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Absent schematics, does anyone know what type of input topology is used in the Series III mic/line inputs? Is it a three-stage op-amp instrumentation input with output offset servo-control? Single-stage differential input op-amp?

The difference isn't trivial: 3-stage op-amp inputs (or high-quality transformer) offer best common-mode rejection ratio (CMRR). Cheaper product often use single-stage op-amps to achieve a differential input.

With a 3-stage input functioning as an instrumentation amp (not to be confused with an instrument input!) unbalanced sources can be connected directly to the balanced input without tying one side of circuit ground and otherwise affecting circuit CMRR.

Paul
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by SwitchBack on Sat Jan 19, 2019 7:17 pm
These are Presonus’ renowned XMax preamps with some extras to allow electronic gain control (no servo’s). AFAIK XMax pre’s used a balanced first stage built from discrete components followed by a balanced opamp stage. Probably still the case or they wouldn’t be XMax preamps anymore, right? ;)
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by roblof on Sun Jan 20, 2019 11:01 am
If it is similar to the legacy models:

http://forumsarchive.presonus.com/posts ... 14017.page

iMac late 2015, Behringer X-Touch, X-Touch ONE, M-Air mr18, X-Air xr18, x32 with Dante/aes67, x32-rack with Dante/aes67, s16 and sd16 stageboxes, p16 monitor system, TurboSound iQ-speakers, Waves x-wsg with SoundGrid server, Motör 61, BCR-2000, StudioLive 24, FirePod 10, Apogee Ensemble, Alesis HD24, Studio One Pro v4.1.1, Notion 6, NI Komplete 11 Ultimate, Halion 6, Nuendo 8.2, Ableton Live 8 Suite, Reaper 4, misc Line6 gear/software, True Temperament Frets on basses and guitars, Korg Kronos, Roland vk-7, Behringer Deepmind 12, Behringer Neutron, Yamaha 02r.....
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by Skip Jones on Sun Jan 20, 2019 1:25 pm
roblof wroteIf it is similar to the legacy models:

http://forumsarchive.presonus.com/posts ... 14017.page


But with extra Cajun sauce for recallable settings.
:reading:

Skip

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by roblof on Mon Jan 21, 2019 3:31 am
Hehe, I see that you were in that old thread as well 8-) .

Damn, that hand drawn picture was pretty bad quality! I wonder what crappy phone camera I was using back then...?

Skip Jones wrote
roblof wroteIf it is similar to the legacy models:

http://forumsarchive.presonus.com/posts ... 14017.page


But with extra Cajun sauce for recallable settings.
:reading:

iMac late 2015, Behringer X-Touch, X-Touch ONE, M-Air mr18, X-Air xr18, x32 with Dante/aes67, x32-rack with Dante/aes67, s16 and sd16 stageboxes, p16 monitor system, TurboSound iQ-speakers, Waves x-wsg with SoundGrid server, Motör 61, BCR-2000, StudioLive 24, FirePod 10, Apogee Ensemble, Alesis HD24, Studio One Pro v4.1.1, Notion 6, NI Komplete 11 Ultimate, Halion 6, Nuendo 8.2, Ableton Live 8 Suite, Reaper 4, misc Line6 gear/software, True Temperament Frets on basses and guitars, Korg Kronos, Roland vk-7, Behringer Deepmind 12, Behringer Neutron, Yamaha 02r.....

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