D
Deleted member 2348
Guest
TDA7293.BTW, 5 * (2 chipamps by channel). Which?
TDA7293.BTW, 5 * (2 chipamps by channel). Which?
It should also be rack mountable with handlesPower amps aren't supposed to be "cute".
They should reflect a muscular, beefy, mean look.
Something that will scare a speaker into submission. LOL
TDA7293.
Opened up my Linn 2250 amplifier to install a treble active card for my new (old) AV5140s and found this:
...Does anyone has an idea what would be the correct value for this SMD ceramic cap? I will replace the poweramp chip (TDA7293) just in case it was damaged...
Well...one must keep it reasonable. I've been in stores where there's a wall of a dozen or so loudspeaker pairs. You are certainly correct that it is often difficult to pinpoint which speaker is playing in that kind of situation. Two or three pairs is reasonable.I was one of those dealers and can tell you subjectively, that with two and maybe three pairs in the same dem room (unused pairs well separated from the playing pair), you can just about get away with it...
I did forget. The owner is anxious to get it back so it is all packed to go to UPS.Did you forget to run THD tests with different frequency of test tones? Or do you only do that with 2-channel power amps? I really like that test.
You guys are brutal!Frequency Response not flat, not very good distortion performance, and screaming noises coming from the amp....it's a laying down panther!? Is that about AVR's having a low bar? We can give it some slack for coming from year 2000 I guess, but aren't they supposed to be measured with the same bar? Seems expensive to me too for an old product, just doesn't seem viable/sensible.
Ah, ok, I'm not used to this AVR market, I'm probably seeing it more from DAC / headphone Amp perspectives.You guys are brutal!
Distortion and noise at low volumes come near Purifi amplifier reference:
And hugely better than that NAD AVR. It has superb dynamic range as well:
20 bits of dynamic range is very hard to find in an amplifier at full power. And better than 16 bits at 5 watts is also excellent.
It also runs cool. And you can get 5 channels for less than price of the Purifi in stereo in used marker.
You could short cut the terminals of the unused speakers and be done...Sometimes Linn's way was every which way but up. I remember Ivor the Linn Guy telling dealers they needed to have 'single speaker' demos. His idea was that the SPL from the 'active' speaker would somehow cause the unswitched speaker in the room to interfere sonically with the speaker under demo. Thus, the only way to make a valid comparison was to only have one set of speakers in the listening room. You can imagine the pain this was for dealers who had to lug speakers in and out of the room. It made A/B impossible. Just another pseudo-scientific bit of high-end mumbo jumbo. LOL
I have. Edward Cherry, he of nested differential feedback loop amplifier fame, laid his PCBs out like this. He was concerned with ground layout, and had specific intent in mitigating coupled signals in the layout.The power devices at the front and the speaker outputs at the rear. I've never seen that.
If I understand what you are writing, that wasn't it. What Ivor was claiming was that sound waves from the active speaker would penetrate and vibrate the drivers of the unplaying speakers, and even resonate inside their cabinets, causing unwanted sound to pollute the listening environment, causing the loudspeaker under audition to be judged incorrectly from a sonic standpoint.You could short cut the terminals of the unused speakers and be done...
Funny that you mention that, I was playing around with a subwoofer to add some under the 50 Hz the bookshelfs don't play.If I understand what you are writing, that wasn't it. What Ivor was claiming was that sound waves from the active speaker would penetrate and vibrate the drivers of the unplaying speakers
There is no doubt that vibrations at a certain frequency and a certain SPL could cause a passive driver to move. Think of the passive radiator concept. Whether that would be significantly audible when another loudspeaker is playing at normal to loud volumes? I certainly don't think it would mask the overall sonic signature of the loudspeaker under demo.Funny that you mention that, I was playing around with a subwoofer to add some under the 50 Hz the bookshelfs don't play.
It's to big to fit under the desk (legroom) so it sits on my left, on the right is an old floorstander for nostalgic reasons and while playing test tones the woofer in that started to move around at aprox. 40 Hz.