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View Full Version : Sample rate limitations on SB3 and earlier



westiebj
2013-08-05, 09:24
Hi

I realize that there is a limitation with SB3 ( and earlier ) whereby 96 / 24 is down sampled by the server. Now my question is this :-

I am using the digital out and assume that technically the stream can be passed thru untouched and retain its sample rate / bit depth etc ?

If so, how can I configure the server to ignore any such down sampling prior to passing it on ?

I have a large amount of my music store at either 96 / 24 and its fine through my touch but I want to use my SB3 into my second system ( Meridian AC200 + DSP3200 ) without any quality degradation

Thanks in advance

Squeezed_Rotel
2013-08-05, 10:00
Hi

I realize that there is a limitation with SB3 ( and earlier ) whereby 96 / 24 is down sampled by the server. Now my question is this :-

I am using the digital out and assume that technically the stream can be passed thru untouched and retain its sample rate / bit depth etc ?

If so, how can I configure the server to ignore any such down sampling prior to passing it on ?

I have a large amount of my music store at either 96 / 24 and its fine through my touch but I want to use my SB3 into my second system ( Meridian AC200 + DSP3200 ) without any quality degradation

Thanks in advance

I can't answer most of your questions, but I think that you must have >LMS 7.7 to pass through >48. I think.

pippin
2013-08-05, 10:13
No, nothing to do with the server version.
And no, you can't pass through 96kHz, the limitation is with the processor, not the DAC. The SB3 only supports 48kHz/24 bit.

JohnSwenson
2013-08-05, 12:17
As pipin mentioned the limitation is with the processor used in the SB3 and earlier devices, it can only handle a data rate up to 48KHz, so it supports only 44.1 and 48. The Touch and Radio use much faster processors that can handle the faster sample rates rates.

John S.

westiebj
2013-08-05, 14:34
Thanks for the replies guys.

Oh well I guess I will have to invest in another SBT .. or similar

Mnyb
2013-08-05, 19:55
SB3 supports 24/48khz so it's at least 24 bits .

A Touch or Transporter also have better spdif outputs with lower jitter etc.

But realistically if you use it as transport to a decent DAC I doubt you can actually hear the difference under controlled cicumstances ( abx or ab blind test ) , neither the jitter or sample rate .

An interesting experiment to do is to downsample 24/96 or similar to lower rates and test that need controlled circumstances you mighty be surprised ( or not ) .

However a Touch may work better electrically there is also noise etc to consider .
But I think it's a bit wishfull thinking to just assume that having a 24/96 or 24/192 capable streamer will make a huge difference .
With triodes EDO plugin you can actually get 192k out of a Touch :) a neat feature .

You do get rid of the server resampling this can use a lot of resources if you run the server on a nas or other small CPU .
Some nas or similar does not support resampling at all . This s a very tangible improvement .

Mnyb
2013-08-05, 20:00
Arre you already using a separate dac ? If not you may find the analog out of touch an improvement .
And the ability to run some apps and native AAC that an sb3 can't handle.

westiebj
2013-08-06, 01:29
Hi

I am using the dac's built into the Meridian DSP3200 speakers ( they are active ) and support 96k

I don't have any 192k music ( doubt I will ever either )

Thanks

Mnyb
2013-08-06, 21:22
Hi

I am using the dac's built into the Meridian DSP3200 speakers ( they are active ) and support 96k

I don't have any 192k music ( doubt I will ever either )

Thanks

Cool speakers :) Then an unmodified Touch would do just fine , that's what I use to feed my Meridian system ( se signature ) . I have compared with my G98DH playing cd's and I can't tell them apart .

With a normal Touch 192k stuff will be resampled to 96 by the server this is absolutely transparent ( if the server is up to it ) so it's not an issue . If an hd music shop sells both 96 and 192 I go for the 96k version if all else is equal as there would be no point with more .

westiebj
2013-08-07, 12:16
Thanks .. yes I'm very impressed with the DSP3200's

Its a second room system and FAR better than I thought it would be

I have just managed to secure a pre-owned SBT on fleabay for 200 GBP ... which apparently is quiet a fair price!