As far as I know there has not been any comments from the designer about the "missing" DC-blocker cap on Cedarburg. On other occasions he seems very keen about this cap?
But it would be hard to find space for it on the Cedarburg board?
My own conclusion is that we take a "calculated risk" by not implementing it
As far as I can see the AD797 is DC-coupled:
AD797 pdf, AD797 description, AD797 datasheets, AD797 view ::: ALLDATASHEET :::
But it would be hard to find space for it on the Cedarburg board?
My own conclusion is that we take a "calculated risk" by not implementing it
As far as I can see the AD797 is DC-coupled:
AD797 pdf, AD797 description, AD797 datasheets, AD797 view ::: ALLDATASHEET :::
Organize a team of collaborators and work on the problem(s) together. I have every confidence that you'll surprise your collective selves, coming up with astonishingly clever solutions and wildly innovative approaches. This will of course require plenty of work, but since it's team-work, you'll have loads of fun and make some new friends along the way. After it's complete, and kicking some serious sonic bbutt, you can release your design to the diyAudio membership as a whole. Their gratitude will be immense, I'm sure of it.
Brief first impressions. The 1612A has a little more midrange depth and treble is a little clearer. The AD797 excels with better bass.
This test was done with my Martin Logans. In the next few days I'm going to hook up my line arrays with their ribbon tweeters and offer another review.
Regards,
Dan
That's great to hear Dan!
Very happy to see you got some listening impressions between the 1612 and the Cedarburg as these seem to be consistent favorites and the 1612 is one of the most commonly picked opamps for the Whammy - myself included.
Happy building and happy listening!
Having to try and decide between such excellent performers is a good problem to have. Thanks Nelson, Mark, Jim and of course Jason!
That's great to hear Dan!
Very happy to see you got some listening impressions between the 1612 and the Cedarburg as these seem to be consistent favorites and the 1612 is one of the most commonly picked opamps for the Whammy - myself included.
Happy building and happy listening!
Having to try and decide between such excellent performers is a good problem to have. Thanks Nelson, Mark, Jim and of course Jason!
The two of them are so close I couldn't recommend one over the other.
Both are exceptional!
And yes, I really appreciate all those who put the work into providing us with
these little audio gems.
Regards,
Dan
Have you tested any of the other IPS,fex Austin and more?Brief first impressions. The 1612A has a little more midrange depth and treble is a little clearer. The AD797 excels with better bass.
This test was done with my Martin Logans. In the next few days I'm going to hook up my line arrays with their ribbon tweeters and offer another review.
Regards,
Dan
Or IPS 6..
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Nope. I chose the top picks from the reviews to get me started. I have other projects in the pipeline so time is limited.
Regards,
Dan
hi team,
M2X is one of the amp I didn't build yet
Thank you, Fred
A unique design having the ability to change 'front ends'. It's this ability that took it to the next level in my system. I was easily able to try different opamps to find out which sounded best to me.
Also, PCB design and layout was second to none. IMHO well worth a try.
Regards,
Dan
I am very happy with my M2x amp. I swap in different input stage daughter cards pretty frequently and am pleased with this capability.
I seem to recall diyAudio moderator "Zen Mod" expressing quite a fondness for the M2 at one time or another, but that may have been quite some time ago. For all I know he may have a new favorite.
I seem to recall diyAudio moderator "Zen Mod" expressing quite a fondness for the M2 at one time or another, but that may have been quite some time ago. For all I know he may have a new favorite.
M2x re-affirmed DIY for me. Awesome amp, endless opportunities for enhancements. I have 95db speakers, and my only negative is a long run of RCA cables from pre to M2x, causing some hum. I have no hum with shorted inputs, I’m pretty sure it’s the 18 foot RCA cables.
I love my M2x monoblocks. I look forward to the round 3 VFET amp, and have some SIT transistors for possible future amps, but the M2x amps are keepers,
I love my M2x monoblocks. I look forward to the round 3 VFET amp, and have some SIT transistors for possible future amps, but the M2x amps are keepers,
Bones, are you sure the hum isn't coming from the pre and not the cables? You might have something imperceptible until the MX2 amplifies it.
JT
Bones13,
Are you using the XLR outputs from your K&K Maxxed Pre and/or Bricasti M12? I built and used to own the K&K Maxxed Pre phonostage. An excellent phonostage and silent as a mouse given the Lundahl output transformers. But I only used XLR outputs.
Since you have a lengthy run from your sources to your amps, have you considered balanced XLR cables, albeit cheap ones just to test?
Like JT says, since the M2x is silent with the inputs shorted, it likely isn't the M2x but coming from the sources or picked up by lack of shielding on some brands of RCA cables.
Best,
Anand.
Are you using the XLR outputs from your K&K Maxxed Pre and/or Bricasti M12? I built and used to own the K&K Maxxed Pre phonostage. An excellent phonostage and silent as a mouse given the Lundahl output transformers. But I only used XLR outputs.
Since you have a lengthy run from your sources to your amps, have you considered balanced XLR cables, albeit cheap ones just to test?
Like JT says, since the M2x is silent with the inputs shorted, it likely isn't the M2x but coming from the sources or picked up by lack of shielding on some brands of RCA cables.
Best,
Anand.
Might be fun to pick up a 75 foot roll of aluminum foil from the grocery store, and cobble together a quick merde-rig external shield around each preamp-to-M2x interconnect wire. Try both possibilities of "OEO" (one end only) electrical connection to the aluminum foil shields: (i) connected to RCA ground at preamp end only; (ii) connected to RCA ground at power amp end only.
This is nothing but plain ordinaryjacking horsing around, good ole boy (redneck) tinkering for jollies while pretending to do science. But the sonic results may surprise you, and possibly suggest fruitful areas to concentrate upon, in subsequent experiments.
This is nothing but plain ordinary
I had a set of "good" RCA cables that hummed, and did all sorts of things to negate it. Hum from M2x, Aleph J, and my EL34 PP AudioNoteKits amp. Louder in the higher wattage amps. So I traded back to my "old" interconnects - BlueJeanCables - Coax RCA cables, with much less hum. I did not consider moving an amp closer to the Pre and trying shorter cables.
It might come down to relocating the amps to under the Pre and getting some longer speaker cables. I use 12ga Duelund currently in a ~4 ft run. Fitting the Mono blocks down there might be tight, but the new VFet will look great down there!
The Aleph J did not hum with XLR connections. I think the Aleph J is a true balanced amp, and the XLR cable works in true balanced mode, with interference rejection.
I read somewhere that just using the XLR cables, and configuring them for single ended use at one end negates the rejection.
Of course, proving it comes from the RCA output of my Pre would go a long way to determine a course of action. The Pre in question is a Bricasti M12 Dac/Pre, so its not something I created, or built.
It might come down to relocating the amps to under the Pre and getting some longer speaker cables. I use 12ga Duelund currently in a ~4 ft run. Fitting the Mono blocks down there might be tight, but the new VFet will look great down there!
The Aleph J did not hum with XLR connections. I think the Aleph J is a true balanced amp, and the XLR cable works in true balanced mode, with interference rejection.
I read somewhere that just using the XLR cables, and configuring them for single ended use at one end negates the rejection.
Of course, proving it comes from the RCA output of my Pre would go a long way to determine a course of action. The Pre in question is a Bricasti M12 Dac/Pre, so its not something I created, or built.
Bones, Before I went chasing cables and moving stuff, I would try another pre/source with the short cable, if no hum put the long one back in, if it's sill fine it's the pre/source, if not you have your answer on the cable too.
Seems like a simple way to do all the testing you need with the least amount of work...
JT
Seems like a simple way to do all the testing you need with the least amount of work...
JT
I did forget somewhere along the line that the M2X does not have a balanced input! Whoops!
Probably because all my Pass builds use a differential to SE converter circuit since my entire system is differential from the dac onwards and I don't use a preamp.
There are work arounds for that and they can all sound really good, such as the THAT 1200, an input transformer, or a modified instrumentational amplifier using operational amplifiers, etc... I am partial to the THAT1200 and well designed opamp circuits.
Best,
Anand.
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