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New Slim Devices Transporter - Volume Issues With My Head Amps - Please Help

post #1 of 10
Thread Starter 
I have tried the Transporter connected to two of my headphone amplifiers, and in both cases, I have to nearly maximize the volume setting for an adequate playback level in my headphones.

The Transporter offers attenuation settings, but they require opening up the unit and changing jumpers. Of more concern, they mention that the attenuation is currently set to 0 db as a default, and you can change this to -10, or -20. These settings would, I am certain, lower the volume level even further.


Previously, these amplifiers required that the volume be set, for the loudest reproduction wished for, at perhaps 1/4of the maximum setting for both of my cd players. When using the Transporter, I am required to turn the volume setting up to at least 3/4ths of max volume for even adequate listening. What is the answer here? I can't believe this isn't a workable situation.

It does improve just abit when the Transporter volume output is set to max, but then you get a certain degree of distortion until you back that down to 60-70%.

The amplifiers in question are my Ray Samuels Raptor, and Moth Si2a3H. Both connected via rca interconnects to the Transporter.

Thanks for any help with this.



JC
post #2 of 10
Quote:
Originally Posted by Nightfall View Post
I have tried the Transporter connected to two of my headphone amplifiers, and in both cases, I have to nearly maximize the volume setting for an adequate playback level in my headphones.

The Transporter offers attenuation settings, but they require opening up the unit and changing jumpers. Of more concern, they mention that the attenuation is currently set to 0 db as a default, and you can change this to -10, or -20. These settings would, I am certain, lower the volume level even further.

JC
I only have a SB3 as my transport, and I use a separate DAC, but I recommend you to this forum..

http://forums.slimdevices.com/forumdisplay.php?f=7

They will have the answer.

Bazile
post #3 of 10
Quote:
Originally Posted by Nightfall View Post
It does improve just abit when the Transporter volume output is set to max, but then you get a certain degree of distortion until you back that down to 60-70%.
You're doing something wrong. The Transporter does volume control in the digital domain. A max volume out of the Transporter is equivalent to an unaltered source. It absolutely shouldn't be distorting in any way.
post #4 of 10
Double posted. Apoligies
post #5 of 10
Thread Starter 
Quote:
Originally Posted by Bazile View Post
I only have a SB3 as my transport, and I use a separate DAC, but I recommend you to this forum..

http://forums.slimdevices.com/forumdisplay.php?f=7

They will have the answer.

Bazile

I've posted there too, but they know squat about headamps and people here are obviously familiar with them. Also, there are a fair number of Transporter owners here too, and the familiarity with my, or similar equipment is an added bonus.


JC
post #6 of 10
Very well Sir;

You have not mentioned an outboard Dac. Are you using the analog outputs with the transporter volume at 100% straight to the headphone amp? I'll investigate, but I haven't posted much because lots here know lots more than me. I don't claim to be ignorant, but there is a LOT of experience here....me..I've lurked a lot is all.

Baz
post #7 of 10
OK, lets try and eliminate all the obvious things.

The RCA (unbalanced analog) outputs from a Transporter are line level sources. Headamps take line level sources and amplify them to drive headphones.

You've already tested this with another line level source (CD player) - so that eliminates obvious faults in the headamps and interconnects.


So lets sanity check the Transporter.

Check that you have your volume set to 100% ( 0dB) on the Transporter (use the remote to increase volume to max)

Press and hold power to reset. Then press '3' on the Slim Devices splash screen. This will play a full scale (0dB) 1kHz sine wave. (it does on the SB3)

WARNING - THIS MAY BE LOUD !

So start the headamp volumes at zero and increase volume.

Press and hold power to reset ( and turn off test tone)

How loud was this? - This should be the loudest output of the device, how does this compare to the music?

How loud is your music - does it come from a know good source?

There are some known good flac files - at differing dB values here.

How does the 0dB 1kHz flac file compare to the (3) Test tone?
The same / louder/ quieter ?

This I guess should provide enough evidence as to whether your transporter is defective,or there is another cause.

i.e. if the test tone is loud enough, and the 0dB flac file is the same volume as the test tone then all is well.

If this is not the case, then check that the internal analog volume attenuation (using jumpers) hasn't been set to one of the non 0dB values (e.g. -10, -20, or -30dB) - as this will lower the output volume. This could be the cause.

Hope this helps.

If this doesn't give you any joy contact slim devices support directly - at least you will have some test cases with known results you can tell them about.
post #8 of 10
Thread Starter 
Quote:
Originally Posted by Grahame View Post
OK, lets try and eliminate all the obvious things.

The RCA (unbalanced analog) outputs from a Transporter are line level sources. Headamps take line level sources and amplify them to drive headphones.

You've already tested this with another line level source (CD player) - so that eliminates obvious faults in the headamps and interconnects.


So lets sanity check the Transporter.

Check that you have your volume set to 100% ( 0dB) on the Transporter (use the remote to increase volume to max)

Press and hold power to reset. Then press '3' on the Slim Devices splash screen. This will play a full scale (0dB) 1kHz sine wave. (it does on the SB3)

WARNING - THIS MAY BE LOUD !

So start the headamp volumes at zero and increase volume.

Press and hold power to reset ( and turn off test tone)

How loud was this? - This should be the loudest output of the device, how does this compare to the music?

How loud is your music - does it come from a know good source?

There are some known good flac files - at differing dB values here.

How does the 0dB 1kHz flac file compare to the (3) Test tone?
The same / louder/ quieter ?

This I guess should provide enough evidence as to whether your transporter is defective,or there is another cause.

i.e. if the test tone is loud enough, and the 0dB flac file is the same volume as the test tone then all is well.

If this is not the case, then check that the internal analog volume attenuation (using jumpers) hasn't been set to one of the non 0dB values (e.g. -10, -20, or -30dB) - as this will lower the output volume. This could be the cause.

Hope this helps.

If this doesn't give you any joy contact slim devices support directly - at least you will have some test cases with known results you can tell them about.
I'll try this and report back. There will be a delay though, as I can't really do anything while the drives are still formatting for Raid, that should be done sometime tomorrow night. Thanks very much for your help Grahame!


JC
post #9 of 10
Thread Starter 
Quote:
Originally Posted by Bazile View Post
Very well Sir;

You have not mentioned an outboard Dac. Are you using the analog outputs with the transporter volume at 100% straight to the headphone amp?

Baz

Yes


JC
post #10 of 10
Thread Starter 
I tried your test Grahame, and the volume was still at very low volume. That done, I retraced everything about the setup. Well, the problem is now resolved. Somehow, a pair of 2 meter interconnects that had been loaned to me were the cause of it (I had none of sufficient length at the moment). When I swapped them out, after moving the unit closer to the amplifiers, and used my existing interconnects, no volume issue at all. Odd that any interconnect could possibly have made THAT degree of difference with volume, but they did.

Thanks to everyone for their help with this.


JC
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