[sdiy] Combined output / headphone jack?

[grant musictechnologiesgroup.com]

Neil,

The Pro-One has a mono-for-stereo-headphones/audio output jack, again 
with the NE5532:

"The AUDIO OUT is a standard stereo phone jack, but it accepts a stereo 
or mono plug,
For single-channel use with instrument amplifiers, a mono cable with 
mono plugs at
both ends should suffice. For playing through both channels of a stereo 
amplifier, you
will probably need a stereo cable with a stereo phone plug at one end 
and two phono
plugs at the other. These will connect to the amplifier AUX or TAPE 
inputs, (To
protect speakers, it is customary t o switch off the amplifier when 
making these
connections.)

Stereo headphones can be plugged directly into the AUDIO OUT jack. The 
headphones
should have a minimum impedance of 600 Ohms,"

GB


------ Original Message ------
>From "Neil Harper via Synth-diy" <synth-diy at synth-diy.org>
To "synth-diy at synth-diy.org" <synth-diy at synth-diy.org>
Date 10/14/2024 3:26:27 PM
Subject Re: [sdiy] Combined output / headphone jack?

>
>
>On 2024-10-14 17:50, brianw wrote:
>>  The Ensoniq SQ-80 is far too old to support balanced TRS. On that model, the headphones would be stereo unbalanced, and the line output would be unbalanced TS connections.
>>
>>  In fact, it's still quite rare today (or so it seems) to find a synth that supports balanced outputs, but I agree that it's worth pursuing. I seem to recall that the Roland Jupiter-6 has balanced outputs, but they're on XLR male jacks, not TRS.
>>
>>  How many modern synths have balanced outputs? I think the Access Virus might. Which of those have TRS jacks for dual-purpose line outputs and headphone outputs?
>>
>>  For balanced, Tip and Ring are opposite polarity. For headphones, that would sound awful. I suspect that there would need to be some sort of manual switch to flip to stereo (unbalanced) for headphones or mono balanced otherwise. The challenge is that there is no way to automatically detect the difference between a headphone plug and a TRS balanced plug.
>>
>>  Brian
>>
>>  p.s. Re-reading your message, I realize that you probably don't expect the SQ-80 to properly support a balanced TRS plug that gets inserted, but you're wondering how that would be "handled." I would expect that the signal would be very faint on the other end of the cable, if it's actually connected to a balanced input. The faint signal would occur for sounds panned to center, and they would get louder as the sounds are panned away from center, but would still be as much as 6 dB quieter than a proper balanced signal.
>
>
>hey Brian, I'm just interested in a mono source.. single 1/4" output
>that is both compatible with unbalanced line-out and stereo headphones.
>
>the case where a user plugs a TRS in and expects to get a balanced
>line-level signal is something I'm not at all worried about. expecting
>that to work on a synth is quite an assumption unless
>documented/labelled as such.
>
>
>
>
>--
>/// Neil Harper
>/// Every Wave is New Until it Breaks
>
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