or Connect
AVS › AVS Forum › Audio › Receivers, Amps, and Processors › Official Classe SSP-800 thread.
New Posts  All Forums:Forum Nav:

Official Classe SSP-800 thread. - Page 145

post #4321 of 5782
Thanks Tony. I will give them a call.

Kind Regards,
Luca
post #4322 of 5782
Quote:
Originally Posted by a2k2000 View Post

I was planning to use a MAc Mini. Or the other option was a Synology Diskstation DS211 NAS server which has an ITunes server built in. If it can output sound via the USB then I might be able to use the Apple Remote software on my IPad or IPhone and avoid either turning on the plasma to browse the music list or buy another small screen for which there is no space.

Why not use the HDMI out of the macmini? Then you use the ipad remote program to control it without the plasma...?
post #4323 of 5782
The issue is I do not have a Mac mini. Probably I should get one.
post #4324 of 5782
I'm interested in getting a surround sound processor or a multichannel dac preamplifier. Just trying to get an opinion on what the best option should be.

1. Prism Orpheus Multichannel Dac/ Preamplifier
2. Anthem D2v processor
3.Classe SSP800 processor

I'm looking for the best multichannel Dac and preamplifier performance. My speakers are Emerald Physics CS 2.3 which need to be bi or tri amped. I don't need alot of video processing as my
Kuro can take care of that. Just want best jitter and multichannel sound quality possible.

I Appreciate any advice that u can give.

Dante,
post #4325 of 5782
Quote:
Originally Posted by Hayb2006 View Post
I'm interested in getting a surround sound processor or a multichannel dac preamplifier. Just trying to get an opinion on what the best option should be.

1. Prism Orpheus Multichannel Dac/ Preamplifier
2. Anthem D2v processor
3.Classe SSP800 processor

I'm looking for the best multichannel Dac and preamplifier performance. My speakers are Emerald Physics CS 2.3 which need to be bi or tri amped. I don't need alot of video processing as my
Kuro can take care of that. Just want best jitter and multichannel sound quality possible.

I Appreciate any advice that u can give.

Dante,
The Anthem is not in the same league as the other two. The Prism Orpheus is an amazing DAC, one of the best I've ever heard. It's fairly neutral, almost lean. The Classe is a great sounding unit in its own right - I have experience with both, but in two different systems (never tried the Orpheus for surround).
post #4326 of 5782
The Orpheus lacks HDMI and HD decoding which are necessary for HT, if that is an issue.
post #4327 of 5782
Quote:
Originally Posted by Hayb2006 View Post

I'm interested in getting a surround sound processor or a multichannel dac preamplifier. Just trying to get an opinion on what the best option should be.

1. Prism Orpheus Multichannel Dac/ Preamplifier

I see the Orpheus listed at the Spatial website for their EQ system. Seems Emerald want their speakers to be biamped thru their 8th-order LR crossover and use their own EQ. Would the Orpheus be a complete substitute for the Behringer processor normally included in the Emerald system?
post #4328 of 5782
Quote:
Originally Posted by Kal Rubinson View Post

The Orpheus lacks HDMI and HD decoding which are necessary for HT, if that is an issue.

That is an issue but can decoding be done on the mac mini that I would use as a home theater pc?
post #4329 of 5782
Quote:
Originally Posted by Ian_Currie View Post


The Anthem is not in the same league as the other two. The Prism Orpheus is an amazing DAC, one of the best I've ever heard. It's fairly neutral, almost lean. The Classe is a great sounding unit in its own right - I have experience with both, but in two different systems (never tried the Orpheus for surround).

I dont mind neutral spatial has plugins to simulate things like tube sound. It's also alot cheaper then the classe
post #4330 of 5782
Quote:
Originally Posted by Roger Dressler View Post

I see the Orpheus listed at the Spatial website for their EQ system. Seems Emerald want their speakers to be biamped thru their 8th-order LR crossover and use their own EQ. Would the Orpheus be a complete substitute for the Behringer processor normally included in the Emerald system?

Yup hoping to to us the Orpheus as a Dac preamplifier and crossover via FireWire from a mac mini into a amp and then into my CS2.3s.

Will this work?
post #4331 of 5782
Quote:
Originally Posted by Hayb2006 View Post

That is an issue but can decoding be done on the mac mini that I would use as a home theater pc?

Can the MacMini decode these formats? And, if so, can it output it as multichannel digital to the Orpheus over firewire?
post #4332 of 5782
Quote:
Originally Posted by Hayb2006 View Post

Yup hoping to to us the Orpheus as a Dac preamplifier and crossover via FireWire from a mac mini into a amp and then into my CS2.3s.

Will this work?

That's what I was asking you...
post #4333 of 5782
Quote:
Originally Posted by Roger Dressler
That's what I was asking you...
Sorry I guess I miss read. From my conversations with underworld hifi the behringer serves as the crossover between the preamplifier and the Dac. Since the Orpheus unlike the behringer serves also as a preamplifier that I would simply plug this into a power amp and then into my speakers. I guess my question is weather the ssp-800 can serve as the Dac preamplifier and active crossover. As the Orpheus can. And wearer the ssp-800 is worth mire then double the price of the orpheus if u happen 2 know?
post #4334 of 5782
Quote:
Originally Posted by Roger Dressler View Post
That's what I was asking you...
This may help roger;at least for transcoding ;looks hopeful for the future.

http://forums.plexapp.com/index.php/...pressed-audio/
post #4335 of 5782
Quote:
Originally Posted by Hayb2006 View Post

Sorry I guess I miss read. From my conversations with underworld hifi the behringer serves as the crossover between the preamplifier and the Dac. Since the Orpheus unlike the behringer serves also as a preamplifier that I would simply plug this into a power amp and then into my speakers. I guess my question is weather the ssp-800 can serve as the Dac preamplifier and active crossover. As the Orpheus can. And wearer the ssp-800 is worth mire then double the price of the orpheus if u happen 2 know?

The SSP-800 can be a 100 Hz crossover and operate in bi-amp mode for 2 outputs (L/R). But it does not have as steep a crossover slope as Orpheus uses. And not sure what the EQ curve looks like. The PEQ could probably do what is needed, if one could use the Behringer as a reference for a while. The question is whether the Orpheus defined parameters are essential or not.
post #4336 of 5782
May I ask what exactly are the HDMI issues are with the SSP-800 ?
post #4337 of 5782
Does anyone happen to know the specific output impedances values for the SSP-800? This is not my area of expertise (as can be plainly seen by my ignorance here), but I'm working with someone on possible amplifier choices and he has asked for the specs for RCA and XLR separately. The published 56 ohms, he figures, is a general value for the balanced outputs.

Specifically he's looking for the resistance values between pin 2 & 3 and between pin 1 and 2 for the XLR and between RCA tip and shell. I tried--and failed, because I got inconsistent readings all over the map--to get readings directly with an ohm meter. He indicated that might be because the I/Os are relay switched.

Anyway, if anyone happens to know, I'd appreciate it.

Thanks!
Jerry
post #4338 of 5782
Sorry,but this sounds like you're both headed for a big headache! Neither of you have an actual amp with specs or to actually connect to listen to? Are there any amps already in the system? Just experimenting?
post #4339 of 5782
Well, it's a little more involved than I've suggested--and certainly we're not selecting an amp based on these values. But they would be "nice to know."
post #4340 of 5782
Quote:
Originally Posted by Jerry Powell View Post

Does anyone happen to know the specific output impedances values for the SSP-800? This is not my area of expertise (as can be plainly seen by my ignorance here), but I'm working with someone on possible amplifier choices and he has asked for the specs for RCA and XLR separately. The published 56 ohms, he figures, is a general value for the balanced outputs.

Specifically he's looking for the resistance values between pin 2 & 3 and between pin 1 and 2 for the XLR and between RCA tip and shell. I tried--and failed, because I got inconsistent readings all over the map--to get readings directly with an ohm meter. He indicated that might be because the I/Os are relay switched.

Anyway, if anyone happens to know, I'd appreciate it.

Thanks!
Jerry

I would contact Classe directly for that info or consider one of Classe's amps. I couldn't be happier with my monoblocks.
post #4341 of 5782
Thanks, Tony. I have owned Classe's monoblocks in the past and was very happy with them--just not suitable for this particular situation.

I have reached out to Classe also. Just thought someone might know online and I could get a quick answer, but if not, I'm sure I'll get an answer from Classe eventually.

Thanks again,
Jerry
post #4342 of 5782
Quote:
Originally Posted by Jerry Powell View Post

Does anyone happen to know the specific output impedances values for the SSP-800? This is not my area of expertise (as can be plainly seen by my ignorance here), but I'm working with someone on possible amplifier choices and he has asked for the specs for RCA and XLR separately. The published 56 ohms, he figures, is a general value for the balanced outputs.

No, you cannot measure the output impedance of a preamp with an ohmmeter, since there may be either DC offset or a coupling capacitor present. If your friend is asking you to do that, I would be concerned.

Also, since no one would ever drive a preamp into any load that is less than, say, 100x the output impedance, it hardly matters what the specific impedance is, be it 56 ohms, 100 ohms or the like. If your friend is thinking of doing that, I would be concerned.

Why not just tell us what is so "involved"? We have time.
post #4343 of 5782
If Classe is using one of the balanced line driver ICs, like a DRV134, then the output impedance will probably be in the neighborhood of 50 ohms, using IC vendor recommended component values. Most of these circuits are designed to drive anything from 600 ohms upward with very low distortion. They also will drive a substantial amount amount of line capacitance, so you don't need to worry about high frequency rolloff for moderate length interconnects.

The way you measure source impedance is to backfeed the output through a moderately high resistance (like 1K ohms) from a signal generator. The resultant AC voltage developed across the interface will allow you to calculate the output impedance using the voltage divider rule.
post #4344 of 5782
Many thanks for the additional and informative responses. I'd rather not get into more details about the whys and wherefores right at this time, Roger--not trying to be mysterious nor cagey, believe me, and appreciate the "concerns" raised. But let's leave it at that for the moment, please.

Thanks to all!
post #4345 of 5782
Quote:
Originally Posted by fastl View Post

If Classe is using one of the balanced line driver ICs, like a DRV134, then the output impedance will probably be in the neighborhood of 50 ohms, using IC vendor recommended component values.

It uses National LME49720 which is rated to drive 600 ohms. It has a closed loop output impedance of 0.01 ohms, so the SSP will be defined by whatever breakout resistance it uses. That appears to be 56 ohms for single ended. Assuming they use the same parts for the balanced stage, it would be 112 ohms.
post #4346 of 5782
Super! Many thanks, Roger.
post #4347 of 5782
...It has a closed loop output impedance of 0.01 ohms, so the SSP will be defined by whatever breakout resistance it uses. That appears to be 56 ohms for single ended. Assuming they use the same parts for the balanced stage, it would be 112 ohms....

0.01 ohms at DC, but rising 6 dB/octave above its open-loop breakpoint. Anyway, if they have emulated a floating output like the DRV134, then the output impedance should remain fixed at 56 ohms, single-ended or differential. If that's not the case, then DON'T ground the negative output terminal if you want to feed a single-ended termination from the XLR output, because you'll windup shorting the negative output driver thru 56 ohms.
post #4348 of 5782
Quote:
Originally Posted by fastl View Post

0.01 ohms at DC...

They specify Rout at 10 kHz. The open loop gain at 10 kHz is 80 dB. If the closed loop gain is 20 dB, then the output impedance is 0.01 ohms, like they said.

Quote:


Anyway, if they have emulated a floating output like the DRV134...

I am quite certain Classe did not do that. It's just parallel inverted outputs. And with each leg having its own 56 ohm resistor, the total output impedance will indeed be 112 ohms.

Quote:


then the output impedance should remain fixed at 56 ohms, single-ended or differential. If that's not the case, then DON'T ground the negative output terminal if you want to feed a single-ended termination from the XLR output, because you'll windup shorting the negative output driver thru 56 ohms.

That's why they give you a single ended output jack.
post #4349 of 5782
I downloaded the LME49720 data sheet, and the spec table doesn't state/imply that the closed loop gain is 20 dB for the output resistance parameter. It simply says "closed loop" 0.01 ohms, which typically implies Av=1 (i.e. voltage follower).

The 0.01 ohm device output resistance is a moot point anyway, because the combined trace resistance of the PWB and contact resistance of the output connector is going to be at least an order of magnitude higher. So, you'd never see the 0.01 ohms.

The big advantage of floating differential outputs (ala DRV134) is that they work almost as well into single-ended terminations as they do into fully differential loads. Typically, they'll give you 50+ dB ground noise (ground loop) rejection. For what the SSP800 costs, it's pretty cheesy to just stick a common inverter in there instead of a fully floating output!
post #4350 of 5782
Quote:
Originally Posted by fastl View Post

I downloaded the LME49720 data sheet, and the spec table doesn't state/imply that the closed loop gain is 20 dB for the output resistance parameter. It simply says "closed loop" 0.01 ohms, which typically implies Av=1 (i.e. voltage follower).

It shows the Rout is measured at 10 kHz, and the open loop gain at 10 kHz is 80 dB. I used that to find what closed loop gain would give 0.01 ohms, and that came out to 20 dB. Seems reasonable to me, but not sure why they did not specify the test circuit.

Quote:


The 0.01 ohm device output resistance is a moot point anyway,

Exactly. The point was that it is defined not by the active circuit, but by the breakout resistor.

Quote:


The big advantage of floating differential outputs (ala DRV134) is that they work almost as well into single-ended terminations as they do into fully differential loads. Typically, they'll give you 50+ dB ground noise (ground loop) rejection.

That's why they give you a balanced output jack.
Quote:


For what the SSP800 costs, it's pretty cheesy to just stick a common inverter in there instead of a fully floating output!

I think it would have been cheesier to put in an output stage with 20 dB higher THD+N for no real benefit when driving balanced amplifiers.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Receivers, Amps, and Processors
AVS › AVS Forum › Audio › Receivers, Amps, and Processors › Official Classe SSP-800 thread.