Mono bridging a Yamaha MX-1 - an advice is needed

marne

80s B&W addicted
Hi everyone,
maybe some of you noticed, that I'm interested to mono-bridge my two Yamaha MX-1... shame on me, I hijacked a thread months before and asked there if it would be possible, the answer was yes. Making things sure, I checked back Yamaha and now I'm not sure anymore and think this way I could reach some more of you, especially regarding the details. Maybe some of you could help me another time.

Beeing a carefull guy when it comes to expensive and nice amps ;), I was asking the Yamaha customer support if this is possible (I was not expecting a helpful answer). For example doing this with the inverted outputs of a C-70, C-80 or C-85 preamp and they answered six weeks later that the MX-1 was not intended to work in bridged mode and that I should stay away from this.
But maybe you all know the little guy inside of you who can't give a rest. So I wonder what you think: is it possible to mono bridge a MX-1? I'm asking because this is a dual-mono amp and I'm a bit worried now(with my unknowledge).

Here is the Block Diagramm which may help:


I snatched a C-70 for the inverted outputs, but sadly it was broken and the repair is over 100€ :sigh:.
Anyway I like a clean source and didn't really wanted to have all the distorting circuits a C-70 has (beside it may still be an nice pre).

So I searched the net for a inverter or something similar and stumbled across this (sadly no english version available):
http://www.audiocreativ.com/DE/pd896414204.htm?categoryId=6

http://translate.google.de/translate?js=y&prev=_t&hl=de&ie=UTF-8&layout=1&eotf=1&u=http%3A%2F%2Fwww.audiocreativ.com%2FDE%2Fpd896414204.htm%3FcategoryId%3D6&sl=auto&tl=en

and this is the circuit of this little guy:
http://www.audiocreativ.com/Download/M-42-V.pdf

And now I'm thinking about packing two of these in a small and nice case and using them for the inverted outputs I need. I'm not that solder and e-tech genius but I think I can manage this to work. Beside I like the idea of reducing circuits to the necessary and doing finally some DIY for my hobby. But I'm not sure if this will destroy the MX-1 or if this works in general with this type of amp (the load of my speakers is 8 ohms and I'm not planning to drive them at full power, I just want a bit more juice for my old B&Ws that don't have bi-wiring terminals, that already may have been a solution in a way, but which are always hungry).

So please all you tech guys out there, any help is appreciated .Will I be able to drive my both MX-1 with two of these BTL modules (correct wiring, an on/off switch and maybe an volume pot provided)? Or will this end up in a expensive cloud of smoke? Or maybe you got any idea how I could manage this?

Many, many thanks in advance!

Best regards
Marne
 
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Thank you Martin (a name mate :))! Just because I have two of them and I head fabulous results using mono-bridged PC2002Ms, and my beloved vintage B&Ws only have one pair of speaker terminals...
 
It could be they gave you a true answer, or it could be they merely answered the question you asked.

In the first case I mean there could actually be circuits in the amp that perhaps don't do well with bridging. In the second case the answer merely indicates the amp does not have built-in bridging capability so they're basically saying you can't do it.

My opinion is the second scenario and that the amps probably would be OK with the bridging adapter but I don't know this 100%.
 
I don't think so but again I don't know with absolute certainty. HCA is just a fancy name for sliding bias.
 
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