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Thread: Two stereo power amps for Bi-amping or two monoblocks?

  1. #1
    Join Date: Jan 2020

    Location: Sheffield

    Posts: 13
    I'm Evie.

    Default Two stereo power amps for Bi-amping or two monoblocks?

    Hi,

    Realistically, is it worth bi-amping with two stereo amplifiers (one amplifier per hand side), so that there are all the advantages of avoiding cross talk, more power and only one speaker pulling on the power supply or is the money better invested in two monoblocks (one per speaker)?

    LKB

  2. #2
    Join Date: Apr 2009

    Location: Near Saffron Walden, Essex

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    I'm Dave.

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    Or a better stereo amp. It depends on the amps being considered.

  3. #3
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    And the speakers used
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  4. #4
    Join Date: Sep 2017

    Location: Chichester, West Sussex UK

    Posts: 201
    I'm John.

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    Basically as per above to replies.
    I will also add that you are better of spending your budget on ONE stereo amp/pair of Mono Blocs as you will then be buying the best you can afford. Rather than splitting the budget across two amps which will invariably be inferior in both performance and SQ.

  5. #5
    Join Date: Feb 2020

    Location: Clitheroe, Lancs

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    I'm Pete.

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    Ive heard of folk using 1 stereo amp for the treble and another for the bass.

  6. #6
    Join Date: Nov 2011

    Location: Wakefield west yorkshire

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    I'm James.

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    Do you.mean two power amps? Oh aye it's in the title
    Last edited by Pieoftheday; 04-03-2020 at 17:17.
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  7. #7
    Join Date: Jun 2015

    Location: London/Durham

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    I'm Lawrence.

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    If they can be bridged then it's a definite yes.

    If you can pick them up at a bargain price ie the same as an equivalent power/quality monobloc (to one channel of these) then I'd consider it.

    Otherwise I'd go with the "vertical biamp" option mentioned above.

  8. #8
    Join Date: Sep 2013

    Location: North Island New Zealand

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    I'm Chris.

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    Quote Originally Posted by Lekidbongo View Post
    Hi,

    Realistically, is it worth bi-amping with two stereo amplifiers (one amplifier per hand side), so that there are all the advantages of avoiding cross talk, more power and only one speaker pulling on the power supply or is the money better invested in two monoblocks (one per speaker)?

    LKB
    Can be done either way, two stereo amps gives perhaps more flexibility if frequency division or perhaps 2 of the same or similar speaker is at a later point needed.
    I presently use 2x Quad 306 using one channel per amp for each loudspeaker, and there are advantages in perceived audio reproduction - in areas of stereo width and
    better ability to reproduce music.

  9. #9
    Join Date: Aug 2015

    Location: Edinburgh, Scotland

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    I'm Kevan.

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    It depends how you split the signal . An active crossover between the pre amp and power amp makes a lot of difference. I am using a pair of quad33s one driving esl63 the other driving gradient subs with the gradient active crossover. Separating the signal before the amps gives each less to do and downstream passive crossovers in speakers also donít affect the signal as much.


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  10. #10
    Join Date: Jan 2019

    Location: Liverpool

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    I'm Andrew.

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    In my current active system I am using 2 x Quad 405 Mk 1 (Upgraded by Fidele Audio ) for the amplification of a stacked pair of KEF 103 reference speakers . I have tried the one amp for the bass and one for treble and it works with not issues . However I do find that the sound cleans up and improves when you use a single stereo amplifier per side . If you were to replace this with monobloc amps then you would need four in total one for each side covering bass and treble to each speaker.

    With a didgital active crossover you do get the flexibility to use a powerful and controlled monobloc amplifier for the bass which needs to have lots of current . You can then use a much smaller and cheaper monobloc for the treble as there is very little stress or push made on that amplifier. Within the digital C/R you can make adjustments for different amplifier sensitivities or as with the MiniDSP DDRC24 I use it will make all the adjustments automatically through the DSP Dirac Live 2 session.

    Personally and I have no justifaction for this I prefer to have two matched amplifiers as close as possible in output and sound hence the use of as near as possible identicaly set up Quad 405,s . I know others who use a wide mixture and we all seem to get the end result to our individual satisfaction .

    One comment I would make which over my dive in to the active world is that the quality of the amplifier is of much less importance when you use a digital active c/r . Driving passive speakers through a passive c/r is much harder on the power amplifier than it is when driving individual drive units via an active network . I am sure if cost is no object using the very best amplification you can afford then the final audio quality will be improved but you may be susrprised at how little it changes compared with the very high quality results you can obtain from much more modest power amplifiers.

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