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View Full Version : Will the amp on SB2 have a little more juice than SB1?



Chris Glushko
2005-03-23, 19:08
I use an older receiver/amp exclusively for music so I
don't have the luxury of using the SB's digi output.

I was fortunate enough to have received my SB1 less
than 30 days prior to SB2 being announced and since I
had issues streaming lossless audio, Slimdevices
honored their guarantee and accepted my SB1 for
refund.

In the interim I borrowed an Airport Express and can't
help but notice how much higher the output level is
and how much brighter the resulting sound feels.

I understand the DAC will be far superior on SB2, but
should we expext a beefed up amp as well or at least
the ability to turn it up to a higher line level?

seanadams
2005-03-24, 07:09
>
>
> I understand the DAC will be far superior on SB2, but
> should we expext a beefed up amp as well or at least
> the ability to turn it up to a higher line level?


Yes, Squeezebox2 has 6 volt peak-to-peak line out levels, which is the
standard for high-end equipment. Squeezebox1 is 3Vpp.

Higher line-out levels are better because:

- levels will match when switching between digital and analog sources
at a receiver
- in a/b tests where levels are not matched, louder sources sound better
- higher output voltage means better noise immunity on the cable and
into the receiver

Robin Bowes
2005-03-24, 12:44
Sean Adams wrote:

>
> Yes, Squeezebox2 has 6 volt peak-to-peak line out levels, which is the
> standard for high-end equipment. Squeezebox1 is 3Vpp.
>

Sean,

How is this output level determined? Is there anyway to tweak a SB1 to
increase the output levels (other than adding a x2 voltage gain stage!)?

R.
--
http://robinbowes.com

seanadams
2005-03-24, 16:38
On Mar 24, 2005, at 11:44 AM, Robin Bowes wrote:

> Sean Adams wrote:
>
>> Yes, Squeezebox2 has 6 volt peak-to-peak line out levels, which is
>> the standard for high-end equipment. Squeezebox1 is 3Vpp.
>
> Sean,
>
> How is this output level determined?

Play a full-amplitude sine wave and look at peak-to-peak voltage on a
scope.

You can also use a standard volt meter (set to measure AC voltage)
which will tell you RMS voltage.

To convert from RMS to peak-to-peak voltage for a sine wave, multiply
by 2 * 2

> Is there anyway to tweak a SB1 to increase the output levels (other
> than adding a x2 voltage gain stage!)?

No - would require cutting traces, adding an internal 9V power supply,
op-amp chip, and a handful of resistors and caps.