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I've been doing some testing of passive DIs recently too, but I was just using the normal output on the rear of my Scarlett solo to drive the input of the DI.  However, I like your idea of using the headphone output to mimic an instrument load.  One question; what type of cable did you use to go from the headphone jack to the DI's input?  A standard "guitar" cable (TS) or a balanced TRS cable?

I have a few cables on hand to test various configurations. Have to keep in mind that the 1/4 TRS jacks on the Scarlett are outputting signals that are not directly compatible with each other without an adapter of some type. The line output being balanced and the headphone output being stereo. Using a guitar cable in the TS headphone output jack would short out the right output, that's not good.

To test the Pro AV1 I used a 1/4 TRS to 3.5mm TRS adapter cable, headphone out to the 3.5 TRS input. I also some other breakout cables to verify the RCA inputs and a 1/4" TRS cable to test those inputs as well.


To test the LTI Blox I used a standard 1/4 TRS to 3.5mm headphone adapter.


The preliminary results of these tests seem to indicate that the audio problem many of us experience is actually with the low quality headphone amps in the playback devices themselves, not necessarily with the DI box (expect for the Rolls DB14 as I noted). I would expect the Scarlett to have a fairly decent headphone amplifier and it does seem to perform well enough.

Matt

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Oh, its definitely overkill.   

However, after having an M20 pole cup fail at a gig, I don't trust the straight poles anymore.  The weight of an X40 on top of a straight pole was able to apply enough torque to break a pole cup. Can you imagine with a UPQ?  These truss assemblies feel solid with a UPQ on top of a 900LFC.

That appears to be an axial type failure and not the result of excessive side loading.  Probably dropped onto a fixed speaker pole that bottomed our or "shanked" and the lower supporting structure won the contest.

Scott,

It it is what it is. I was hoping for the best and expecting the worst. For now the issue seems to be tied to the local I/O but I need to get the console in front of me to be sure.

In the picture of the broken pole cup, is that some kind of dual mode cup?  The M20 mounts on my subs are flush with the speaker cabinet such that the bottom of the air-assisted poles that I use make contact with the metal plate of the M20 mount when screwed down tightly.  IOW - there's no "cup" at the bottom, just a solid metal plate.  I've never felt like my speakers were wobbly on my poles.  I agree that the speakers do look cool mounted on the truss!

Just to be clear, using the headphone out will do the opposite of mimicking an instrument: instruments (especially electric guitars) have a very high output impedance, while headphone amplifiers have a fairly-to-very low output impedance. The goal of using the headphone output was to simulate the common real-word situation of using a DI for the audio from a laptop or cellphone, but won't necessarily tell you much about how it will perform with an instrument.

Got it.  Thanks for the explanation Russ.

Hey gang.  Good to see the regulars still kicking.  Won’t be too long before we see full LED volumes like on a soundstage.  Grimes thing sounds like either a sampling rate error or some sort of tempo mismatch in whatever she’s using for playback.

Good to be seen...

JR

Is that plastic?!  Very frightening if so.  I get that manufacturers are trying to shave weight and cost where they can but this seems to be a very poor place to do that...

May be aluminium, but I'm betting on white metal.
Chris.

I'm sure if a cabinet was rated at 6 ohm some would think their amps would not run it.

You HAVE NO IDEA how many people think this.

I once rated a cabinet for 6 ohms (because that best described the overall load on the amplifier).

I got lots of calls asking where to buy a 6 ohm amplifier, because none of the manufacturers listed it.

I then rated it for 4 ohms and the calls stopped.  The cabinet did not change.


The lack of basic understanding in our industry is astounding sometimes

Hey gang.  Good to see the regulars still kicking.  Won’t be too long before we see full LED volumes like on a soundstage.  Grimes thing sounds like either a sampling rate error or some sort of tempo mismatch in whatever she’s using for playback.

Welcome back Dave, long time!