2. amps-preamps
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Imaging problem, or lack thereof...any ideas

Not sure what/where the problem is, so I'm not really too sure where to post this, but here goes. I'm using a PS3 to send HDMI to my onkyo 805 receiver, which is playing the music in "direct" mode and sending the pre out to a musical fidelity A5 integrated amp (HT bypass input on A5). When I play music this way I get a great image, but of course I'm using the preamp section of the onkyo receiver so it's lacking a lot of power when compared with the A5's preamp section, especially in the lower freqs.

When I send optical out of the PS3 (2 ch 44.1 khz) to my musical fidelity A3 24 DAC and then to an input on the A5 integrated, I totally lose any image. All sound is put out of both speakers simultaneously and all sound is localized at the center. Overall the sound is much better/open/powerful coming from the preamp section of the A5, but I just can't go without an image...

I also have the same problem when sending 2ch analog out of the PS3. No distinction in the 2 channels.

I don't know if it's the player (doesn't seem like it should be, because it separates the 2 channels when playing out HDMI), or the MF A5 integrated (which also doesn't seem like it should be because it's distinguishing channels fine when received through the HT Bypass input from the receiver). Anybody ever have this problem? If so, how did you solve it?

After typing all that it seems like this might be a little confusing :D
joeshow750
blindjim
3,092 posts
 
rEMEMBER TOO, THE 805 HAS A DIGITAL OUTPUT... FOR TRANSFERING AN AUDIO SIGNAL INPUT BY DIGITAL TO ANOTHER DIGITAL DEVICE.

it's justa a parralel port and won't change it at all, just passes it on. maybe going to Wally world and getting one of their $8 optical links and connecting from there to the to the MF DAC could help... it sure wouldn't seem as though it would but stranger things have happend.

Least ways, so far you know who is and isn't playing well with others.

Lastly, following the holiday weekend, making a call to MF distributor or a MF dealership will enlighten the situation more.

Be well.
kool39
53 posts
 
I had the same problem when using the PS3 as a source. I find its image weak at best, tilted on top and weak bass performance.
joeshow750 OP
6 posts
 
I couldn't find any switch like that anywhere on the DAC Jim. There are only two switches on the assembly; the upsampling 96/172khz switch and the on/off switch. You had me hoping though. I'll also try sending the digital out of the receiver...yeah it doesn't seem like that would have any effect on the signal, but who knows--I'll try anything. I'm a Radio Detection and Ranging systems tech, and I've come across a lot "fix actions" over the years that didn't seem to make sense to me electronically, but worked nonetheless.

Kool39, yeah the PS3 probably isn't the best sounding or imaging source out there, but I know for a fact that it is sending out two separate channels of audio because I can hear them when listening through the 805's DAC and pre, and then through the HT bypass on my 2ch integrated MF A5. And when using the PS3 optical out directly to the MF A3 24 DAC to the MF A5--I think the bass is greatly improved, mostly due to the DAC. Although it doesn't sound very "live" due to the mono/imageless output.

So it has to be either the DAC or the pre section in the MF A5 integrated that is mixing the 2 channels and I think I figured out a way to discern which. I'm going to send the analog out of the MF DAC to the receiver and from receiver to the HT bypass on the MF A5. If I don't get a proper image I'll know for sure that the DAC is the problem, because I know that the receiver when in "direct" mode will send exactly what it is getting on the the HT bypass which will only amplify what it's being fed. I know this because as I said before, when sending digital out of the PS3 through the receiver's dac and pre section I get a proper image. If I do get a proper image, I'll know that the DAC is, in fact, sending out to separate ch's and the pre section of the MF A5 is somehow mixing the ch's in it's preamplification.

We'll see what happens, but it looks like either way I'm gonna have to buy something :/
joeshow750 OP
6 posts
 
Well the MF A5 integrated (preamplifier stage) seems to be the problem. Using the PS3 optical out to the MF DAC to the one of the receiver's analog line level inputs and then out to the HT bypass input on the A5, I was able to hear two distinct channels. But when I took the analog out of the DAC directly into any one of the MF A5's inputs, I lost the two separate channels. I tried swapping the speaker inputs just in case either the amp or speakers' ground and hot leads were mismarked--with no effect. Went through the manual for the A5 and it talks about imaging in there a few times, so I'm thinking this isn't normal for these amps, especially since it's not like this is a bottom of the barrel integrated or anything. Just for good measure I hooked up my Onix SP8 tube integrated amp up and did not have the same problem.

I'll try contacting MF, but I'm going to start looking for a new 2ch integrated...or possibly separates with the pre having a HT bypass.
blindjim
3,092 posts
 
Congrats on fidning the apparent problem. Perhaps there is some simple fix for it. Talking to MF ought to say so or not. Sorry that facet isn't working for you too.

Good luck in the hunt for another int. SET & a good int are the two things I've yet to try. As long as the int has preouts, and main ins, I'd not mind it I don't think. Of course I'd want a tube preamp stage and likely an SS main amp. BAT comes to mind.
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