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DIN vs RMS

Discussion in 'AV Receivers & Amplifiers' started by Bobby, Jan 30, 2001.

  1. Bobby

    Bobby
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    How does a DIN rating compare to an RMS output rating in real terms of actual sound, I know the techno babble but how would a 25w Din 1%THD at 8ohms be described in an RMS value? Isn't RMS normally 0.01% THD?

    Reason I ask is I'm researching a setup for my parents and most packages quote the power rating in DIN format but I have a Yamaha DSP-A1 which from memory is 100w RMS per channel.
     
  2. Reiner

    Reiner
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    Those values by itself are totally meaningless. In fact you can easier blow a speaker with a less powerfull amp than with an amp which is too powerfull.
    25Watt DIN with 1% is pretty bad in my opinion.
    RMS (Root Means Square) is not normally 0.01%, it should be measured over the whole frequency range (20Hz - 20kHz) until the onset of clipping (which will give whatever THD value).

    A good measurment result would be something like "xx Watt @ 8 Ohms (20Hz - 20kHz) with a THD of less than 0.1%" (below audible).

    Anything measured at 6 (or 4) Ohm or worst, with 1kHz only, is missleading by intention.
    Or just imagine a Ghetto-Blaster with 1000 Watt (PMPO) out of 6 AAA batteries!?
    The THD is probably greater 10% ... ROTFL!

    Sorry, got a bit carried away and I cannot answer your question directly, but you here the specs for the A1 in RMS, and surely I would not partner it with 25 Watt speakers, but anything from 75 - 150 should do as a rough guideline.
    http://www.yamaha.com/cgi-win/webcgi.exe/Specs/?gDSP00010DSP-A1
     
  3. ReTrO

    ReTrO
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    THD means Total Harmonic Distortion by the way.

    Rick


    ------------------
    'I am just a figment of your imagination.'

    Work Site: The Sound Gallery
    Home Site: WD A.V.
     
  4. Bobby

    Bobby
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    No no no, sorry I should of explained my self better.

    I have a DSP-A1 with four 601s2's and a cc6 [​IMG], I was just trying to compare it, as in what I know to a new all-in-one system I'm trying to find for my parents, most of the systems seem to quote it in DIN, for example the Pioneer system quotes
    Power Output Centre 30W (1 kHz, 1% THD, DIN)
    Power Output Front 30W x 2 (1 kHz, 1% THD, DIN)
    Power Output Subwoofer 50W (100 Hz, 1% THD, DIN )
    Power Output Rear 30W x 2 (1 kHz, 1% THD, DIN)

    Which from what your saying sounds rubbish then [​IMG] I've seen a couple of these systems in Dixons so might go and annoy the staff and at any passers by at the weekend [​IMG]
     
  5. Reiner

    Reiner
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    Yep, that sounds like speakers from those mini/midi systems.
    Not all are necessarily (sp?) rubbish, but those seem to be.

    Have fun then ... [​IMG]
     

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