I echo that experience - the output of the 286A is not balanced audio - true TRS on that 1/4" plug - but is unbalanced high level (0-+4 dB) only. In most installs that's not a killer, and some consoles appreciate the native unbalanced high level signal for insert patch connections. But if you're counting on leaving the shield open you'll be surprised.
Jim "Turbo" Turvaville
SBE Certified Radio Engineer
Turbo Technical Services
From: Ron Huckeby <email@example.com>
To: 'CRTech' <firstname.lastname@example.org>
Sent: Monday, November 6, 2017 5:02 PM
Subject: RE: [CRTech] arrakis 12k series issues
I was talking about the “output” of the 286A. I have not totally researched them, but experience based evidence is the output is unbalance. I fed the output into and Axia IQ core with TRS, no shield connection and got “nothing”. Switching to a premade StudioHub cable with shield cleared up the problem. I am going to do research this week as I have about a dozen 286A’s going into 5 new studios with Axia studio cores.
Ron Huckeby, CBRE
From: Mark Croom [mailto:email@example.com]
Sent: Friday, November 03, 2017 8:40 PM
To: CRTech <firstname.lastname@example.org>
Subject: Re: [CRTech] arrakis 12k series issues
I'm a little confused here --
I've never had an issue using Tip/Ring into an electronically balanced input with either the 286A or the 286s. I rarely connect grounds on balanced line level gear.
Is this something unique to the original 286 that I haven't encountered yet? I the INSERT jack is unbalanced, but the TRS output, at least on the more recent ones, is electronically balanced and if you put that balanced signal on the balanced inputs of a console, I have never failed to get audio through.
So I'm having a little trouble getting my head around this issue.
That said, if the mods on the Arrakis board have anything to do with patch points then I would definitely remove them, put everything back to factory if possible, and THEN use a signal generator and tracer to see what's coming through, or where it's getting lost.
On Mon, Oct 30, 2017 at 12:53 PM, Ron Huckeby <email@example.com> wrote: