modman
Seeker Of Truth
Posts: 4 
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Post by modman on Dec 5, 2017 19:36:17 GMT -5
Breaking in a new set of T1's. I'm a fan of AMT designs. I replaced a set of JBL 4408A monitors in the TV room. Those had the crossovers reworked with air foil inductors and MIT and InfiniCap capacitors.
I found the T1's a bit damped on transients on CD's I know well. Other speakers here reproduced those. I ended up adding a pair of film bypass caps across the tweeter crossover capacitor. That fixed that problem. I used a polypropylene .1 uf 400V InfiiniCap with a .01 uf 630V polystyrene.
Those added the damped last 1/2 octave at 15~20k adding the missing realism. I'm using an Adcom 400 preamp with Analog Devices opamps. The power amp is a modified Adcom GFA 545 with Kimber silver interconnects and 8TC speaker cable. The Dac is a prototype BurrBrown PCM 1704 based built by Mytek Digital. |
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Post by novisnick on Dec 5, 2017 21:03:39 GMT -5
modman Welcome to the forum. Seem you know what you like and can change it to your liking! Very impressive! Glad you’re chiminin here. I’m Always interested in learning.
Let me pour you a cup of EmoBlue and Welcome you once again.
 
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Post by Casey Leedom on Dec 5, 2017 21:56:26 GMT -5
Hhmmm, sounds like you ought to be corresponding with Emotiva's Speaker Design folks ... [[ No idea who that is now that RoryB has moved on ... ]]
Casey
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Post by mfeust on Dec 6, 2017 14:46:49 GMT -5
Hhmmm, sounds like you ought to be corresponding with Emotiva's Speaker Design folks ... [[ No idea who that is now that RoryB has moved on ... ]] Casey RoryB has moved on? Mark |
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Post by foggy1956 on Dec 6, 2017 15:03:52 GMT -5
Hhmmm, sounds like you ought to be corresponding with Emotiva's Speaker Design folks ... [[ No idea who that is now that RoryB has moved on ... ]] Casey RoryB has moved on? Mark He knew that |
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Post by foggy1956 on Dec 6, 2017 15:57:13 GMT -5
Sorry missed the ? mark, yes he has. |
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Post by Casey Leedom on Dec 6, 2017 16:48:12 GMT -5
I hadn't know that Rory had moved on till I tried to reference him in my note. I must have missed his goodbye note. Too bad. He seemed like a good guy.
In any case, like I said, I'm not sure who's taken over that part of the business at Emotiva.
Casey
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modman
Seeker Of Truth
Posts: 4
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Post by modman on Jan 7, 2018 16:37:54 GMT -5
I also did this same mod to a pair of B1's I use as small nearfield studio monitors. Those are excellent with the Adcom GFA 545 power amp and Kimber speaker cable. The preamp is a custom built unity gain current feedback design with a -120 dbu noise floor and a whopping 2000V/us slew rate. THD is 1.5 ppm. Bandwidth is 30 mhz.
The DAC is a custom built Ross Martin Audio Super Beast fitted with a low noise Linear Tech regulated power supply and Analog Devices ADA 4898-1 opamps. The DAC chips are Burrbrown PCM/DSD 1792's in a dual cosine config with a 132 db dynamic range. The entire rig from DAC to speakers is direct coupled, no caps in the signal path.
The speakers hold up very well with this stuff as I am a pro audio biz designer here as well as a musician and listener.
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