Douk Audio VU2PRO Precision Edition is Finalized – Stay Tuned!

[Jcrow]

From my personal perspective, I think this is a great suggestion!
However, the current mainstream trigger interface is 12V Trigger, while the VU2 and VU3PRO default to 5V input. If this feature were to be added in the future, what interface and trigger voltage would you recommend we use?

I think the standard 12v 3.5mm would be best. So it would be compatible with other hifi gear

 

[solderdude]

display the accurate level or power.

A few questions pop up as a I see a few missed opportunities

For the VU2.... what voltage level = 0dB ?
I assume it is 1V (so the scale should mention dBV)
When it happens to be dBU it should hit 0dB at 0.775V
I would recommend to at least mention dBU or dBV on the meter (and not only in the manual)

VU2pro:
It is nice to see the 2-4-6-8 ohm load selection for the power scale !
Why not put an A and B scale on the meter (and make the dB scale smaller) ?

About the trigger... that could be an easy fix when it is 5V.
An extra resistor and 5V zener (or a schottky to +5V rail) could have easily make the trigger work on both 5V AND 12V .
When the 5V input can not handle 12V input as well (without destroying the input circuit) you can expect to have them returned.

It is fine if the trigger point (if it were added does not seem to be on these devices) is at 2V (which is the H level input for 5V TTL as well as 3.3V CMOS) for both 5V and 12V but the input should handle 12V as most trigger outs are exactly that.
No problem triggering the 12V at 2V !

Maybe the mentioning of 5V for the trigger is that 5V is the L to H point which would be fine for a 12V input ? In this case 5V trigger point is fine for 12V inputs.

 

[Douk Audio]

I think the standard 12v 3.5mm would be best. So it would be compatible with other hifi gear

Thank you so much for your suggestion about the trigger function.
I just received a reply from the PD; they've decided to add this feature to the final version and support 5-12V wide voltage triggering.

If you're interested in ordering after the product launch, please send me a direct message for a huge discount. Thank you!

 

[Abdo]

Good morning friends, I have a VU3 (no pro) but I always wonder if this type of device might degrade the sound.

Currently I use it with an MA6800 and an Arcam SA45 and two speakers, a BW 804S and a Kef R3 Meta. I use WBC Nakamichi cables.

Since I don't understand much, I would like to know if everything is correct or if you have any suggestions. Thank you.

 

[dualazmak]

Generally speaking, any of VU meters with through-output terminals has possibility of degrading the sound quality especially if the impedance of the VU unit/gear is relatively low (i.e. considerable power-load and distortion to/with amplifiers) and/or if the internal signal circuit/chain would be poorly designed.

My suggestions would be, therefore, you would be better to select well designed VU meter compatible with IEC 60268-17 not only the ballistic behaviors but also the impedance (3600 Ohm), and the VU-meter should be placed in the end of the signal chain; I mean you should never use the through-out signals from the VU-meter unit for any further audio processing.

At least in my case, I use DIY-assembled IEC 60268-17 compatible 12-VU-Meter Array in my PC-DSP-based multichannel multi-SP-driver multi-amplifier fully active audio setup, all of them are placed at the end of the signal chain (ref. #535 and #545 on my project thread, for the latest total system setup, please see #931).