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AVR300 + Alpha 10P-3

Discussion in 'Arcam Owners' Forum' started by RaceTripper, Oct 29, 2004.

  1. RaceTripper

    RaceTripper
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    I have an AVR300...

    After all this time, my dealer is selling off an ex-dem Alpha 10P-3, so I'm thkning about using it for my front L/C/R channels. I believe this amp produces close to 170 WPC x 3 at 4ohm. Is that correct?? And offloading the amplification for the fronts should give the AVR somewhat more power for the 4 surrounds, right?

    Anyway, I have it setup with the gain buttons on back set to the Normal position. Using an SPL this gives me about the same levels for L/C/R speakers as when they are connected to the AVR.

    The manual says to use this for Arcam amps, but it says to use the Low position for "certain specialist home theater systems."

    Do I have it set correctly?

    Also, is the trigger output on the AVR300 compatable with the Alpha 10P?

    Anyway, I've just started listening, so I'll see if I want to keep this.

    BTW: before anyone suggests I use this setup to bi-amp instead, I have Dynaudios, which aren't bi-ampable. :)

    L/R: Audience 72
    C: Audience 122C
    SS: Audience 52SE
    RS: Audience 62
    Sub30A
     
  2. RaceTripper

    RaceTripper
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    I answered my own question about the trigger. Hooked up a cable for it and it works fine.
     
  3. RaceTripper

    RaceTripper
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    I have another question about the Alpha 10P/3.

    The specs say 100 WPC @ 8 ohm 2 channels driven, 170 Watts @ 4 ohms with 1 channel driven.

    What's the power rating @ 4 ohms with all 3 channels driven?

    Dean
     
  4. Roohster

    Roohster
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    Pretty sure it's as simple as dividing 170 by three?
     
  5. RaceTripper

    RaceTripper
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    No, I don't think so. It doesn't work that way.

    The published rating is:
    100 WPC x 2 @ 8 ohms
    110 WPC x 1 @ 8 ohms
    170 WPC x 1 @ 4 ohms

    I would guess for 3 channels @ 4 ohms it would be around 150+ WPC, but wondered if anyone knows for sure. I imagine someone from Arcam (John, Andrew) could say.
     
  6. Roohster

    Roohster
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    If it put out 170 wpc for one channel, I cant see how it would put out 150 for 3 channels....
     
  7. RaceTripper

    RaceTripper
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    The amp has 3 channels. Any one of them driven alone produces 173 watts @ 4 ohms.

    But when you drive them all, they share the same power rail, so total power available drops as a result. It is not a matter of taking 170 and dividing by how many channels are being driven. For example, this same amp produces 100 Watts @ 8 ohms, but if you drive 2 channels it produces 100 WPC.

    Put another way...I can't take my AVR300 with 100 WPC x 7, and expect it to produce 350 WPC if I only use it for stereo. I actually get about 120+ WPC in stereo.

    I just want to know what each channel produces @ 4 ohms when all 3 channels are driven. If I extrapolate from the 8 ohm ratings, it seems like it would be 150 WPC or so.
     
  8. parrydave

    parrydave
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    Hi dwette,

    Sorry, I have no idea regarding your WPC question. I just wanted to know how it sounds.

    I have quite a similar setup, AVr300 with dynaudio contour LRC, but am using an A85 to drive LR channels. I find that dialogue can sound a little "strained" at times. I'm sure it is partly due to the fact that my centre speaker is sitting on a glass shelf under my TV. I plan to add some isolation etc between the speaker and shelf this weekend - see if it helps. But ultimately I am thinking of more power.

    I use my system for both movies & music and may consider trading in my A85 for p35/3 or similar, giving me essentially the same arrangement as you.

    Any thoughts?

    cheers
    Dave
     
  9. RaceTripper

    RaceTripper
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    Dave...

    I ended up buying the Alpha 10P-3 yesterday. It was too good a deal to pass up (much to the chagrin of my better half) and I really like the improvements it provides.

    Compared to powering L/C/R from the AVR300 I find the Alpha 10 improves the bass a lot, makes the center more detailed, and gives me a richer and warmer sound. And the dynamics are punchier. Not to mention I can play it quite louder than before. My 4 ohm Dyns really seem to benefit from the 10P-3.

    As for the center positioning, I originally had my Audience 122C sitting on the glass shelf of the TV stand, because my TV is a DLP with a top too narrow to accomodate any speaker. And the TV sits in front of a window. But I finally broke down and built a shelf out from the window frame over the TV. I also bought the adjustable Dynaudio center speaker shelf and set the speaker and stand w/spikes on the shelf. The Dynaudio stand allows angling the speaker up or down by 4 or 8 degrees. I have mine angled down 8 deg.

    Let me say that it makes a world of difference. It's as if I upgraded my center speaker. The sound quality improved dramatically. Center dialog is much more clear and the speaker integrates with the mains much better. The second improvement came from adding the 10P amp.

    Apparently, the Dyn center does not like being confined to a TV stand shelf, and works better when it can be out in the open on top of the TV. I definitely recommend switching.

    You can see examples of my center setup here and here.

    If my Audience 122C improved with these changes, I'm pretty sure your Contour C will also.

    Dean
     
  10. steeled

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    Hi Parrydave

    I agree with Dean about centre placement. I use a Mission 75C and have it under the TV on a shelf. This means the speaker fires at your knees and not your ears! I found that lifting the front of the speaker up to fire towards your face rather than at your knees makes a big difference. I used big blobs of blu-tack to do this. (Looks bad but works.)

    I intend to get a Quadraspire centre stand which allows you to this in a pretty way.

    Hope this helps.

    Regards

    David Steele
     

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