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"rec out" = "line out"?

Discussion in 'AV Receivers & Amplifiers' started by Freak Machine, Feb 9, 2005.

  1. Freak Machine

    Freak Machine
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    Hey folks, I just got a new amp and the only outputs are the "rec out" and "pre out". I want to hook up my Airhead headphone amp to it, and would really like to be able to get a signal from the amp to my PC for vinyl recording purposes.
    I done some digging around and I think I should use the "rec out" to connect my headphone amp, and most likely the PC aswell? Any and all advice will be greatly appreciated.
     
  2. davehk

    davehk
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    There are two main differences between a pre-amp's "REC out" and "Pre out".

    1) REC Out is not affected by tone controls, Pre Out is
    2) REC Out is not affected by the volume control, Pre Out is

    There may also be differences in level. On consumer gear, Pre Out should be a nominal -10dBv, ie 316mV. Rec Out may be lower - typically 150mV out when line out is giving 316mV. But this is by no means always the case - you need to check the spec of the pre-amp.
     
  3. Freak Machine

    Freak Machine
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    So which of the two would be best for recording to hard disk? I really want as virgin(if that's the right word) signal as possible. But if the "rec out" didn't have the oomph I was after I would use the "pre out"? Sorry if I'm being vague.
     
  4. davehk

    davehk
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    Rec (record) out would be the natural choice. Then you can listen at the same time and adjust the listening level without affecting the recording level. Also, you may wish to adjust the tone controls for listening but you do not want to record the modified signal, since if you play it back over a different system, you may well need different tone control settings
     
  5. Freak Machine

    Freak Machine
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    That's certainly very helpful.

    Another question! Is there a large difference between all the inputs on my amp(phono excluded), is there any physical difference between Tuner, AV/DVD, and MD/Tape? I'm guessing they are just convenient labels for common devices?
     
  6. davehk

    davehk
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    You're guess is almost certainly correct. However it is just possible there are sensitivity differences. But my guess is that they are all nominally -10dBv inputs.

    You certainly won't do any harm trying them out - just remember to turn the volume down so you don't get a nasty surprise if one turns out to be more sensitive.

    But if you can get the specs for the pre-amp, they will tell you for certain - what is the make/model?
     
  7. Freak Machine

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    It's a Cambridge Audio A500. I didn't get a manual with it, I'm afraid. Thanking you.
     
  8. davehk

    davehk
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    See http://www.cambridge-audio.co.uk/pdfs/a500_owners_manual.pdf

    They don't give a figure for the tape output - just give it a try.

    MD/Tuner/CD/AV/Aux/Tape: 250mV : all the same and interchangeable
    Phono (optional board): 1.75mV
    Input Impedance: 47kW
    Speaker Impedance: 6W - 16W
    Power Output: 50 watts rms (8W)
    60 watts rms (6W)
    Pre-Out: 500mV
    Frequency Response:
    10Hz to 60kHz (-3dB points)
    Tone Controls: Bass ±6dB @100Hz
    Treble ±6dB @10kHz
    Channel Separation:
    At 1kHz better than 72dB
    Distortion:
    Less than 0.02% @ 1 Watt
    Signal Noise Ratio (A weighted):
    92dB @ full output power
    Dimensions(mm):
    90(h)x430(w)x300(d)
    Voltage AC:
    As specified on rear panel
    Power Consumption:
    As specified on rear panel
     

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