HRT Music Streamer DAC with Gizmo - voltage issues?

[alphaiii Find all posts View Profile Close alphaiii]

Well, I figured I'd give a shot at starting a new thread, since my previous posts about this issue weren't addressed.
http://www.tweakcityaudio.com/forum/...?t=1935&page=3

The Music Streamer DAC has a 2.25V RMS output. Gizmo has a 3.0V input limit, but I have no idea whether this is RMS or max input.

So I'm hoping someone from TCA can answer this - Can the Gizmo accept 2.25V RMS input without having distortion problems from over-driving the input???

Or is the 3.0V a max input, in which case 2.25V RMS is too high and will cause distortion problems with Gizmo???

Thanks in advance.

[alphaiii Find all posts View Profile Close alphaiii]

:scratchchin: ???????????

[dvenardos Find all posts View Profile Close dvenardos]

It seems like Doug Goldberg is going to be the only one that can answer this.

[alphaiii Find all posts View Profile Close alphaiii]

It seems like Doug Goldberg is going to be the only one that can answer this.

Unfortunately, I think you're right.

I'm not trying to :stirthepot: here... but I feel like this falls within the realm of a technical support question, and someone should be able to answer this. I'm not the only one who has asked for specifics about the input voltage...and I've asked on several occasions now...but the questions are still not addressed.

If the input voltage limit is a known issue, then it would be very helpful for us to know EXACTLY what that limit is, since it dictates what we connect upstream of the Gizmo.

[Mike_TX Find all posts View Profile Close Mike_TX]

Unfortunately, I think you're right.

I'm not trying to :stirthepot: here... but I feel like this falls within the realm of a technical support question, and someone should be able to answer this. I'm not the only one who has asked for specifics about the input voltage...and I've asked on several occasions now...but the questions are still not addressed.

If the input voltage limit is a known issue, then it would be very helpful for us to know EXACTLY what that limit is, since it dictates what we connect upstream of the Gizmo.

alphaiii -

Can you expand on that (bolded) more?
:scratchchin:
I'm a DAC newby...

Thanks.

Mike

[alphaiii Find all posts View Profile Close alphaiii]

alphaiii -

Can you expand on that (bolded) more?
:scratchchin:
I'm a DAC newby...

Thanks.

Mike

It seems that the Gizmo has an RCA input voltage limit of 3.0V, but this could either be 3.0V RMS or 3.0V peak-to-peak max.

Using a device upstream of Gizmo with great that 3.0V output (either RMS or max, depending on what the limit with the Gizmo is) apparently causes distortion problems.

So one would want any upstream device to have an output voltage less than that of the input limit of the Gizmo, OR, have an adjustable output (for example, using the PC as a source - just turn the PC's volume down and the issue is avoided).

A USB DAC like the Music Streamer has a fixed 2.25V RMS output... This is why it's important to know if the 3.0V input of the Gizmo is RMS or max. If it is 3.0V peak-to-peak max input, which I was told works out to about 1.06V RMS...then the Music Streamer wouldn't be a good choice, as it puts out 2.25V RMS, which would over-drive the input and cause distortion.

[Mike_TX Find all posts View Profile Close Mike_TX]

Thanks.
Very helpful explanation.
I was considering a DAC for my Gizmo setup (or another), so I'll watch with interest.

Mike

[skullguise Find all posts View Profile Close skullguise]

FWIW, I had issues driving the Gizmo with several line-level inputs:

- Toshiba SD-4000 DVD
- Shanling PCD3000A
- Pioneer DV-47a

The Shanling's outputs are variable, though, and reach "line level" at full volume. It drove the Gizmo VERY well as I turned the volume down, and used Gizmo as a power amp. The sound was great together.

I had tried some RCA attenuators, I think 6db versions, didn't help.

I don't know the output voltages on the 3 players, but I can't imagine all of them are beyond a semi-standard 2V....

I use one Gizmo now off and on in a secondary system, driven by a passive pre. Interestingly, the pre has outputs I can use for my sub, but it seems to work better driven out of the Gizmo than the passive pre (maybe it doesn't like the long cable lengths; wonder if the Gizmo output is buffered in any way).

[dweekie Find all posts View Profile Close dweekie]

wonder if the Gizmo output is buffered in any way).

It is :thumbsup: