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

Yeah, I was pretty bummed when neither worked out of the gate. By the time I found out the minidsp could be changed via jumper settings I wasnt in the mood. To be continued!

You found time alignment. You are close. Keep adding cycles till the sound locks in. You will hear less ring/hangover from my testing. It will feel less enveloping but more agile and taught. Less of a wash over the room. The physical impression is a shift from slam to rippled slam. More defined pulses.

Here is an article that explains things better than I can.

https://www.prosoundweb.com/channels/live-sound/time_phase_alignment/#

What I meant with 1/4 wave was you found the relation of changing delay by the corresponding time of an 80hz quarter wave. From peak to null and so on.

1000ms/80Hz= 12.5ms/cycle
12.5ms/cycle X 1.13ft/ms= 16.25ft delay/cycle
16.25/4= 4.0625ft delay per 1/4cycle

Then you added -60 degrees rotation, equivalent to subtracting 1/6 of a cycle (-2.7ft) from your advancement of 14ft. So your actual setting is something like 11.3ft or 8.629ms net.

Its really better to leave the dials at 0 degrees and normal polarity and do exactly as you did by adding AVR channel distance onto your sub physical distance. Adding distance to the subwoofer is really shifting it forward in time relative to the other channels -good. The phase inversion/dial on a sub cannot advance, only stall the signal -not as good. So each setting of AVR distance (advance) vs physical dials (retard) work against eachother. I hope this makes sense.

The oppo setting for phase alignment was 35.3 ft plus one cycle at 60hz. In room it was 52.5ft. The calculated value was 54ft. Pretty close. One drawback of the oppo was being unable to feed analog test signals fhrough its processing. I'll never be totally sure on the oppo but it sounded really great.... Until it met a 0dbfs signal from a test cd. Blorch!

At one point most people were buying minidsp balanced model for the higher output voltage. If you look at the operating instructions for the balanced unit you will see it can do 4v and also adjust input sensitivity

This 800v4 is tight, TIGHT, TIIIIIGHT!!!

And it pulses and drenches the
entire space with infrasonics when it's asked to. I can't possibly see how it can get better. Truly! It's a dream sub for movies and music.

Actually I am finding the extreme lows and infrasonics a bit hard to take. I've seen some descriptions of bass labelled "transparent" and that's a very fitting description for what I hear. BTW, it is not set hot nor cold but rather calibrated at the same level as all other speakers. There is simply no comparison to the 600v2.

Told ya so, ha!...

TAM

Imagine if you upgraded to the v4!

Hopefully the DSP is programmed to filter out "the brown note"

You know...there is such a thing.

The new house to build sound, with simple wiring, reduce the number of equipment principle, searching for a long time, feeling OPPO Blu ray functions, video, audio, network is more balanced, but people are more concerned about the 2 audio performance, and MARANTZ SA8005, NA8005, which is better?

Awesome!