My_Ref Fremen Edition RC - Build thread - Page 84

udailey · 6th December 2012, 02:52 PM

It looks like it has pre outs. Are these pre outs "Audessey'ed"? If you can hook them up to the MyRef and then run the Audessey program I would say then you can do a true comparison.

ClaveFremen · 6th December 2012, 03:00 PM

Quote:

Originally Posted by udailey

It looks like it has pre outs. Are these pre outs "Audessey'ed"?

It should be...

Quote:

Originally Posted by udailey

If you can hook them up to the MyRef and then run the Audessey program I would say then you can do a true comparison.

I do agree

badrisuper · 6th December 2012, 03:07 PM

Quote:

Originally Posted by udailey

It looks like it has pre outs. Are these pre outs "Audessey'ed"? If you can hook them up to the MyRef and then run the Audessey program I would say then you can do a true comparison.

To do that I need to remove the volume pot from MyRef? Is that enough straight straight away send the input to the board? Or do I need to change any component values to make it as a power amp?

Thanks
Badri

ClaveFremen · 6th December 2012, 03:16 PM

Quote:

Originally Posted by badrisuper

To do that I need to remove the volume pot from MyRef? Is that enough straight straight away send the input to the board? Or do I need to change any component values to make it as a power amp?

The only change you have to do is to remove the pot, straight connection from pre.outs to FE's inputs

badrisuper · 6th December 2012, 03:19 PM

Quote:

Originally Posted by ClaveFremen

The only change you have to do is to remove the pot, straight connection from pre.outs to FE's inputs

Okay. I will do it and update. Can this help to identify the clipping issue?

udailey · 6th December 2012, 03:45 PM

Andrew probably gave you the answer to the clipping issue. Your source output is likely to high or you could drop the gain of the MyRef down. Probably easier than a new source

Of course you could also divide the voltage out of the source or change the gain of the source itself but easier to focus on MyRef and just change the feedback resistor value.

AndrewT · 6th December 2012, 06:45 PM

I cannot agree that changing the MyRef gain is a good solution.

That change will almost certainly require a redesign of the compensations.

I can recommend a change in the attenuation immediately before the MyRef.
Leaving the added attenuation this late in the chain minimises the amount of noise added by the attenuation.
Try a 20dB (divide by 10) first and see if that gets you into the ballpark.
I'd suggest a 10k resistor and a 1k resistor wired in series as the load for the 10k volume pot.
The MyRef input pin gets connected to the junction of the 10k & the 1k.
The bottom of the vol pot and the bottom of the 1k and the MyRef Signal Ground all get connected together.

You could add the extra attenuation before the vol pot, but this would require the added attenuator and the vol pot to be located at the MyRef on very short leads.

romvise · 7th December 2012, 11:14 AM

Quote:

Originally Posted by ClaveFremen

Do you have any pic of the interior or of the build process?

Yes, see the attachments, I've taked just before the front leds installation.

Quote:

Originally Posted by bcmbob

And is that a horn or TL speaker?

Thank you Bob, the speaker are Penaudio Chara and Charisma in a three channel configuration, the "stand" cabinet is the bass unit, the upper unit have others two channels.
This is a good review: Penaudio's Chara-Charisma -- Is Compromise A Good Thing? Review By Rick Jensen

AndrewT · 7th December 2012, 11:19 AM

Sprague must be OK. I have not heard anything bad by using it.

atupi · 10th December 2012, 08:43 PM

Finally i have some good speakers (XTZ 99.26) now and i can say the alternate config of RC (390R-220uf) sounds much better, better imaging and details. Maybe can be fatigueing on some "bright" speakers but not on my ribbon tweeters.

6th December 2012, 02:52 PM	#831
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	It looks like it has pre outs. Are these pre outs "Audessey'ed"? If you can hook them up to the MyRef and then run the Audessey program I would say then you can do a true comparison. __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

6th December 2012, 03:45 PM	#836
udailey Passive Aggressive diyAudio Member Join Date: Mar 2008	Andrew probably gave you the answer to the clipping issue. Your source output is likely to high or you could drop the gain of the MyRef down. Probably easier than a new source Of course you could also divide the voltage out of the source or change the gain of the source itself but easier to focus on MyRef and just change the feedback resistor value. __________________ You can purchase LDRs anytime to build a standard LDR attenuator or to build my new LDR Attenuator "A Lighter Note". Email me. diyldr@gmail.com

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6th December 2012, 06:45 PM	#837
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	I cannot agree that changing the MyRef gain is a good solution. That change will almost certainly require a redesign of the compensations. I can recommend a change in the attenuation immediately before the MyRef. Leaving the added attenuation this late in the chain minimises the amount of noise added by the attenuation. Try a 20dB (divide by 10) first and see if that gets you into the ballpark. I'd suggest a 10k resistor and a 1k resistor wired in series as the load for the 10k volume pot. The MyRef input pin gets connected to the junction of the 10k & the 1k. The bottom of the vol pot and the bottom of the 1k and the MyRef Signal Ground all get connected together. You could add the extra attenuation before the vol pot, but this would require the added attenuator and the vol pot to be located at the MyRef on very short leads.

7th December 2012, 11:19 AM	#839
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Sprague must be OK. I have not heard anything bad by using it.

10th December 2012, 08:43 PM	#840
atupi diyAudio Member Join Date: Oct 2010 Location: Bucharest	Finally i have some good speakers (XTZ 99.26) now and i can say the alternate config of RC (390R-220uf) sounds much better, better imaging and details. Maybe can be fatigueing on some "bright" speakers but not on my ribbon tweeters.