MJA Pro 50 - high and low level connections


Active Member
This is probably a stupid question... so please forgive my ignorance :)

I suppose I have a rather unusual setup which originated from my desrire to keep my hi-fi and home cinema systems in some way separate. Let me explain...

My main stereo amp is an old Leak valve amp. I have my turntable connected directly to the valve pre-amp input which in turn powers my Ruark Crusader front speakers. I have just connected my MJA Pro 50 directly (via the high-level connection on the sub) to the valve amp speaker outputs to add a bit of bass weight to the music. Sounds wonderful (untouched by transistors - except the sub!) and I don't want to touch this setup if possible!

I also have a Yamaha DSP-E492 which acts as switch for all my other sources - DVD, CD, VCR etc etc. The main speaker line-level output from this goes into a pre-amp input of the valve amp. The rest of the speakers are powered by the Yamaha's internal amps. There is also a low-level (filtered) output from the Yamaha to the MJA via phono lead to provide the 5.1 sub output. (Still with me? :D )

So basically I need to have both the low-level and high-level inputs to the sub connected at the same time. But the question is, what happens at the sub end when both inputs are connected and both are receving a signal, for example when I play a DVD or CD? Am I risking damage to the sub with this setup and is there internal switching or will both high-level and low-level inputs go through the sub's amp resulting in a bit of a mix-up?
Any help/suggestions gratefully received!

Member 14718

Active Member
The high level and the low level inputs are independant of each other, thats why they have individual volume controls. If you feed your Hi-Fi amp into the high level input and the proccesor to the low level input and played both peices of equipment at the same time you would get a mix of bass from both sources.

There is no switch, between the two, but perhaps you can use the volume controls to switch between sources.


Active Member
Thanks for the info Dan (once again)...!

So I'm not going to cause any damage to the sub by having both connected then? That's fine with me - as you say I can use the volume controls to effectively switch between high and low level inputs.

Dom H

i think u need to set the sub to off on the amp when you use the high level.

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