surdo
Responses from surdo
| A listening test of two power amps @budjoe Thanks again for your help with this. Yes, the last set of recordings was done with the same cables, speakers (Tannoy), preamp (Quad 34) and recording device. Only the power amps were changed. I wonder if normalising the peak values is th... | |
| A listening test of two power amps budjoe, I normalised the peak of the j-piano and p-piano recordings to -0.3dB (which is what you did?). The above is Ardour’s spectrum analysis of the 1st note of the two recordings. The j-piano recording seems to have a lot more noise. The p-pi... | |
| A listening test of two power amps "I played both the normalized and originals thru 2 different playback apps and my observations hold across both the original and normalized thru both apps. If you want the full analysis values from the originals and the normalized files, I will se... | |
| A listening test of two power amps The problem is in the recordings j-piano.flac and y-piano.flac which are recordings of the Sunfire’s "Voltage source" and "Current source" speaker outs respectively. The piano, in its quieter passages, produces a distinct distortion, especially on... | |
| A listening test of two power amps Listening to these now, I think I’ve found an unpleasant problem and not just a difference, in one of the amps.... | |
| A listening test of two power amps Back with a new test as per erik_squires’s suggestion This time the tannoys high and low frequency terminals were jumper-ed and there was no bi-amping or bi-wiring done. Three recordings were made of three pieces of music with two amps. One amp ... | |
| A listening test of two power amps Thank you very much budjoe for taking the time to listen to the recordings and for the detailed account. Yes, it’s a very good point about environmental sound affecting the recording and the listener’s ability to distinguish between the two. There... | |
| A listening test of two power amps Here’s the switching program that I did in the graphical audio scripting language "puredata". You can jump between up to 3 different audio files and a quick equal-power crossfade of 5 milliseconds is applied when the switch occurs, so no click. ... | |
| A listening test of two power amps "It's am interesting quest, certainly do not be deterred from pursuing your methodology. I do find fault with the logic of searching for what sounds most like live instruments, as if there is some absolute. And there lies the fallacy in the premis... | |
| A listening test of two power amps erik_squires Another doubt that I have (and I’m trying to find a video on measuring voltage at the speaker terminals) relates to my cheap multimeter. I assume I need to use the AC setting. The lowest voltage range for AC is 200V. I wonder how ... | |
| A listening test of two power amps "1. Match level by multimeter instead of SPL. Get a 60 Hz signal and check the output on either speaker. You can get really accurate this way. 2. Consider recording AT the speaker connections. You have to be careful to keep the peak voltages ~ 1V... | |
| A listening test of two power amps "All amps of low distortion, low output impedance and flat response will sound indistinguishable operated below clipping. Decades ago Peter Walker of Quad did a test using RTR tape copies of classical master tapes between two Quad amps - a transis... | |
| A listening test of two power amps "You are your own enemy in this over-technical quest" I think it was pretty simple test and reasonably quick to do, as I mentioned above "Answer is obvious or it isn’t. It’s preference, not better." Sorry, but once again, I don’t think it’s pre... | |
| A listening test of two power amps "surdo; You actually played it well. This forum has it's share of haters and naming your gear will usually open you up to a kick in the nads from at least one or two of them. You're still getting a good taste of that even without brands. I for one... | |
| A listening test of two power amps "Haven’t listened to the files yet, but hope to later today." Great, thanks "I find your wiring configuration of the Sunfire amp confusing. To my understanding, current drive would have the most effect on the lower frequencies. The tweeters shou... |