@number6

I wrote in that thread that I would go home and test the front connectors..
I still haven't! Bad me!!!

I'll try to remember doing so when I get home from work today.

But I admit that the rear connectors compared to my PC has lower output volume.
Not necessary worse sound quality but lower..
Don't know if this is something hardwired into the hardware or something that
DaveAE can change in his CMI8738 driver?!

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@Samwel

Just so you know. I'm using the front (headphone) jack (green) also.
Similar speaker set as Sundown.

#6

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@number6

Ok.

The problem can actually be that the rear connectors are setup as 5.1 ones
by CMI8738 and AHI sends 2ch output to it making it need to "mix" down the
audio. That usually makes Home theater amplifiers output lower volumes
when doing the same.

If I remember I'll mail DaveAE and ask about the CMI8738 setup.

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@number6

Just tested. No difference whatsoever between rear and front connectors.

Tested with AMPlifier and a 192KHz MP3 song, multiple switches back'n'forth.

Two theories, some users have wrong AHI setup or our "beloved" µA1-C
boards are seriously f***ed up giving different output levels/quality with each
board.

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@Samwel

No one ever said the manufacturing process went without incident.

#6

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@Samwel

Quote:

Just tested. No difference whatsoever between rear and front connectors.

Just checked the rear audio-out vs the front audio-out & could hear no difference. Last time I tried the rear connection was with ud1. Quality & volume level from both speakers sounded the same to me.

One problem is the AHI files are in different archives instead of one & not everyone has the same setup.

I tried a set of newer powered speakers on my classic before I got the micro, but I had to crank the volume to max just to get normal listening level so I took them back. My older speakers played much louder then the newer ones at that time. Not sure if thats the same case today or not.

Last edited by sundown on 19-Apr-2006 at 08:19 AM.

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@Samwel

Quote:

Don't know if this is something hardwired into the hardware or something that DaveAE can change in his CMI8738 driver?!

The CMI chip is not aware of rear and front connectors, the signal is split on the analogue side. Therefore it should be the same, unless you use them both at once.

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@Samwel

Quote:

The problem can actually be that the rear connectors are setup as 5.1 ones by CMI8738 and AHI sends 2ch output to it making it need to "mix" down the audio.

No, this is not the case. It doesn't actually know about (real) 5.1. It knows about 3 stereo outputs. The driver just sends the AHI 2 ch sound to one stereo output. There is no mix down involved.

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@DaveAE

btw: Thanks for the new CMI Audio Drivers you had released at 6th April on Os4depot.net, they solved my disortioned audio problem on my µAOne-C

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@cHaOs667

Great to hear!

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@DaveAE

Quote:

Quote: Don't know if this is something hardwired into the hardware or something that DaveAE can change in his CMI8738 driver?! The CMI chip is not aware of rear and front connectors, the signal is split on the analogue side. Therefore it should be the same, unless you use them both at once.

That question was regarding µA1-C sound output volume vs PC sound output volume.

About your answer though.. Yes, it was just as I thought then.
The DA converts the audio and then sends it out to both rear and front connectors for L/R
speakers just the same. Good to hear as I find no difference in output

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@DaveAE

Quote:

Quote: The problem can actually be that the rear connectors are setup as 5.1 ones by CMI8738 and AHI sends 2ch output to it making it need to "mix" down the audio. No, this is not the case. It doesn't actually know about (real) 5.1. It knows about 3 stereo outputs. The driver just sends the AHI 2 ch sound to one stereo output. There is no mix down involved.

Ah.. ok. That would actually make sence as it would be way easier to control the the audio if they're separate.

I didn't mean real mix down with that comment btw.. I meant sending stereo through a 5.1 system setup.
This would actually make the sound have less volume.

Btw as it is now, are the audio connectors at the back of the µA1 set at using 5.1 or stereo+mic+line in?
As AHI doesn't support 5.1 yet and these modes should be changable by software I think.
I recall us having this discussion over email way back?! But I can't remember what you answered me.

Last edited by Samwel on 19-Apr-2006 at 08:30 PM.

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@sundown

Yes, much has happened to the audio driver the last year. Especially for the
µA1-C owners
I think from 5.10-5.11 sometime the audio has been almost faultless.

But update 4 should have fixed most AHI setups as the latest AHI and CMI8738
driver (then) came with the install.

Btw I think there's a CMIboost utility with the CMI8738 driver that boosts the
volume level. You might want to try that if volume is too low.

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@Samwel

Alan told me that to switch between output and input (on the back), it would require extra circuitry which wasn't needed by their 'industrial customers'. So, they are hard-wired to be outputs.

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@Samwel

Quote:

Btw I think there's a CMIboost utility with the CMI8738 driver that boosts the volume level.

No, it boosts the mic input with 20 dB.

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@Samwel

Quote:

Btw I think there's a CMIboost utility with the CMI8738 driver that boosts the volume level. You might want to try that if volume is too low.

That command was for the mic input only. Some of us were complaining about low level recording with the mic input & Dave came out with that command to boost the recorded volume, doesn't work with any other input/output. I've since converted my front mic input connector to stereo line input for recording old records.

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@number6
I'm on a g4 XE and I get a sound like the fan going whup-whup over my speakers,
from my soundblaster live. Quite annoying at times. But no crackling.


painter

@Xenic

Quote:

Sound output from my rear sound connector and the front sound connector on my µA1 is very different. The rear connector sound has one channel at a much lower volume than the other and the sound doesn't seem as clear. The front connector sound is much louder and clearer. I asked about this shortly after I got my µA1 but never got a satisfactory answer. I wish some audio expert would do some measurements on the 2 connectors and tell me why they are so different. Maybe the front ones are not line-level but rather for headphones or something. If A1's were not so hard to get I'd send mine back to have it checked out.

Same here.
The powered L/R speakers I have (similar to sundown), show a significant difference
on one channel versus the other when plugged into the rear light green connector.
(both quality and volume, as you stated)
When moved to the front headphone light green connector, they immediately and clearly
show themselves to be balanced and the difference in clarity is also readily apparent.

@DaveAE

The above has been true on my Micro since update#1/2 through update#4 and your
latest CMI8738 V5.16.
I also wish to thank you for all the work you have done to make this the best audio
system it can be for our Micros. Thanks also to Martin.

#6

Last edited by number6 on 22-Apr-2006 at 08:47 PM.

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@number6

Looks to me like there's a hardware problem on some micros.
You & others have a balance/volume miss-match with the rear connection & Samwell & me are ok. With low volume & noise problems, I would suspect a grounding problem somewhere. Poor/bad grounding could create these kind of problems. Hope I'm wrong.

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@sundown

Quote:

You & others have a balance/volume miss-match with the rear connection & Samwell & me are ok.

From your post #2 in this thread:
Quote:

I never liked the sound off the rear connectors so I use the line-out from the front connector.

From your post #4 in this thread:
Quote:

When I first got the micro, I tried the rear connections, but the audio sounded "dirty", no crackling, but not clean. The audio seems cleaner using the front connector. The rear connectors are hardwired & the front connectors are wired to the sound header port so they are different outputs.

Sounds similar to Xenic and I. What changed this between your earlier posts and what you
have recently stated?
Also, do you know which batch your Micro A1-C was (perhaps date of purchase)
Mine was December 2004 and was professionally built.

#6

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