[flom]

Hi all!
I am really glad to be the future owner of this wonderful machine.

I will be normally delivered tomorrow. I had the opportunity to test the sp1.7 but I forgot one specific test :

I own a quite good CD player (optimized Cayin CDT17) & I plan to use it in an analog mode w/ the preamp.
I also have some very sharp and fine subwoofers powered by velodyne (DD series) & and I wanted to integrate them in a stereo mode.

What do you suggest, in term of optimized configuration, to better run the Bryston in a ByPass analog mode, allowing subs to work (vs the main speakers). I had the opportunity to read about Xbass management? I just don't plan to use my CDPlayer as a transport layer excluding analog decoding processes...

Please help
Fabien

[Levi]

Congrats!

I would use the CD's analog connection and 2ch by-pass mode for the preamp.  I would then connect the sub via high-level input from the amp.  

This setup will give you the tranparency that the SP1.7 is capable of un-rivalled by other preamp in this price range.

[flom]

Congrats!

I would use the CD's analog connection and 2ch by-pass mode for the preamp.  I would then connect the sub via high-level input from the amp.  

This setup will give you the tranparency that the SP1.7 is capable of un-rivalled by other preamp in this price range.

Thx so much for your quick answer  

I am not sure of what you mean by "high-level input from the amp" ?
Do you mean I should chain my resources this way :

CDP(2*RCA/Analog)->SP1.7(2*RCA/asymetric)->Sub(2*RCA/asymetric)->Amp ? or

CDP(2*RCA/Analog)->SP1.7(2*RCA/(a)symetric)->Amp->Sub(2*RCA/asymetric)->Main_Speakers...

I suppose this configuration is impacting the global bandwith received by the amp (some degradations?)
This configurations involved a specific setup and utilization of the Sub in a multichanel environment?
This configuration disable the option of a full symetric configuration between préamp & amp ?
As you can read, I am a very "blue user" and given my questions, I did not understand completely your recommendation  
Thx again for help
Fabien

[MOZ]

Hi Fabien,

As i told you, Mike Pickett from Bryston gave me this answer about the same kind of problem (years ago) :

Hi Olivier;
 
The 2 Channel bypass mode on the SP1.7 completely bypasses the entire DSP module, and thus does not allow any filtering of either main speakers or the subwoofer.  The subwoofer can be enabled, in a full range summed mode, by a discreet IR code that is entered with the remote control.
Simply press the Code button, then Mute, Stereo, Mute.  This corresponds to the number 060.  The display will read “Bypass Sub: Yes”.
If you need high pass filtering on your main speakers however, you would be better off using the “Stereo” mode on the 1.7, especially if you can use the onboard DA converters as well.  This allows you to do all the filtering in the digital domain, which will sound much better than an outboard analog crossover.

James, what do you think about Fabien's request ?

[James Tanner]

Hi,

If I am understanding Fabien's question I believe he wants to use the analog output from his CD player through the 2-channel BYPASS on the SP1.7 with his Subs.

Mike Picketts input is correct. The Sub output on the SP1.7 can use the special code and you have SUB OUT available in 2-channel bypass - BUT the signal is FULL RANGE so you must adjust the gain and the crossover point at the subwoofer therefore, the sub must allow for that. The other issue is that the Main speakers are still running full range so there is no highpass crossover point on the mains. The Sub output on the SP1.7 would still work in this set-up with Home Theater Digital DD, DTS etc. but the settings on the sub (gain and crossover point) would be the same as in the stereo bypass mode.

If you want to roll off the Mains and control Gain and Crossover points to the Sub you must go through the Digital section of the SP1.7 so the CD player would have to be plugged into the Digital input on the SP1.7 instead of the 2 Channel analog input.

james

[flom]

Thx Olivier & James for these valuable inputs.

I will make some tests & comparisons & therefore will make the appropriate choice
Cheers
Fabien

[Levi]

I am not familiar with Velodyne subs.  I use REL sub which has several types of inputs and crossover settings.  There are two crossover settings can be configured in REL subsystem.  One is for the High-Level input and the other is for the low-level input coming from the Preamp sub output.

To clear things up, I use speaker level input in my sub for 2ch listening.  The output from left and right channel coming from the amp is fed into the high-level input of the sub.  Crossover is set way lower than 80hz, I had mine at 27hz.  In theater mode, the low-level input of the sub is used which is the sub output from the processor.  You want this crossover at 80hz.  REL subsystems allows you to have the best of both worlds.

Thx so much for your quick answer  

I am not sure of what you mean by "high-level input from the amp" ?
Do you mean I should chain my resources this way :

CDP(2*RCA/Analog)->SP1.7(2*RCA/asymetric)->Sub(2*RCA/asymetric)->Amp ? or

CDP(2*RCA/Analog)->SP1.7(2*RCA/(a)symetric)->Amp->Sub(2*RCA/asymetric)->Main_Speakers...

I suppose this configuration is impacting the global bandwith received by the amp (some degradations?)
 ...