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Amp choice

Discussion in 'AV Receivers & Amplifiers' started by just240, Sep 30, 2003.

  1. just240

    just240
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    I'm in the process of upgrading my old yamaha amp. I've narrowed the choice down to either a Denon 3803 or a Pioneer ax5i. I've recently bought a denon dvd2900 & sony plasma ke32ts2. The pioneer amp is more expensive & does seem to offer a few more options, but is it worth it? Bi-amping for instance? I know the denon is capable of video up switching but I'm already running RGB connections into the plasma from my game consoles. My speaker set-up is Kef Ref 3(F) Kef 100(c) Kef Ref 1(R) + Xbox, Ps2, & GC.
    Any help/advice or alternative suggestions would be appreciated, as i haven't auditioned either amp yet.
     
  2. nathan_silly

    nathan_silly
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    Sorry but I don't think any of them amp's will drive them speakers- especially the Kef Reference 3's!!

    IMO I think you'll either to get something like the HK 8500 AV amp, Onkyo 989... or a decent multi-channel poweramp (at least 150W, high current)

    The Kef's are 4Ohm.. I doubt the Denon 3803 can handle them.
     
  3. just240

    just240
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    I've been told that the Pioneer will switch between 4,6,&8 ohms having said that i've also been told by 2 separate dealer that the denon is also switchable between 6, & 8 ohms but would be fine to run the kefs ....?????????????
     
  4. nathan_silly

    nathan_silly
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    Well if the Denon doesn't have a switch to 4 Ohm... I would say No.

    The Pioneer amp specs look well naff IMO

    100 W + 100 W (8 Ohm, 1% THD, 1 kHz)

    Ok- 100W x 2. Take note that no spec is given when all channels are driven. Also THD spec..that's pretty high. And the 1khz is a test tone at 1khz. Music comprises of full range audio- not at single 1khz tone.

    I have Kef Reference speakers myself (2.2 mains and 200 centre) I would not like to use budget gear with these (I use high quality 2 channel 100W poweramps)

    Even though my amps look on paper (the same) as that Pioneer- they aren't. Specs are..

    100W RMS x 2 into 8Ohm, 0.05%THD, 20hz-20,000khz, at rated output (100%) 45 amperes peak to peak current.

    [edit] Also decent amps double the output every half load change-

    100W into 8Ohm
    200W into 4Ohm

    Now as long as the figures into 4Ohm load is higher then it shows the amp is a good one. I know my amps delivery 170W into 4Ohm.. I see no figures for the Pioneers!

    If the 4 Ohm figure is lower than the 8Ohm figure (ie 80W) AVOID! It shows the amp has low current ability.
     
  5. Jase

    Jase
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    It doesn't have a switch. Kef Reference speakers deserve beefier amplification, ideally a Denon A10SE,A11SR, A1SR etc if you are looking at Denon integrateds.
     
  6. nfordenfield

    nfordenfield
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    IMHO not even a A1SR is enough. My 1SE was not.

    You need power amps to really give them a chance to sing. Let them see 300wtt at 4 ohms of high current and they'll astound you.
     
  7. nathan_silly

    nathan_silly
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    Blimey. Do you think I'll be OK with my three Audiolab 8000PX poweramps? (front three biamped) Two on the 2.2's, one for the 200C

    Room is pretty small so not like I drive them hard.
     
  8. Dimmy

    Dimmy
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    I have to disagree, especially when the A1SR and A1SE's both deliver well over 300 watts into 4 ohms with (around) 0.4% THD.

    Ideally I'd say these are the minimum for the Kef Reference speakers, I doubt anything else of lower cost will be able to drive them properly (maybe an RMB1075 - but I doubt it).

    Certainately wouldn't pair them with a 3803 or an AX5i, as - quite simply - they're not reference amps, and have comparitively poor quality power amplification.

    Nathan - the amps you're using should be OKAY I'd imagine, but - as with most speakers - they'll sing better with something a little more substantial powering them.
     
  9. nathan_silly

    nathan_silly
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    Dimmy- have you owned a pair of Kef 3.3's and a Denon A1SR or 1SE?

    The other Nathan has.

    I'm not so sure the Denon AV Amp's are superior to mine either, if that's what you're also implying.
     
  10. Dimmy

    Dimmy
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    No nathan I'm not - I'm suggesting they'd be the minimum (the Denon AV amps) for the kefs.

    But by the same and all speaker tokens, they benefit from something better :)
     
  11. wookie

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    Nad or HK will have no worries.

    T752 ---- T762 no probs.
    Good with music 2
     

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