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#98474 - 05/03/19 06:07 AM 975 vs 976 gain?
Pinball Wizard Offline
Deputy Gunslinger

Registered: 08/02/05
Posts: 9
Loc: Silver Spring, Maryland
I have a 975. I am perfectly happy with it except for one thing. The maximum level that I can get when using HDMI inputs is low. The best I can do to calibrate is about 70. I am going to call this "HDMI gain" although that probably isn't really what this is. Optical/coax/analog/internal tuner are all ok. I am using a Bryston 3BSST set to high gain as a main power amp and some old D75s for the center & surround. I have built a simple opamp booster to give the setup some extra gain & that works fine but it is awkward and I would like to do things right without it.

I note that the 975 spec states the preamp output is "2 volts."
I also note that the 976 spec states the output to be "4 volts." That's about 6 dB difference which is just about what I need. BUT I am not at all sure that is a gain spec. btw, to further confuse the issue, my Bryston's gain switch (perhaps better called sensitivity) is labelled 1 volt/2volt.

So, my question is, will buying a 976 give me 6 dB more output from the HDMI inputs than my 975?


Edited by Pinball Wizard (05/03/19 06:37 AM)
Phlash Phelps Phan Clan #917

#98476 - 05/03/19 11:53 AM Re: 975 vs 976 gain? [Re: Pinball Wizard]
Deromax Offline

Registered: 11/05/07
Posts: 76
Loc: Shawinigan, PQ, Canada
A few thing to consider.

1) Gain and maximum output level are unrelated
2) If other sources are OK, then check at the HDMI source component seting to see if some volume is lowered, late night automatic level control enabled or if downmixing/reencoding may be taking place in the player/TV/server.
3) Using an home made op amp module along multi-thousands dollars equipment is not good!
4) What is this 70 number you are refering to? dB SPL?
5) What volume position are you using when calibrating (the value of the minus dB displayed).
Eric Desrochers

" I hear no highs, I feel no lows, it sounds like crap, it must be Bose "

#98478 - 05/03/19 03:42 PM Re: 975 vs 976 gain? [Re: Pinball Wizard]
Pinball Wizard Offline
Deputy Gunslinger

Registered: 08/02/05
Posts: 9
Loc: Silver Spring, Maryland
Phlash Phelps Phan Clan #917


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