker terminals which I will have to learn but should be easy enough.

That is the very first thing to try and costs the least amount of efort. If the difference is more than about .5 dB, that is probably the reason.

 

[antcollinet]

2. The speaker being over excited. So check at lower volumes.

And level match - this is probably the most important criteria.

 

[SIY]

Did I understand right I am using Deltawave?

Yes, it's great software and very intuitive.

 

[shion_ca]

Better yet, measure the difference electrically at the speaker terminals. MUCH more accurate than using a mic and trying to capture this stuff against the noisy background of a room and all of the uncertainties of rooms and transducers.

How do you do this and capture the output? Do you need to play a flac that has some constant tone, then set a bolt meter?

 

[Doodski]

How do you do this and capture the output? Do you need to play a flac that has some constant tone, then set a bolt meter?

You can use a sine wave generator as a source and simultaneously use the AC Voltmeter at the speaker or amp terminals and measure the voltage. Set both units being compared at the same voltage level. I set this sine wave generator at 201 Hz and 15% volume output. You may need to increase the volume output and a very slight chance we may need to change the sine wave generator frequency. Do you have a multimeter with AC Volts. If you do what is it. I want to check a couple of specs of the multimeter.

Online Tone Generator - generate pure tones of any frequency

szynalski.com

 

[SIY]

Do you need to play a flac that has some constant tone, then set a bolt meter?

That will work. So will pink or white noise. Keep in mind, accuracy isn't important, consistency is.