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1
Audio Hardware / SPDIF to analog conversion and vice versa
Last post by jimhead -
Trying to solve a long analog cable length problem.  My subwoofer is in the front of my family room and the home theatre receiver in the back.  Connecting those two are a 20-30 foot cable terminated by RCA jacks, all in the wall.  Yes, there are lots of electrical noise problems to the point that it's unusable.  It's two-conductor single-ended, looks like coax.

I'm thinking about using analog->spdif and spdif->analog converters in order to use that long cable as a spdif transport. That seems to be the most robust solution given my predicament.

Other options and their cons:
- Run line-level --> Lots of electrical noise
- Run speaker level --> Sound quality is terrible
- Wireless transmitter kits --> Don't like latency problems, powering on/off problems, general flakiness, sound quality
- Cannot run new cables through room

Questions:
- What good quality spdif/analog converters are out there?  Throwing a/d and d/a conversion into the mix can't be good for sound quality, but seems less bad than the other options.  Thinking about getting monoprice ones.
- Are there better options for me?
2
I have some useful/interesting updates available.
Firstly, the expander needed some retweaking -- the thresholds and compensation needed to be fixed:
sos.mp3, nog.mp3, st.mp3, uatk.mp3 (all ABBA -- corrections made after input.)

Fairly noticeable example(s) of noise reduction:
hiss reduction:  carp1970-01-orig.mp3, carp1970-01-exp.mp3 (listen for the his much decreased on -exp version)
rumble/rush reduction: SandG-orig.mp3, SandG-exp.mp3 (listen for less rumble, slight less 'rush' sound
Significant improvement in dynamics:
Original:  SandG02-orig.mp3  (LOTS of compression and some distortion -- UGLY)
Simple pseudo-DolbyA:  SandG02-exp.mp3 (Compression is better -- more listenable)
psuedo-DolbyA and full expander:  SandG02-proc.mp3 (Almost normal sounding -- very listenable)


I have gotten some feedback that the 'decoder' or 'pseudo-DolbyA expander' might not really be DolbyA or some of the files might not be really DolbyA encoded.  I don't necessarily disagree or even have direct knowledge, except:

THE RESULTS SEEM TO BE VERY GOOD!!!  Definitely NOT perfect, and I always accept and apply constructive criticism!!!

Gonna release the psuedo-DolbyA (or whatever it is) SOURCE CODE and additional binaries  when I get enough feedback that I am sure that it does what I want it to do..

John Dyson



3
This is the one that i'm looking at specifically. https://www.genelec.com/studio-monitors/sam-studio-subwoofers/7380a-sam-studio-subwoofer

Thanks for all the responses so far. I appreciate this board a lot.
4
First my Reply #357 and only an hour after posting this from a DAC/Sofware designer without MQA support How to handle MQA
Nobody wants to argue to much against MQA because it also may damage sales of own non MQA products.
5
Seems like more vendors of hard and software that are not certified start to claim MQA sounds better as everything before with their own way of handling it.

Care to clarify?
6
I ran some 96k RMAA tests in the studio I previously worked for.
https://hydrogenaud.io/index.php/topic,96560.msg806718.html#msg806718

Test signal playback and redigitize device:
https://www.rme-audio.de/en/products/multiface_2.php

Cassette recorder under test, using a type I tape with Dolby B enabled:
http://tascam.com/product/cd-a750/

I attached the flac of the sweeping IMD test, notice the 1kHz spike, it is the IMD! Also notice the imperfection of the phase analysis and the nice high frequency roll off.

The subjective sound quality of actual music playback is not problematic at all, it just sounded like what a cassette deck should sound.

It would be possible to improve the result by using hi-end decks and tapes, but that 19kHz pilot tone is just too low to worry about. Just think about the amount of distortion in the whole audible spectrum.
7
3rd Party Plugins - (fb2k) / Re: Linear Phase Subwoofer
Last post by alex955 -
Ok thanks, that's the info i've been missing. Any ideas if this is possible with a secondary soundcard instead of a 5.1 one?
8
What does Windows (device manager) and other ripping applications (e.g. dBpoweramp / EAC/ CUERipper) call it?
9
MP3 - General / Re: Lame 3.100 has been released
Last post by madmax -
Here too, much faster: http://tmkk.undo.jp/lame/index_e.html

with this patch applied, i get an error when i try compile x86


./configure  --host=i686-w64-mingw32 --enable-shared --enable-static
and then "make -j2" leads to a
Quote
gain_analysis.c: In Funktion »filterYule«:
gain_analysis.c:216:5: error: impossible constraint in 'asm'
     __asm__ __volatile__ (
     ^
10
@always.beta: Well, actually, original CaTRoX is pretty much compatible with JScript, you just need to follow this guide to make it work.