Mezmerize DCB1 Building Thread - Page 27 - diyAudio
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Old 27th February 2011, 09:59 AM   #261
AndrewT is online now AndrewT  Scotland
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The maximum output voltage of the F5 is ~14.7Vac
The gain through the DCB1 and the F5 is ~ 6times.
You need a signal source that can put out a maximum of 2.45Vac if you want to use the full capability of the F5.
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Old 27th February 2011, 10:47 AM   #262
Salas is offline Salas  Greece
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Did anybody ever measure their RMS CDP or DAC analogue output using a test CD or file and average music they listen to? Some output much higher than others. I recommend a check with a DVM set to ACV even if without an oscope before projecting some system gain structure.
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Old 27th February 2011, 10:53 AM   #263
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Quote:
Originally Posted by chalkandtalk View Post
I have just put together an F5 - and I like it! What drew my attention to it was the simplicity of the circuit. My preamp has a lot of gain and my speakers are fairly efficient so there's more than ample volume.

Someone then recommended the DC B1, because the circuit is simple as the F5. Has anyone used a B1 with the F5? I'm a bit concerned that there won't be enough gain. It may mean that I go for new speakers.
I'm using the DCB1 with the F5 and a Buffalo II DAC, I changed a bit the output of the I/V module of the Buffalo for get more than 2V, but I'm using a 96dB loudspeakers.

With the F5 is very important the offset on the DCB1 be as low as possible
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Old 27th February 2011, 11:09 AM   #264
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Thanks for these ideas - you've answered my question. My main source is a Twisted Pear Dac, whose exact output I'm not sure of, but must be around 2Vac. So I decided to plug it straight into the F5 and see - controlling volume in iTunes. It's plenty loud enough. Deafening in fact.

In the past I have tried to plug the Dac into various power amps, but haven't liked the result as much as when using an active pre. However, I like what I'm hearing from the F5 so much I think I might ditch the preamp altogether. Maybe it's because of the Fets which my previous power amps have not had.
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Old 27th February 2011, 11:12 AM   #265
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Hi Ramallo

thanks for post.

Have you tried feeding the Dac into the F5?

Have you put a cap in between the DCB1 and F5?
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Old 27th February 2011, 11:47 AM   #266
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Quote:
Originally Posted by chalkandtalk View Post
Hi Ramallo

thanks for post.

Have you tried feeding the Dac into the F5?

Have you put a cap in between the DCB1 and F5?
You are welcome!

I not tried with the Buffalo, I tried with my old Lavry DA10, with the DCB1 I have much better bass (But I don't know what is the reason).

I don't use caps between DCB1 and F5, my DCB1 have a offset of L=0,1mV R=-0,8mV, usually I measure every week the DC on the F5 output and always the offset is below 10mV.
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Old 27th February 2011, 12:02 PM   #267
Salas is offline Salas  Greece
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There was a range of opinions about Lavry VS Benchmark among studio people. Did you ever compare? The Benchmark revealed quite a chunk of extra performance after I substituted its only internal signal coupling electrolytic cap for Auricap. Highly recommended if any of your studio friends has a DAC1 as they are ubiquitous in pro circles.
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Old 27th February 2011, 01:41 PM   #268
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Quote:
Originally Posted by Salas View Post
There was a range of opinions about Lavry VS Benchmark among studio people. Did you ever compare? The Benchmark revealed quite a chunk of extra performance after I substituted its only internal signal coupling electrolytic cap for Auricap. Highly recommended if any of your studio friends has a DAC1 as they are ubiquitous in pro circles.
I have both (as well and some Apogee's units).

My Benchmark DAC1 is very old (Rev B), the new Benchmark DAC1 have some changes (to good), they changed the output OP's from NE5532 to LME49720, they changed the electrolytic capacitor at I/V output to a film/electrolytic combination (in parallel). The variable circuit is better (The variable out of the original DAC1 isn't as good as the fixed). Between the old and the new DAC1 unit you can have noticeable differences in sound (Much better the new units).

But I prefer the Lavry DA10 sound than the DAC1 (old version), with the new DAC1 is difficult to say.

I changed the coupling electrolytic capacitor by a Mundorf ZN with better results, but the great thing is change the OP amps (But need change the feedback loop of the OP amp because the LME49720 is faster).

The Buffalo is in another league
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Old 27th February 2011, 01:48 PM   #269
Salas is offline Salas  Greece
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I have RevB also, I keep it fixed output.
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File Type: jpg DAC1moded.jpg (730.7 KB, 635 views)
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Old 27th February 2011, 03:16 PM   #270
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the buffalo is higher than 2vrms, more like 3vrms in voltage mode from what i gather with setting up owens d1 iv stage as i am matching mosfets for tc at 3vrms using 1khz sine. i'm using the ackodac with it, with es9012, but i gather they are the same in this regard.

i much prefer the lavry, i agree with popular opinion that the dac1 sounds rather awfully dry, past the point pof neutral to the point of being boring and insipid. perhaps i heard an early version with too clinical sounding gear synergy afterwards. certainly no mods, perhaps the dcb1 would help out with breathing some life back into the sound.

i also like auricaps salas, great value caps and come on, yellow and red...who could hate that

Last edited by qusp; 27th February 2011 at 03:21 PM.
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