Please help with SP1.7 Problem

TT9 · « **on:** 9 Jan 2005, 10:07 pm »

Hello everybody, I have stumbled across this excellent looking forum while trying to find an answer to my problem. I hope someone can help me!

Has anyone tried feeding an SP1.7 digital signal via Perpetual Technologies little P-1A ?

I have taken a Bryston SP1.7 on loan having given back an MC-12B which I did not like. I enjoy my SST power amps so hope the 1.7 is for me also. Anyway, for Digital Music listening, I use a DVD32R transport, the Perpetual Technologies P-1A upsampler, and then the digital input into a processor. Ultimately I will be getting a Dan Wright Sig2 P-3A but thats another subject.

Anyway in the mean time, I have a small problem with this combination. If I set the sample rate on the P-1A to 96Khz, the display on the Bryston correctly shown the incoming signal as this, but there is no music, only a nasty pink noise. If the sample rate is set as 44 or 48, these numbers are also correctly shown and the music is fine. I have tried experimenting also with the bit density but it doesn't make any difference at the 96Khz rate. At the two lower sample rates, I can output the full 24bits without problem, but nothing at 96 seems to work.

Is something faulty or is there a reason why this would not work ? Does anyone know enough about the SP1.7's internals to be able to offer an explanation why this should or shouldn't work ?

I have this working fine with my old AV32R and the borrowed MC12-B.

Thanks and Regards,
Steve.

James Tanner · « **Reply #1 on:** 10 Jan 2005, 10:38 pm »

HI TT9,

What version of software do you have in the SP1.7 or give me the serial number.

james

TT9 · « **Reply #2 on:** 11 Jan 2005, 09:12 pm »

Hello James,

Thankyou kindly for taking the time to repsond.

The firmware is verison 41 I believe. This is the message I get from the display upon startup. I have not checked the serial as is all nicely in rack but if essential I can unplug and look for you.

May I ask you something else as well ? If I stop my dvd player, and then open the tray to remove the disk, there is a very audible 'pop' sound from the speakers. I have searched previous posts and believe this was an identified problem ?

Also can I just add that I am very pleased with this machine. I have a 4BSST and 9BST, and PMC OB1's actually so I think I will be ordering my SP1.7 when my demo unit has to go back. Is so much more musical than the Lexicon, I thank you.

Best,
Steve.

James Tanner · « **Reply #3 on:** 11 Jan 2005, 10:38 pm »

Hi Steve,

The 41 is quite old so the new software (44D) will solve the issues you have been having.

Thanks for your positive comments regarding the sound of the SP1.7. I get about 2 callers a week telling me that they had such-and-such a processor in their system - replaced it with the SP1.7 and can not believe the increase in quality of sound.

james

Levi · « **Reply #4 on:** 12 Jan 2005, 06:00 am »

Hello TT9,

I have auditioned a Lexicon MC12b in my home and Bryston SP1.7 clearly sounded more transparent in 2ch by-pass mode. The pop you are hearing possibly is coming from the source. I would try a different source and see if the "pop" is still there. If so, James already has a solution for you. You will need a high quality Robertson bit. The aluminium fasteners are easy to strip.

Levi

jradley · « **Reply #5 on:** 13 Jan 2005, 12:51 pm »

Quote from: Levi

You will need a high quality Robertson bit. The aluminium fasteners are easy to strip.

Levi

I'd agree - I mushed up the head of one of the screws on my SP1.7 when attempting to upgrade mine to 44D. I'm still wondering what to do about it.

If I can get to the Bristol HiFi show here in the UK at the end of Feb I'll see if I can chat up the PMC guys and see if they might take it off me and see what they can do - I'm a bit scared at what they might charge though.

Coincidently it was to avoid the same pop that I was attempting to upgrade my unit.

Enjoy the SP1.7 - it is a fine pievce of kit.

Cheers,

John

James Tanner · « **Reply #6 on:** 13 Jan 2005, 01:15 pm »

HI John,

You need a"Green Handle Robertson" screw driver to get the screw out.

james

TT9 · « **Reply #7 on:** 13 Jan 2005, 01:49 pm »

Guys,

Thank you all for your support and advice on this thread. I have decided definitely to purchase a new SP1.7 and have informed my local dealer to start the wheels turning with PMC and acquire me a new one.

Those years ago (about 3) when I bought my AV32R, nice machine it was and gave me lots of listening pleasure, if I'd slackened my wallet only a little bit more and gone for the Bryston then at that time I would have saved myself this whole merry-go-round. .

Anyway, I definitely feel I am moving up onto a higher audio plane, so it's all got a happy ending.

Best,
Steve.

TT9 · « **Reply #8 on:** 13 Jan 2005, 01:56 pm »

Guys,

Thank you all for your support and advice on this thread. I have decided definitely to purchase a new SP1.7 and have informed my local dealer to start the wheels turning with PMC and acquire me a new one.

Those years ago (about 3) when I bought my AV32R, nice machine it was and gave me lots of listening pleasure, if I'd slackened my wallet only a little bit more and gone for the Bryston then at that time I would have saved myself this whole merry-go-round. .

Anyway, I definitely feel I am moving up onto a higher audio plane, so it's all got a happy ending.

One last thing please. For my curiosity, would anyone have a link or some documents which details the changes and additional features between each of the software versions between say 41 -> 44D. Am interested to see.

Best,
Steve.