Passive Horizontal Bi-Amping question

[WOPL Sniffer]

I'm preparing to wire up my Martin Logan 60XTi's for passive Horizontal Bi-amping using a 400 II WOPL for the Low freq's and a 700 II WOPL for the high end or versa veesa. Martin Logan "Recommends" using 2 identical amps for passive bi-amping (They say DO NOT USE ACTIVE X-OVERS which I am NOT doing), and they say if you "Must use 2 different amps, they say you should use 2 amps with the same gain (or adjustable gain.... Volume knob's???) or gain characteristics. Being that my amps share the WOPL moniker, I figure that the designer utilized the same techniques when he designed them so I think they should be "More than close enough". ML was talking about a Sonic Imbalance could occur if using a Kraco amp and an amp that works would cause something like that. Impedances, damping ground schemes, volume pots, outputs etc.. are about the same after WOPLing so Damn the Torpedoes, full speed ahead............. Active Bi-amping is not in the cards so keep that in mind when commenting. Now that the weather is changing for the better, I can turn all these heaters and shit off so I got power to spare and I just had a dedicated circuit installed so I don't have any surprises when jamming and then somebody turns on the air compressor or the electric fireplace. I hate it when you lose power while listening to Bob Denver or John Denver as far as that goes........... SKIPPERRRR, I'm rocky Mountain High............

 

[BlazeES]

Had no idea you had some 60XTi's.

 

[George S.]

I'm interested in what Joe thinks about this.

 

[WOPL Sniffer]

Had no idea you had some 60XTi's.

After I went to the dudes house to listen to them, I snapped them up quick. This is my last set. I sold all the others. These ML's sound friggin EXCELLENT!!!!

 

[Gepetto]

The gain of 400s, 700s (with pots maxed), Model ONEs (also with pots maxed or bypassed) is IDENTICAL. The only difference is the max power each can produce before clipping

 

[WOPL Sniffer]

I'm interested in what Joe thinks about this.

Me too. I think it may be a non issue.

 

[Gepetto]

As is the damping factor and every other parameter

 

[WOPL Sniffer]

The gain of 400s, 700s (with pots maxed), Model ONEs (also with pots maxed or bypassed) is IDENTICAL. The only difference is the max power each can produce before clipping

Yup, Thanks Joe, it's best to wait for the experts to chime in. We don't need no stinkin clipping...........

 

[WOPL Sniffer]

As is the damping factor and every other parameter

So do you think I should use the 400 on the High side or the low side???

 

[J!m]

Put the amps as close as possible to the speakers.

 

[Gepetto]

So do you think I should use the 400 on the High side or the low side???

High side Perry, there is little energy in the HF when compared to the lows...

 

[mr_rye89]

That's how I have it, 400 on the tweeters, 700 on the woofers. Since I scrapped the passive crossovers and went active I've found the compression driver tweeters are more sensitive than the woofers so I tweaked the gain with the MiniDSP.

But since your biamping with passive crossovers this should not be an issue.

 

[laatsch55]

So do you think I should use the 400 on the High side or the low side???

Are they electrostatic?

 

[BlazeES]

Are they electrostatic?

The XTi's are the follow-on to the XTs that I've owned for several years now. The tweets are those ML folded motion quasi-ribbons; the rest are more traditional
cone drivers.

 

[BlazeES]

These ML's sound friggin EXCELLENT!!!!

The imaging is practically mind altering.

 

[WOPL Sniffer]

Are they electrostatic?

Nope. Regular ol speakers

 

[WOPL Sniffer]

Put the amps as close as possible to the speakers.

7' is as close as possible

 

[WOPL Sniffer]

The imaging is practically mind altering.

That's why I got rid of all the others.... After hearing them on my wopl, I have to agree.

 

[George S.]

The gain of 400s, 700s (with pots maxed), Model ONEs (also with pots maxed or bypassed) is IDENTICAL. The only difference is the max power each can produce before clipping

That was my experience from running full range frequency sweeps using REW (Room Equalizer Wizard) when setting up the MiniDsp active crossover. The 700 WOPL driving stereo subs, 400 WOPL driving woofers, another 400 WOPL driving the mids, and a recapped stock PL300S2 on the tweeters.
The gain was evenly matched and no gain adjustments were needed in the MiniDsp that's feeding the four amps.
Those are awesome looking speakers Sniff!
Hope they're keepers!

 

[WOPL Sniffer]

That was my experience from running full range frequency sweeps using REW (Room Equalizer Wizard) when setting up the MiniDsp active crossover. The 700 WOPL driving stereo subs, 400 WOPL driving woofers, another 400 WOPL driving the mids, and a recapped stock PL300S2 on the tweeters.
The gain was evenly matched and no gain adjustments were needed in the MiniDsp that's feeding the four amps.
Those are awesome looking speakers Sniff!
Hope they're keepers!

I had never heard of Red Walnut but they are beautiful.