My OMZ v4 (DAC + Headamp) arrive today,
the packaging is very well handled, and it arrive faster than I thought.
I'm very anticipating this unit, since this is my first attempt buying audio equipment which cost more than $800 AUD, this should be very good.
I haven't setup my transport (PC + X-FI soundcard) properly, since I'm waiting for Blue Jeans Cable mini to RCA digital coax cable, and Line Conditioner.
But currently I have AKG K701, Denon D2000, and Soundright PN-2 Powercord.
And then I proceed connecting OMZ with iMod (DAC bypassed), to give the amp a head start. With K701, I need to turn the volume knob to 12 o clock to get decent volume. I'm listening to Eagles - Hotel California
from Hell Freeze Over
unplugged album - Lossless (ALAC).
Initial impression, the bass is punchier than my previous amp, Heed Canamp.
Audio separations is much better, and much clearer... until the vocal comes in, his voices is distorted...
it's like, when you turn volume too high? or the headphone can't handle the frequency, so the bass is breaking up!
What the hell?
Then I properly setup my DVD player to run "Compilation CD" that included inside the box with Coaxial cable. When the first track comes in... oh my God... the clarity, very natural, soo organic, the bass/mid/high is very "natural"... so this is the OMZ signature sound.
Track by track, leave an impressions inside my head... a breathtaking experience, and then suddenly in one track, where the music emphasize high pitch voice... there is a slight "distorted" sound, and I'm beginning to anxious.
Then I change the CD to Eagles - Hell Freeze Over album, switch to track 6 "Hotel California"... opening acoustical instruments is very nicely reproduced, until the vocal comes in... gah! totally distorted... I turn down the volume to 11 o clock, and everything beginning sound normal, but not enough volume for me... so I gradually turn the volume knob to 1 o clock... the voice breaking up again along with the instruments at the background...
I change the connection with optical input, and re-listen the same track.
Yet I found same problem
I figure something wrong with the amp module... then I perform some experiments, like the changing the power board, change the power cord into generic power cord, the problem still persist.
When I bypass the amp, and use OMZ as a stand alone DAC to feed my Xin Supermacro III v6, no distortion problems founded... So I safely assume there is nothing wrong with the DAC.
My Line-Conditioner will arrive tomorrow or the next day, and meanwhile I will conduct several test with different types of music.
Most Jazz & Classical music has no problem, only high pitched voice music and
complicated instrumental music has this problem, like the amp can't handle the frequencies or sumthin...
Currently I'm connecting the OMZ with X-FI Xtrememusic soundcard with inbuilt Creative ASIO, and Foobar 2000 as the player. Yet the problem still continue, I already send an email to Ori regarding to this problem, and I'm wondering anyone here has similar experience like this?