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Yamaha MX-2 bridgeable?

1912 Views 8 Replies 3 Participants Last post by swest, Oct 18, 2004

swest

Discussion Starter · Oct 13, 2004

Can anyone tell me if the Yamaha MX-2 (150wpc) is bridgeable?

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If the two negative output terminals are, or can be, connected together, then yes.

Will the relatively poor low-impedance performance, it won't bridge well; see chart:

http://www.yamaha.co.jp/english/prod.../img/ampfl.gif

For bridging, you want an amp that doubles its power into half the speaker impedance.

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swest

Discussion Starter · #3 · Oct 14, 2004

Quote:

Originally posted by Larry Fine
For bridging, you want an amp that doubles its power into half the speaker impedance.

Ahhh. And so given the data that you cited, this amp is not a good candidate for bridging.

If I did have an amp that was suitable for bridging, is it as simple as placing the two output channels in series?

Thanks for responding.

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swest

Discussion Starter · #4 · Oct 17, 2004

Further question on the MX-2.

The reason I asked the question in the first place is that I recently became the happy beneficiary of a windfall from my B&K fairy in which my Pre/Pro was magically transformed into a Receiver. So now I have excess amplification units that I will either sell, or press into service in some other way.

So, with that in mind, back to the MX-2s. I am keen on increasing my home theater's subwoofer capacity (either by adding subs to the front three channels, and declaring them all Large, or by using dual LFE subs, or both

.) What does the collective wisdom on this forum think about using the MX-2s as subwoofer amplifiers? Even though they are not bridgeable, I could still use both channels (of each) to power individual subwoofer drivers, or a single dual-voice-coil subwoofer driver.

Would their 'relatively poor low-impedance performance' make them, likewise, poor choices for this purpose? Or... ? Thanks for your thoughts.

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swest

Discussion Starter · #5 · Oct 18, 2004

bump - one last shot at this and then I'll let it die...

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goldenear

· #6 · Oct 18, 2004

If you've got the amps, then use 'em. It doesn't make much sense to sell a perfectly capable piece of gear for pennies on the dollar if it will fulfill your requirements.

I've got an extra MX-2 laying around so I hooked it up to a pair of Hsu Research HRSW10's. The subs made some noise, moved some air, LOL. Everthing worked. If the amps are a good match for the requirements of your subs, then use 'em until they blow up, which will probably be a very, very long time if not abused. I've got Yamaha pieces that are 15+ years old that work just as well as they did on day 1.

If your subs are relatively inefficient, present a difficult load, or you need more air moved (due to volume of room), then yeah, you will probably need bigger amps to reach desired output. Otherwise, put 'em to use and get a return on your investment.

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swest

Discussion Starter · #7 · Oct 18, 2004

Point taken. In that case, I guess I would still like to know: How to bridge these amps (if possible); what sort of performance I might expect to achieve; and whether I run the risk of damaging them in the process.

Thanks.

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Larry Fine

· #8 · Oct 18, 2004

SW, bridging requires a phase-splitter, so one amp channel receives its driving signal out of phase with the other. Connect the two negatives together (if not already connected internally), and drive the speaker from the two positive terminals.

I have a simple, one-transistor (per channel) phase-splitter circuit if needed.

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swest

Discussion Starter · #9 · Oct 18, 2004

Quote:

Originally posted by Larry Fine
SW, bridging requires a phase-splitter, so one amp channel receives its driving signal out of phase with the other. Connect the two negatives together (if not already connected internally), and drive the speaker from the two positive terminals.

My guess is, since the amp's documentation doesn't mention it, that there's nothing internal to the amp that facilitates bridging. I have an e-mail in to Yamaha on this subject and I'll see what they have to say.
Quote:

I have a simple, one-transistor (per channel) phase-splitter circuit if needed.

Yes, please.

Can the amp be damaged by using (abusing?) it in this way, or will it simply not perform adequately if it is not suited to bridging? e.g. unacceptable distortion?

Thanks.

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