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Gear / Technical Help => Playback Forum => Topic started by: Massive Dynamic on January 19, 2025, 05:14:50 PM
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I’ve got an inexpensive Class D amp in my system taking the place of a nicer Class A amp that developed a hum. A job layoff delayed sending it in for repair, and now the amp is at least 20 years old.
If I replace that Class A amp, here’s what I need:
-must drive 4-ohm speakers
-dedicated sub-out or pre-outs
-4+ inputs
Amps from NAD or Arcam might do, but I’m open to recommendations for gear I’ve not found in my initial searches. Budget is ~$700, which is a bit more than the anticipated amp repair costs.
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Which class D amp? I prefer my ice power based diy class d amp to my old hafler and marantz class a amps.
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Which class D amp?
A Panasonic XR-25 that I paid a little over $100 for. It's ok, but it doesn't sound as good as the Primare. And the sub out quit working.
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https://www.ebay.com/itm/396131602569?_skw=icepower&itmmeta=01JJ1STF2H7HNTZYTA46VGT5KQ&hash=item5c3b489089:g:sGwAAOSwfRxniui-&itmprp=enc%3AAQAJAAAA4HoV3kP08IDx%2BKZ9MfhVJKkr%2BCjtgc4uy%2FwHDp%2FXwfkCL8bOaEuP%2FcRIaeLd8nXpLMRAaYGBd8WPQzbSGrYkMLu2WD3a47qI01bgARix6qT8PbMlgLk%2BZ%2B36VISL%2FpqWLzLONUFgCWxqiD5Pp90lAGmHfG9ObXDQeZlQ5128R%2Bf0%2FD9m6CT8nHgyGbI6C0xPgxZ2olthYBdK1yx4idxnCLX%2FNXi6rnCnkjaFf7PeFMJ4gnegkF9y6hQ2iuX2v%2FmPi1BnYT%2BqKNOJfuHWjbe%2F%2BnLdDg6xlvAxt0HtBQR645SC%7Ctkp%3ABk9SR8Tx6bmQZQ
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I used a couple panasonic xr55s for years, the slightly later bigger brother of the xr25. They sounded very good and were flexible enough for my needs. I especially liked their very transparent and particularly useful tone controls. Biggest problem was that the internal power supplies were a bit undersized. They weren't current monsters, but otherwise decent early class D.
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Auction item (https://www.ebay.com/itm/396131602569?_skw=icepower&itmmeta=01JJ1STF2H7HNTZYTA46VGT5KQ&hash=item5c3b489089:g:sGwAAOSwfRxniui-&itmprp=enc%3AAQAJAAAA4HoV3kP08IDx%2BKZ9MfhVJKkr%2BCjtgc4uy%2FwHDp%2FXwfkCL8bOaEuP%2FcRIaeLd8nXpLMRAaYGBd8WPQzbSGrYkMLu2WD3a47qI01bgARix6qT8PbMlgLk%2BZ%2B36VISL%2FpqWLzLONUFgCWxqiD5Pp90lAGmHfG9ObXDQeZlQ5128R%2Bf0%2FD9m6CT8nHgyGbI6C0xPgxZ2olthYBdK1yx4idxnCLX%2FNXi6rnCnkjaFf7PeFMJ4gnegkF9y6hQ2iuX2v%2FmPi1BnYT%2BqKNOJfuHWjbe%2F%2BnLdDg6xlvAxt0HtBQR645SC%7Ctkp%3ABk9SR8Tx6bmQZQ)
How do you manage multiple inputs into this amp?
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I don't mean to speak for grawk, but the item linked is a two channel stereo amplifier only, with no input switching, no volume control, no anything else, just good amplification to drive a pair of speakers. You'd need a preamp with source switching and presumably volume control as well between that and whatever the source components are.
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I don't mean to speak for grawk, but the item linked is a two channel stereo amplifier only, with no input switching, no volume control, no anything else, just good amplification to drive a pair of speakers. You'd need a preamp with source switching and presumably volume control as well between that and whatever the source components are.
Yup.
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I don't mean to speak for grawk, but the item linked is a two channel stereo amplifier only, with no input switching, no volume control, no anything else, just good amplification to drive a pair of speakers. You'd need a preamp with source switching and presumably volume control as well between that and whatever the source components are.
Yup.
That's what I inferred, but I don't think I'm interested in a DIY solution. I'm starting to learn toward getting my amp repaired.
I did a forum search, but did not see any reference regarding George Meyer AV (https://www.georgemeyer-av.com/) in LA which is the authorized service center for Primare. I do see they have used equipment for sale, too.
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That’s not diy, it’s a built amp. But it does require a preamp.
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Yamaha A-S801 fits the bill. I love mine, and the loudness feature is awesome.
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Yamaha A-S801 fits the bill. I love mine, and the loudness feature is awesome.
Thanks for the heads up. I think the watts/features/price of the A-S501 might be perfect for my system and size of room.
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Yamaha A-S801 fits the bill. I love mine, and the loudness feature is awesome.
Thanks for the heads up. I think the watts/features/price of the A-S501 might be perfect for my system and size of room.
Looking over the manual, it looks like the sub out frequency cut-off is 100 Hz. My sub only outputs up to 90 Hz. Is that 10 Hz gap going to be noticeable? Can't say that spec thrills me.
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I think you may be looking at this backwards. The 100hz point is where the slope of the low pass filter begins to attenuate. So, on a graph, if looking at the low frequencies it will be a straight line from 20 - 100 hz then the attenuation slope begins to drop. You should get full range to your sub.
20hz 40hz 60hz 80hz 100hz
_|________|_______|______|______|
| \
| \------LPF 12/18dB/octave (typical)
90hz \
\
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I think you may be looking at this backwards. The 100hz point is where the slope of the low pass filter begins to attenuate. So, on a graph, if looking at the low frequencies it will be a straight line from 20 - 100 hz then the attenuation slope begins to drop. You should get full range to your sub.
20hz 40hz 60hz 80hz 100hz
_|________|_______|______|______|
| \
| \------LPF 12/18dB/octave (typical)
90hz \
\
So, full frequencies thru the speaker outs, but only 100Hz and lower thru the sub out? That'll work. I thought there might be a strict crossover inside the unit that split the frequencies between outputs.
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So, full frequencies thru the speaker outs, but only 100Hz and lower thru the sub out?
I believe that is the case. I think it's sending full range through the speaker jacks all the time, while simultaneously sending a low-passed signal through the sub out. So, you'll never have the 10 Hz "gap" in the signal sent to your speakers.
Also, if/when you get it, make sure to read the manual about the loudness control. Used properly it's amazing...I wish more modern high end amps would have it.