Bi amping with a C-1

[mlucitt]

The Acurus has a specified 50 ohm output impedance.

My upgraded PL2000 Preamplifier signal output comes right off the output of a Texas Instruments/Burr Brown "SoundPlus" OPA2134 SMT OPAMP (formerly RCA 4136) via a BrownDog adapter P/N 060601 and through a Panasonic 22uF/63V DC Blocking Capacitor in each channel. There is no pulldown resistor.
I can find no reference for the PL2000 Output Impedance, but the output impedance (Zo) of the OPA2134 is 10 Ohms.

My PL1000 Autocorrelator Noise Reduction System only has a 47K pulldown resistor on each channel output. And I like it that way.

 

[WOPL Sniffer]

The 200ohm resistor and the 36kohm resistors on Main 1 Are the resistors we use to change the gain. Look at the C1 Service Bulletin. You can only change the gain on main 1. You can read the SB if you are so inclined.

Main 2 does not change. So, main 2 has the 200 ohm but no place for the 36K and I'm sticking with my RL-11. With the Vertical Bi-amp

Hey, I didn't write the stuff.......


I misspoke earlier, I am running Passive Horizontal Bi-Amping. As mentioned above, this is how Martin Logan tells you how to do it and Active Biamping is a no-no since the speaker internal crossovers cannot be bypassed. This also explains why the sound sucked. The 2 channels on the Carver C1 are not gain matched. If ya want to argue, call Bob and call Martin Logan. The Acurus is set up for this. The C1 is probably OK if I went back to regular speaker hook-ups but I LIKES me 2 WOPL's playing together and sounding SWEET.....


When I was running my Horns, they were so sensitive that we regularly changed the gain on Main 1 (Sniff's EZ Gain Board) and if swapping out speakers, all you had to do was go to main 2 and it is always in the stock gain setting.

For the Bi-amp naysayers....................

 

[Gepetto]

The 200ohm resistor and the 36kohm resistors on Main 1 Are the resistors we use to change the gain. Look at the C1 Service Bulletin. You can only change the gain on main 1. You can read the SB if you are so inclined.

Main 2 does not change. So, main 2 has the 200 ohm but no place for the 36K and I'm sticking with my RL-11. With the Vertical Bi-amp

Hey, I didn't write the stuff.......


I misspoke earlier, I am running Passive Horizontal Bi-Amping. As mentioned above, this is how Martin Logan tells you how to do it and Active Biamping is a no-no since the speaker internal crossovers cannot be bypassed. This also explains why the sound sucked. The 2 channels on the Carver C1 are not gain matched. If ya want to argue, call Bob and call Martin Logan. The Acurus is set up for this. The C1 is probably OK if I went back to regular speaker hook-ups but I LIKES me 2 WOPL's playing together and sounding SWEET.....


When I was running my Horns, they were so sensitive that we regularly changed the gain on Main 1 (Sniff's EZ Gain Board) and if swapping out speakers, all you had to do was go to main 2 and it is always in the stock gain setting.

For the Bi-amp naysayers....................



View attachment 87188

Yes you can change the attenuation on Main1 since it has a series resistor plus a pull down. By increasing the value of the current 200 ohm resistor (increases output impedance), you can reduce the output signal, or you can do similar by decreasing the value of the current 36K ohm resistor (reduces output impedance a bit)

 

[Dnspy007]

Main 2 does not change. So, main 2 has the 200 ohm but no place for the 36K and I'm sticking with my RL-11. With the Vertical Bi-amp

This is the suggested Main 2 Gain match fix from The CarverSite, I received years ago.



OOPS....Forgot this...

 

[Gepetto]

If you are not using the headphone jack outputs on the C-1, the main1 and main2 outputs could be reconfigured to use those op amps instead