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  #1  
Old 05-19-2020, 08:58 PM
direstraitsfan98 direstraitsfan98 is offline
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Default best way to horizontal bi amp

Hello just wondering if fellow McIntosh owners here on the AF forum could offer me their experience and insight on how best to go bi amping my speaker using a MC275 for the highs and a MC462 for the low end. I have C53 preamp.

Wondering how to match the two amps. MC275 has 20.5dB gain from the 8ohm taps and MC462 has 22.9dB gain from the 8ohm taps.

I could use 16ohm taps from the MC275 and I would get a very close 22.7dB of gain maybe that is close enough to just use things as is

BUT my speaker, JBL 4367, are 6ohms from 1kHz to top of the audio band, pretty ruler flat 6ohm actually. Not sure if using the 16ohm taps is a good idea or even viable option, it makes much more sense to use 8ohm taps , but then the gain does not match.

Is there a way to program the C53 to level match things?

Will I be using the 2nd output of the C53 to the MC275? Or would I use the output of the MC462 to the MC275? I don't know if you can have two output on the C53 active a the same time.

Thanks for any help guys

Last edited by direstraitsfan98; 05-20-2020 at 12:18 AM.
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  #2  
Old 05-19-2020, 09:22 PM
direstraitsfan98 direstraitsfan98 is offline
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Oh, just realized that the MC462 has 20.4dB of gain from the 4ohm taps and the MC275 has 20.5dB of gain from the 8ohm taps.

I'm already using the 4ohm taps of the MC462 anyway. I think I would get good results doing that?

Would I not need to use an external crossover in this case?
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  #3  
Old 05-19-2020, 11:44 PM
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RaceCarDriver RaceCarDriver is offline
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I too have wondered about bi-amping with the 275 & 462 with a C53 or C2700.

I see 2 ways to do it.

Output 1 C53 -> MC462 -> MC275

Output 1 C53 -> MC462
Output 2 C53 -> MC275

If it were me, I would probably try option 1 first, go from the 462 to 275 as that would still leave output 2 being available in the future.
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Old 05-20-2020, 12:17 AM
direstraitsfan98 direstraitsfan98 is offline
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I will email mcintosh next week when they open for their thoughts.
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  #5  
Old 05-20-2020, 09:29 PM
rob725 rob725 is offline
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I think there is a good chance your last option will work well. The c53s equalizer works really well and should help you dial it in if needed.
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Theater/Listening Room:
2 Ch: And LR for HT using passthrough
Speakers: Mc XRT1.1K tri-amped; 3 x Shunyata Sigma 1.5m SCs per side
Amplification Mc MC901 & MC1.25KW monoblocs; Shunyata Sigma ICs;1 AudioQuest Niagra 5K per side powering amps using Shunyata Sigma PCs
Preamp/Digital Mc C1100 Preamp Sh. Sigma V2 PC; Mc D1100 DAC Sh Sigma PC; Mc MCT500 transport Sh. Venom 14 PC; : Intel NUC w/Mc Drvr as Roon Endpoint, Sh. Sigma USB, Sh. Venom 14D PC; Sh. Denali 6000/s v2.
Analog Basis 2200Sig TT; Basis SuperArm 9 TA; Lyra Etna SL Cart;
HT:
Speakers: C-B&W CT8.2LCR; LRSur-B&W CT8.4 LCRS; R-B&W 804D2; CeilAtmos-4X B&W CCM8.5D; SUB-2X JL Gotham
Amps: C+Surr MC303; R+Atm- 2 x MC255
PrePro/Video: Marantz AV8805; KScape; Sony 4kBluRay; Sony VPL-VW995ES 4K Laser Proj.
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  #6  
Old 05-20-2020, 09:31 PM
rob725 rob725 is offline
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Also, will work either way; c53 will output to both if you wish. I run from pre to 1.25 to 901. Works fine.
__________________
Theater/Listening Room:
2 Ch: And LR for HT using passthrough
Speakers: Mc XRT1.1K tri-amped; 3 x Shunyata Sigma 1.5m SCs per side
Amplification Mc MC901 & MC1.25KW monoblocs; Shunyata Sigma ICs;1 AudioQuest Niagra 5K per side powering amps using Shunyata Sigma PCs
Preamp/Digital Mc C1100 Preamp Sh. Sigma V2 PC; Mc D1100 DAC Sh Sigma PC; Mc MCT500 transport Sh. Venom 14 PC; : Intel NUC w/Mc Drvr as Roon Endpoint, Sh. Sigma USB, Sh. Venom 14D PC; Sh. Denali 6000/s v2.
Analog Basis 2200Sig TT; Basis SuperArm 9 TA; Lyra Etna SL Cart;
HT:
Speakers: C-B&W CT8.2LCR; LRSur-B&W CT8.4 LCRS; R-B&W 804D2; CeilAtmos-4X B&W CCM8.5D; SUB-2X JL Gotham
Amps: C+Surr MC303; R+Atm- 2 x MC255
PrePro/Video: Marantz AV8805; KScape; Sony 4kBluRay; Sony VPL-VW995ES 4K Laser Proj.
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