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#360811 08/14/16 02:24 AM
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Running a Roland FP-4 into a Bose Tone Match/L1 1S - piano sounds like crap due to the stereo FP-4 / mono TM mismatch... so, do I change the PA or the piano??

pooch #360813 08/14/16 02:34 AM
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What's the application?

Normally Roland units use MONO if you simply plug in only the left channel of the units output.
They sense that and send MONO (usually, for any units I have).
I don't have the FP-4 but do have a couple other Roland pianos.


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pooch #360819 08/14/16 02:52 AM
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Originally Posted By: pooch
Running a Roland FP-4 into a Bose Tone Match/L1 1S - piano sounds like crap due to the stereo FP-4 / mono TM mismatch... so, do I change the PA or the piano??


More information? Exactly what does 'crap' sound like? Too soft? Distorted? Too loud? Can't find a decent level? Too Soft and Too distorted? Too much Hum?

What connectors are you using?

Have you checked the cables? Could you have an open circuit on the earth?

More information is always helpful.


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rharv #360835 08/14/16 04:43 AM
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Playing smooth-jazz/standards..

Have tried ALL the obvious solutions..

Piano sounds very thin and cheap thru Bose - sounded great thru my old PA (JBL Eons)... sounds like it's coming thru a transistor radio instead of a $2000 PA...

pooch #360850 08/14/16 06:20 AM
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Be sure the cable is good. A bad cable connection will sometimes give you a transistor radio quality sound. Swap out the cords.

Bose gear usually sounds good, and so does the piano so there's something going on with the signal chain. If you have a direct box impedance matcher.... try that too.

I know it sounds obvious, but be sure the EQ and the input levels are properly set.

Try running some other thing, such as an MP3 player into the Bose using the same cords.

It's a game of detective.


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pooch #360883 08/14/16 11:08 AM
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Sounds like an impedance mismatch

What is the input impedance of both amps?

I couldn't find out what the output impedance of the piano output is.

The Roland manual states:
"OUTPUT jacks
Connect these to your external speaker system. The sound of the FP-4F can be output from connected audio
equipment or speakers"

but doesn't state anything about the levels.

If the Piano output can actually drive speakers, it will likely be way too high for an Amp input.

In the manual, under connectors it just states: "OUTPUT jacks (L/MONO, R): 1/4-inch phone type"

Can you get a 1/4" Stereo to two-mono adapter and try plugging into the Headphones output?


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pooch #361082 08/15/16 05:32 PM
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Here we go again.....

All stereo pianos sound terrible through a single PA no matter how you fiddle with outputs, inputs, EQ or cables. This is because you are summing the stereo signal to mono and you get phase cancellation. I had to buy a second Bose Compact and keep the channels separate to solve the problem. In a previous thread several people said that a single CPS Spacestation V.3 PA solves the problem but I don't have any personal experience.

This issue applies to stereo piano sounds ONLY. All other instruments sound fine.

Tony

pooch #361196 08/16/16 08:30 AM
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Try using just the mono output from the piano,


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