Axiom Home Page Forums General Discussion Home Theater Oppo 103 audio processing

Has anyone used their oppo 103 analog outputs for multichannel audio? I am interested in trying them out because the oppo allows for up to 60ft (or around 45ms) of possible delay between channels. My current AVR maxes out at 30ft.

I am trying to phase align my subwoofers to my mains and I would like to get one more cycle of delay between my subs and mains.

Has anyone tried the outputs? Any drawbacks like flaky onboard volume control etc. ? I don't want to invest in a bunch of RCA cables from blue jeans and reconfigure my rack if it's not worth it from some bug I haven't heard about.

Here is how close I can get with the settings maxed out. I am currently set so they are time aligned, but not fully phase aligned at the MLP (not shown in this plot.) I just need a little more time to play with...

I use it all the time (that way I can watch hockey and listen to SACDs at the same time as my D2v doesn't support simulcast if audio source is HDMI).

Quality is excellent.

get a minidsp 2x4 you gotta have a birthday or valentines or something coming up.

Its Tuesday. Hilariously, Im getting a 2x4. You got a crystal ball over there? But the delay is limited to 7.5ms.

How far away from each other are your subs,thats crazy.Been more than 2 years so i dont recall the maths i used but my subs were only a few feet from the mains and across from each ohter. Now i just keep my subs at the front of the room . GTG

I just use excuses to buy what i want, there's always some BS holiday or special event i cant use to justify. I just ordered a new 6 channel Emotiva amp , 2600 bux no excuse required, its my money.

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Thanks Eric. I will order he cables up and try the oppo out.

Richard, its not really the sub distances I'm correcting for. Their physical location is part of the puzzle, but the bigger issue is the internal latency of the dsp and electronics/driver.

The close mic measured latency from a test impulse to my mains is about 4ms.
The close mic measured latency to subs is about 25ms. The subs dont have a clean impulse, from measuring in room, so its hard to get an exact figure.

Once I add in delay for distance to mlp considering all channels I cant correct for the 25ms. I should be able to get them both time and phase aligned with the oppo and 2x4.

Some might ask "why go through the trouble?"

The reason is when two or more wavefronts converge on a single point in space, in time and in phase, they sum additively, load that point with pressure, and present a cleaner response to neighboring frequencies by reducing out of phase cancellation.

I will post response and phase plots with 'tape measure' setting, 'time aligned' setting, and 'phase and time aligned' setting with impressions later. I can say getting time aligned is the big one to maximise output.

Ill start a new thread so its easier to find later.

"The reason is when two or more wavefronts converge on a single point in space, in time and in phase, they sum additively, load that point with pressure, and present a cleaner response to neighboring frequencies by reducing out of phase cancellation."

This is called Wavefront Acoustics. I can vouch for the reduction in out of phase cancellation. I could not make out the snap of drumsticks on the drumskin or the snapping of strings with my EP600. I don't have that problem anymore with the EP800v4!

So in theory would you want the subs at the same distance for the time alignment instead of like my set up one 15 feet in front with my mains and another beside couch only a couple feet in back of room?

Trevor thats some crayzy azz delay in the dsp what subs are you using. Can you not turn off the dsp and go straight and use the 2x4 to adjust your subs.

Thanks for bringing this up, it something i would have not thought about. I have never hada sub with dsp built in.