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Thread: Speaker compatibility

  1. #21
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    Just to be clear Bob. I am only advocating 2x speaker rating over nominal amp power for guitar speakers and then really only for VALVE op stages of 50W or more. The "classic" AC30 EL84 stage will never deliver more than about 40W no matter what you do (but, N.B. the very early AC30s used Goodmans 15W 12s and they DID burn out. )

    The guitar amplifier WILL be overdriven and valves tend to "beat" thermal compression that would otherwise protect VCs driven from transistors.

    Many, many years ago we had a pair of KEF Chorals and the tweeters would pop if the tape was dropped early onto the heads in fast wind mode (Quad 303 drive IIRC) a couple of fuses save that situation. That is a case of perfectly match speaker power and PA but a non-standard signal that you would never encounter in a domestic setup.

    In an ideal world, speakers are selected to produce a wanted SPL at X mtrs with some headroom determined by the clients pocket! It then becomes a simple matter to decide upon suitable amplifier power. But of course! With itinerate musos "ideal" never happens.

    Dave.

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    That's my method, run the mixer at nominal output and trim it back at the amp.

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    Quote Originally Posted by ecc83 View Post
    Just to be clear Bob. I am only advocating 2x speaker rating over nominal amp power for guitar speakers and then really only for VALVE op stages of 50W or more. The "classic" AC30 EL84 stage will never deliver more than about 40W no matter what you do (but, N.B. the very early AC30s used Goodmans 15W 12s and they DID burn out. )

    The guitar amplifier WILL be overdriven and valves tend to "beat" thermal compression that would otherwise protect VCs driven from transistors.

    Many, many years ago we had a pair of KEF Chorals and the tweeters would pop if the tape was dropped early onto the heads in fast wind mode (Quad 303 drive IIRC) a couple of fuses save that situation. That is a case of perfectly match speaker power and PA but a non-standard signal that you would never encounter in a domestic setup.

    In an ideal world, speakers are selected to produce a wanted SPL at X mtrs with some headroom determined by the clients pocket! It then becomes a simple matter to decide upon suitable amplifier power. But of course! With itinerate musos "ideal" never happens.

    Dave.
    I leave the guitar amp to the guitarist (except for frequently yelling "turn it down" with some of them!

    PA amps and speakers are a different kettle of fish from domestic stuff (where I'd agree about being more careful with matching the specs). My "double the power" advice is for PA work only with gear designed to be used that way.

    I now only have a small PA anyway and have got around this issue with powered speakers. However, I still work the same way with those--I set up the gain structure on the mixer as I want it then turn up the input attenuators on the speakers to the level I need. For the size of place where I typically use my gear (there are only two or three venues where I tend to work and most of it is musical theatre) this means the knob about half way up for a plenty loud signal and lots of room before clipping.
    That's what I do. I drink and I know things.
    -Tyrion Lannister (and Bobbsy)

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    Off topic, but the keyword appeared and I have a triggered responce : ) I've been want to try mixing on KEF Chorals II. Would that be any fun ? Or, the closely sized C-models from that period

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    I've mixed on a variety of KEF speakers and they've all be good and accurate. I've never mixed on the Chorals but suspect they'd be pretty good. Indeed, I count selling my 104ab models as one of my many lifetime mistakes.
    That's what I do. I drink and I know things.
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    Quote Originally Posted by Bobbsy View Post
    I've mixed on a variety of KEF speakers and they've all be good and accurate. I've never mixed on the Chorals but suspect they'd be pretty good. Indeed, I count selling my 104ab models as one of my many lifetime mistakes.
    The KEF was used in a small office room and monitored speech from another room used for VOs. Everything was mono! The voice was used along with computer controlled 35mm slide presentations. Anyone remember those? !

    Dave.

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    Thanks, so much. They were on my list when I bought my used Tannoy and I'm kinda' out of room, so I put them on the backburner. I'll try to find room for a pair.

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    Quote Originally Posted by rob aylestone View Post
    If you had 600, there are so many much better ones anyway - these will be perfectly happy on your new mixer.
    As chance would have it, rob- the owner of the Peavey speakers wants them back so I'm in need of some new ones. Any recommendations for this mixer ?

    http://www.musiciansfriend.com/pro-a...-powered-mixer
    Lend me your ears

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    If I can refine that question- which speakers would be best for me to use with that mixer for live performance and also for home studio monitors ? Powered speakers ?
    Lend me your ears

  11. #30
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    "If I can refine that question- which speakers would be best for me to use with that mixer for live performance and also for home studio monitors ? Powered speakers ? "

    There seems to be some dislike of powered mixers (implying passive speakers) in HR circles? Not sure why except obviously for a given sum spent the power section takes a large proportion of the build cost and thus fewer (worse?) facilities pre power amps. If a given P mixer has the inouts, routing and facilities you want at a given price I can see the attraction of the "one box " solution. Also, passive speakers are easier to rig as you don't need a power feed.

    Countering that is the "eggs in one basket" reliability issue. Then, a mixer + PA + speakers is very flexible even quite pokey power amps are pretty cheap these days and a spare could be bought . I would think along the lines of pretty high powered passives and a couple of amps which can be "bridged". Thus, for a do down the Mucky Duck just take speakers plus one 200W per ch amp but at the Town Hall bridge both amps for 500W or so per side?

    As a fairly good rule. Good electronics is cheap but spend as much as you can on transducers!
    Dave.

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