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Bi-Amp two M-1.0t Amplifiers


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Hi All,

 

I am hoping someone can help answer the question of whether or not I can vertically Bi-Amp two M-1.0t amplifiers? My setup includes a Sunfire Classic Tube Preamp and the two amps previously mentioned. I've tried connecting the preamp to the amps via right channel output to right amp and the same for the left side using a y-cable. Then connecting the output from the amp to a speaker, left side to the tweeter and the right side to the woofer. Awful static and hum. Thoughts?

 

Cheers

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@aholloway17 First I have never done what you are asking about with a 1.0t. I think that they can be used to do a Vertical configuration unless someone has a reason why its not such a good idea.

 

From what I get from your description it sounds like you hooked things up correctly. You can look at the below schematics to see if any of them resembles how you hooked yours up.

 

The long of doing it with my  two sets of amps (275 and TFM35)

 

First, the switch on the back of both amps must be in stereo mode. Your speakers will need two sets of binding posts (high pass and low pass as some say) Don't know what configuration of binding posts you have on your speakers, but it sounds like you have this requirement.

 

I had to remove the jumpers from my speakers before I started wiring them up. I purchased banana plugs for all the speaker wire to make this go somewhat easier.

 

Its not a simple hookup and uses twice the amount of speaker wire and you will need two sets of "Y" cables which it sounds like you have. I made my own "Y" cables per this,

 

 

This is the wiring diagram that I used for when I did a Vertical Bi-amp configuration.

bi-amping-speakers-diagram-4.jpg

 

I also at one time wired it for a Horizontal Bi-amp confirmation per this,

image.png

 

I think that I kept it in the Horizontal configuration only because I got tired of spending time moving my equipment and rack around. I just wanted to listen to my system.

 

I did this for two different sets of amps and three configurations for each.

 

First Two Carver Crimson 275s then Two Carver TFM35s in a Vertical configuration, then Horizontal configuration with the amps in stereo mode, and then just plain old bi-wired with the amps in mono mode. 

 

The why you have static and hum I can't answer that question.

 

Edited by BobTFM35
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Forgot this,

 

1. The amps used have to be identical models.

 

2. The speakers need to be identical.


3. The cables used have to be the same design for left and right. I tried to make all the cables running between the preamp and amps the same length. This also went for the speaker wires.

 

 

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It seems to me, the m1.0t (both) should be non-inverting (has the stereo/mono switch).

In the non inverting model, the two negative (-) speaker leads are electrically tied together.

 

The reason for this, in my mind, is that the negative (-) posts on the speakers are likely tied together.


Personally, I see little advantage in doing it this way.

Again, in my opinion, if you are going to use multiple amps, go with an active crossover and bypass the internal passive crossover completely.

 

***This, of course, creates a whole new world of trying different active crossovers…***

 

Ask me how I know. 🤔

 

P.S. All of my experience in this has been with two way speakers.

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Well, thank you all for your council it has been very helpful. Both amps, the preamp, and speakers are singing along very nicely after much effort. In the process I discovered one amp's output connections is loose and is in need of repair but works if it isn't disturbed. It sounds like the second may be suffering some aging caps. In all, I think both will spend sometime on the bench of my local Carver expert.

 

One amp is non-inverting, I thought if stereo mode was selected it wouldn't be a problem. It caused a little static out of the right speaker. That actually resolves when using the Main 1 left channel output from the preamp and the Main 2 right channel to feed their respective amps via a Y connector. I am not sure that is the "long" term solution but it seems to be working nicely. As for the sound, the one clear difference is the bass signature is much more deep and present or clear. Thanks for getting me on a better path!

 

Cheers, 

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This is an interesting discussion. 

 

I have always bi-amped horizontally.  But, I've never really looked at vertical.  I wonder what the advantages are for each?

 

I know for horizontal bi-amping you can use different amps for the high part of the speakers vs. low.  I have done it with identical amps, too. I guess it just seemed more intuitive to me to set it up this way.... almost like treating the low side like a powered subwoofer in a conventional system.

 

What's the advantage of vertical biamping?.... I guess you could physically arrange the amps closer to the speakers, since each amp is only going to one speaker.  So, you'd have less high side wiring length to deal with. Is that a big benefit?  What other advantages are there?

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An interesting discussion and tedious process! From what I understand and have experienced, some amps aren't well suited to horizontally bi-amp, the more conventional way. In my case, I could choose the more conventional approach but wanted to bypass having to use and external crossover as is recommended if not required when connected horizontally. The vertical approach preserves the use of the amps internal crossover and referred to as passive setup. 

 

That's my 2 cents!

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21 hours ago, aholloway17 said:

As for the sound, the one clear difference is the bass signature is much more deep and present or clear. 

 

Thats a good enough reason to me!

 

I'm glad you got it sorted out and working. Thanks for sharing your journey. ~^

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