VictusMei

Hi, everybody.

I just finished installing a new CD player in my car. While I had the dashboard out, I decided to install the SCOCHE Bluetooth Receiver. It comes with a 12v power cable and installation hardware in addition to a wall wart. As a plus, it supports the handsfree profile and includes a very good microphone. Got mine on eBay for around $35+S&H.

I experience the following issue with both the MS and Widcomm stacks. (I'm using Widcomm now).

When using bluetooth audio, the audio signal coming from the bluetooth receiver is distorted because of clipping, as if the pre-amp volume was simply too high. I've adjusted the audio level knob on the SCOSCHE receiver to no avail. It has no effect on the amount of clipping; it only changes the loudness of the final already-distorted output. (The receiver does not have volume controls normally found on BT headphones.)

This leads me to believe that either the audio is sent from my Axim too loud, or that the SCOSCHE receiver, having no volume controls, plays the received audio a little to high. Interestingly, audio from my phone sounds just fine.

Software volume controls don't work; I tried adjusting the system volume as well as application volume. It's on full-blast at any volume other than zero, and muted when I move the slider to zero.

After setting the pre-amp volume on Pocket Player to -20dB and increasing SCOSCHE receiver's output volume, I can listen to music fine, but now system sounds and sounds from other applications are way too loud in comparison, and are still distorted. My GPS now screams directions at me; and adjusting the volume in TomTom has no effect. Whenever the phone rings through the radio, it damn near gives me a heart attack. :-)

Is there any way to decrease the volume of the audio sent via the A2DP link, or to enable application-level volume controls? I'm frustrated enough to open the TomTom voices in a wave editor and manually decrease their volume by 20dB. :-) The CD player does come with a stereo-to-RCA adapter and a stylish input jack that can be mounted in a convenient location, but no self-respecting geek would go from BT to wired audio.

Thanks in advance for any suggestions.

P.S. For those of you considering buying the SCOSCHE bluetooth receiver, be aware that it takes approximately 32 seconds from power-up until it accepts A2DP connections. This is something they don't tell you on the packaging or in the manual. Hands-free connections, on the other hand, are accepted within 3 seconds.

pinyon

I've found the A2DP issue to be software related. WMP amd Pocket Player exhibit the behavior you describe while CorePlayer will control the volume through software.

VictusMei

What, besides being the best media player,do you think allows TCPMP to control the volume? How can we make WM do the same?

I choose PocketPlayer over CorePlayer for in-car music because it has a much better and prettier ui. I've already set my PocketPlayer's pre-amp to -9 dB (after some testing I found that to be the distortion threshold) and I get perfect, clear, high-quality audio.

The real problem is that I still don't have any control of the system volume, nor TomTom's volume, and until I do, system sounds and TomTom directions as well as whatever else is running, will remain too loud and distorted.

I don't really even need any dynamic volume controls; a registry hack or some other 'hardwired' workaround will do just fine, as long as I get to lower system and application volume levels.

I appreciate your feedback.

Originally Posted by pinyon

I've found the A2DP issue to be software related. WMP amd Pocket Player exhibit the behavior you describe while CorePlayer will control the volume through software.

VictusMei

BTW. The bluetooth receiver works like a beauty, but it's cumbersome to establish the audio connection every time I enter or start the car. I wrote a small SKSchema script that does it automatically every time AC power comes on, so all I have to do is just slide my X51V into its docking mount and wait ~15 sec.

Is there a command-line to tell BTConnManagerCE.exe to establish the audio connection?

pinyon

I really wish I could help you on why but I don't know enough about the internals of the sw preamp and it's interaction with the hw volume to say anything intelligent. I've posted on the Conduits forum but gotten no reply.

eni9ma

Sorry for bring this back from the dead, but i have the same problem with the SCOCHE Bluetooth Receiver. Have you figured out what was the problem? It sounds good when i plug in my pda straight to the aux of my car but when i try to go bluetooth with the widcomm stack it just sounds super loud. i can turn down the volume in gsplayer using preamp adjustment but still sound like doo doo. also i get this nasty click click click once in a while. could someone help me out? thanks in advance.

alantdc

Originally Posted by eni9ma

Sorry for bring this back from the dead, but i have the same problem with the SCOCHE Bluetooth Receiver. Have you figured out what was the problem? It sounds good when i plug in my pda straight to the aux of my car but when i try to go bluetooth with the widcomm stack it just sounds super loud. i can turn down the volume in gsplayer using preamp adjustment but still sound like doo doo. also i get this nasty click click click once in a while. could someone help me out? thanks in advance.

I used to have the clicking noise with my X50v and Logitech Bluetooth headphones. Then after I installed this patch on xda-developers.com, the clicking and skipping went away! YMMV. I'm just saying it worked for me.