Rob 2,299 Posted February 15 Share Posted February 15 (edited) I was running my 1.0 and 4.0 hooked up to a CT7. Max volume is @ 5 o'clock and I wasn't touching the max headroom. Loud and crystal clear. So why? Why cant I have full control of both amps and hit max headroom at say, 3 o'clock? When I run 1 amp I can max it out with no problem. Edited February 15 by Rob 2 2 Link to post Share on other sites
aceman117 696 Posted February 15 Share Posted February 15 (edited) I can't crank my system right now but tomorrow when I get home from work I'm going to blast it to see how it sounds! I'll see if I can peg the meters on the tfm-75, 2 A,-760X and PT - 2400! Two Carver amazings, two Platinum IV's, two Carver silver series( bi -amped), 4 301's and two Klipsch 400 w subwoofers. 5,960 pure watts of amp power on tap, so far. .Crank it, baby! Edited February 15 by aceman117 2 4 Link to post Share on other sites
Rob 2,299 Posted February 15 Author Share Posted February 15 Its nice to know that especially if I have people over and they get control of it. 😂 3 Link to post Share on other sites
Dadvw 2,369 Posted February 15 Share Posted February 15 I would look at the schematic and see if the output gain can be adjusted the same as the C-1 and C-4000 preamps. That would give you more gain and more output from the amps. 2 Link to post Share on other sites
Yamacarver 77 Posted February 17 Share Posted February 17 I recently started running multiple amps with y cables because I didn't know I could do that in the past lol. I can't even go to 12:00 without serious pain due to my wall of speakers. I just demoed the intro of "Born to be wild"for my neighbor (new Harley) definitely louder than a real Harley and when the drums hit, it hurt. Anyway I would try and check the voltages to see which amp it is. https://www.audioholics.com/audio-amplifier/amplifier-voltage-gain 2 Link to post Share on other sites
Rob 2,299 Posted February 17 Author Share Posted February 17 I think also it had to do with Spotify having songs that are playing at a lower recorded level because I played the same song with a CD and I couldn’t max it out. 2 Link to post Share on other sites
Rob 2,299 Posted February 17 Author Share Posted February 17 20 minutes ago, Yamacarver said: I recently started running multiple amps with y cables because I didn't know I could do that in the past lol. I can't even go to 12:00 without serious pain due to my wall of speakers. I just demoed the intro of "Born to be wild"for my neighbor (new Harley) definitely louder than a real Harley and when the drums hit, it hurt. Anyway I would try and check the voltages to see which amp it is. https://www.audioholics.com/audio-amplifier/amplifier-voltage-gain I will definitely look into the link. Because if the Y cables also have something to do with it then I need to look at other possibilities. 2 Link to post Share on other sites
johnrotten 970 Posted February 17 Share Posted February 17 46 minutes ago, Yamacarver said: I can't even go to 12:00 without serious pain due to my wall of speakers. 12:00 and it's time to ROCK! 😛 1 2 Link to post Share on other sites
RodH 4,514 Posted February 17 Share Posted February 17 YOU GUYS ALL NEED HELP!!! Loud enough for ya? 5 Link to post Share on other sites
Yamacarver 77 Posted February 17 Share Posted February 17 I didn't mean to imply there was a problem with the y cables as mine are working great in fact you should be able to daisy chain them and run several amps. Yeah it sounds like your problem was a weak signal to begin with. my Bluetooth seems to have a weak signal. It's definitely nice when all your sources have the same level, that's why my tuner has an adjustable output. 2 Link to post Share on other sites
kve777 5,758 Posted February 17 Share Posted February 17 The CT-Seven is running out of OP-AMP driving power. It uses a uPC4570HA-1 opamp for output(IC752). After it are R761/762(1KΩ) and R763/764(100kΩ) as voltage dividers. Theoretically, reducing the value of R761/762 and increasing the value of R763/764 should increase output, BUT! This may allow IC752 to drive at too high a current level. 3 1 Link to post Share on other sites
B-Man 3,388 Posted February 18 Share Posted February 18 A properly configured C-1 will cure this issue... 🙃 3 1 Link to post Share on other sites
Rob 2,299 Posted February 18 Author Share Posted February 18 2 hours ago, B-Man said: A properly configured C-1 will cure this issue... 🙃 I have one just waiting for a motorized pot and remote. Got the grundy and the Bill-D kit. 1 Link to post Share on other sites
jeffs 1,670 Posted February 18 Share Posted February 18 (edited) Hooking up two properly functioning amplifiers should not create the issue that you present. The output of the Ct7 does have a resistor divider (1K/100K) followed by 2 series 470 ohm resistors - then on to the output. The 100K is insignificant, but even including it the calculation produces roughly the following results (I rounded the 470 ohms to 500 for simplicity): One amplifier with 47K input impedance you will get 94.9% of the signal to the amp: -0.45dB Two amplifiers with 47K input impedance you will get 91.2% of the signal to each amp: -0.8dB This difference is not enough to cause much variation. Your source material must be at a much lower level than it was with one amp connected? The C-1 will in fact change these numbers but not much. One set of C-1 outs has 200ohm series resistor, the other has 200 ohm with a 36K load. Both amps should get over 99% of the output level. edit: But the C-1 likely has more overall system gain with so it may in fact give you the desired result with lower level source material. Edited February 18 by jeffs 4 Link to post Share on other sites
Rob 2,299 Posted February 20 Author Share Posted February 20 Well I do have a C1 that is on deck for the Bill D mod, Grundy, and motorized pot. So it will be nice to experience it with a couple 4.0’s . I really do like the CT-7 because of the tuner and remote capabilities. 1 Link to post Share on other sites
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