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Post by mythundreamt on Jun 14, 2018 12:44:15 GMT -6
Great sounds too, by the way. What guitar/amps were they?
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Post by matt@IAA on Jun 14, 2018 12:54:25 GMT -6
Thanks! Clean guitar was a Strat, Heavy was a Les Paul, both tracked through a pair of JCMs (a dual super lead and a 900), each with a 57 and a dark LDC, all on a 3124. Different settings on each to taste for each part. Maybe the third center channel in the heavy part was a tele, I don’t remember. Heavy part is a hard panned stereo pair (4 tracks per side).
The clean bass was DI only, heavy part was an Ashdown ABM plus a DI, with a Big muff PI I think.
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Post by Blackdawg on Jun 25, 2018 21:40:13 GMT -6
I think your v2 ideas are great. Would be a great drum buss sum mixer. Looking forward to the results!
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Post by matt@IAA on Jun 26, 2018 17:52:28 GMT -6
Just for fun I did a quick comparison between op amps. The files are labeled, but I sent a mono stem of drums, guitars, and bass out through a BTA, into the summing amp, and out of the line amp in the box. Each position has an op amp, so each iteration changed all of the op amps in the signal path. There’s no summing going on, it’s all mono from end to end. This is like sending a single line input to your console and listening back through the stereo bus. Q is a Quad Eight style N is a Neumann style G is a GAR2520 (the control) No prefix are the digital bounces. www.dropbox.com/s/6r5clbmcf2bc7i1/op%20amp%20test.zip?dl=0
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Post by wiz on Jun 26, 2018 21:21:22 GMT -6
Just for fun I did a quick comparison between op amps. The files are labeled, but I sent a mono stem of drums, guitars, and bass out through a BTA, into the summing amp, and out of the line amp in the box. Each position has an op amp, so each iteration changed all of the op amps in the signal path. There’s no summing going on, it’s all mono from end to end. This is like sending a single line input to your console and listening back through the stereo bus. Q is a Quad Eight style N is a Neumann style G is a GAR2520 (the control) No prefix are the digital bounces. www.dropbox.com/s/6r5clbmcf2bc7i1/op%20amp%20test.zip?dl=0I liked N the best cheers Wiz
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Post by matt@IAA on Jun 27, 2018 7:01:00 GMT -6
wiz interesting. I mean, it's definitely splitting hairs and I'm not sure I could pick them out of a lineup. To my ears the differences I do hear seem to kind of be consistent Neumann on one side and gar2520 on the other, and the QE in the middle. Neumann has least HF content, gar2520 the most. Neumann seems the slowest / roundest, gar2520 seems fastest. The QE was my favorite, kind of middle. On the guitars, especially, to me the Neumann sounded "pinched" and the gar2520 "scooped". But this took some real focus for me...the differences are very, very subtle. I'm not sure if my testing method is the best.. I did them all at +/-20V. The QE "wants" 24V or 28V, and the Neumann can work up to 22. But 20V is the max for the 2520. I'm thinking about redoing the test at 22V, 28V, and 15V for the N, Q, and gar2520 to see if I hear any difference.
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Post by hugostiglitz on Jul 10, 2018 2:56:48 GMT -6
great impressive project and I don't want to be rude nor graceless but are you guys aware of this project: www.diy-racked.com/2016/04/dr-2402/somebody has already done all the work. features a 2520 DOA on every channel and 4 trannies in the output with an additional 4 DOAs too.
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Post by matt@IAA on Jul 10, 2018 12:17:43 GMT -6
That's a cool project, very similar to the 8 channel prototype I made. Triple stack 8 into 2. They also have direct outs after each channel being run by THAT 1646 and a volume pot - I assume that's what the TL074 is being used for. But holy cow, their estimate is $2100 for the whole build in a 3RU! I could build 5 of the 8 channels for that price, without the efficiency of a shared PSU and case.
I'm saving up enough to make the 1222 version. That should be a nice little project.
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Post by hugostiglitz on Jul 10, 2018 19:12:34 GMT -6
They also have direct outs after each channel being run by THAT 1646 and a volume pot - I assume that's what the TL074 is being used for. Yes indeed. The THAT IC is for the direct outs only and as far as I am aware the TL074's only purpose is to drive the LEDs. (It has bi-colored LEDs to indicate clipping) They will this year release a 1U break-out box which turns the direct outs into aux busses. So this will make it not only a summing mixer but a neat, serious little rack console, so to speak.
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Post by matt@IAA on Jul 10, 2018 19:29:36 GMT -6
Ah that makes sense, just operating as a comparator for metering. Cool!
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