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Old 26th April 2013, 05:20 PM   #1
K12pfc is offline K12pfc  United Kingdom
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Default Newbie idiots advice please

Although I've always had music in my life it's nearly always been via cd, now I've gone back to vinyl and only playing CDs on odd occasions, so a couple of idiot questions regarding a denon amp I've just acquired, it's a pma 350se and as a hi fi novice on hooking it up 2 things surprised me, 1) I had to buy a pre amp to play my turntable and 2) there are no bass or treble controls, why have amps changed this way? Or have I just always bought rubbish that was literally plug and play?
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Old 26th April 2013, 05:27 PM   #2
Mooly is online now Mooly  United Kingdom
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Amps with no tone controls became fashionable many years ago on the basis of "less circuitry... less chance to corrupt the sound". There is no right and wrong on that, just what your ideals are.

I guess not having an inbuilt phono stage suggests this amp was aimed and marketed at the CD user.
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Old 26th April 2013, 05:31 PM   #3
K12pfc is offline K12pfc  United Kingdom
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Well I bought a pre amp and it sounds great so no complaints, I suppose with the one tone option are they saying what you play is roughly what was recorded so this is how it should sound? Just a guess.
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Old 26th April 2013, 05:36 PM   #4
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THat preamp you bought is one specially needed for playing vinyl on a turntable.
The signal from the pickup is far to weak to be fed into a power amplifier.
It needs plenty of preamplification first.
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Old 26th April 2013, 05:41 PM   #5
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LP's come with an emphasis curve defined by the "RIAA" recording industry association or something, long defunct. This keeps the bass from knocking the needle out of the groove. The inverse RIAA curve should be built into a preamp for LP's. 45 RPM records have roughly the same curve, 78 RPM records were different. So what you here should be what was intended. I have a CBS brand stereo test record I bought about 1975 that allows one to test one's system by playing the record and determining if all frequencies in the sweep are at equal volume. If they are, your system is correct.
I test my systems now by playing a hifi recording of a Steinway brand grand piano. I know what those are supposed to sound like, having gone to a concert or two. With that knowledge you can assess your system performance on the basis of how accurate the sound is.
Other people use voice as a calibrator, but having heard Allison Kraus talk to her band on the way to the bus, the voice on stage as presented or recorded, and the voice live, can be quite different.
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Old 26th April 2013, 06:13 PM   #6
K12pfc is offline K12pfc  United Kingdom
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Something I was told was to never turn the amp off, is that correct?
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Old 26th April 2013, 06:23 PM   #7
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No. It is not correct.

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Old 26th April 2013, 07:14 PM   #8
K12pfc is offline K12pfc  United Kingdom
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Thanks
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Old 26th April 2013, 07:17 PM   #9
K12pfc is offline K12pfc  United Kingdom
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Thanks, now I have an annoying buzz, earth problem from the Technics turntable I assume? When connected to the Technics there is absolute silence but the Denon emits an irritating buzz, I've had a play but can't get rid of it, any ideas?
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Old 27th April 2013, 12:04 AM   #10
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Is the ground wire from the turntable connected to the chassis of the preamp? This is necessary to prevent buzz. If connecting to the ground terminal of the preamp still gets buzz, you can try connecting it to a ground on the main amp. One of the chassis screws will likely work as a ground point if it doesn't have a handy ground terminal.
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