Amps stable down to 1ohm or below...

[Al M.]

Spectral.

Cannot just drive MLs, but do so easily. Heard them sound *very* dynamic on these speakers. In fact, I had no clue that MLs can do macrodynamics that well until I heard them driven by Spectral.

[a.wayne]

Spectral are great sounding amps , but not for 1 ohm loads .....

[Al M.]

Spectral are great sounding amps , but not for 1 ohm loads .....

...says someone who hasn't heard what I did with them driving MLs.

[a.wayne]

...says someone who hasn't heard what I did with them driving MLs.

I haven't heard yours, but i have heard spectral and know the design well, it's not for 1 ohm , not enuff heat sink area , limited outputs so high beta droop.


What would interest me if you can, is an impedance graph on your modded ML's , i would consider a true 1 ohm load as being 1 ohm from 500 hz-20K, plenty musical content there .....




Regards ...

[Al M.]

I haven't heard yours, but i have heard spectral and know the design well, it's not for 1 ohm , not enuff heat sink area , limited outputs so high beta droop.


What would interest me if you can, is an impedance graph on your modded ML's , i would consider a true 1 ohm load as being 1 ohm from 500 hz-20K, plenty musical content there .....




Regards ...

It's not mine, but those of a friend (ML Odyssey). The panels are not modded.

I've heard the set-up many times, it's not a fleeting one-time impression. If you want to arm-chair argue with me, be my guest, it won't do you no good.

[Mike]

I haven't heard yours, but i have heard spectral and know the design well, it's not for 1 ohm , not enuff heat sink area , limited outputs so high beta droop.


What would interest me if you can, is an impedance graph on your modded ML's , i would consider a true 1 ohm load as being 1 ohm from 500 hz-20K, plenty musical content there .....




Regards ...

What about at 71hz?


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[a.wayne]

It's not mine, but those of a friend (ML Odyssey). The panels are not modded.

I've heard the set-up many times, it's not a fleeting one-time impression. If you want to arm-chair argue with me, be my guest, it won't do you no good.

Arm -chair arguing ? project much ..? Obviously you misunderstood my response ...?

[a.wayne]

What about at 71hz?


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Mike a 1 ohm dip is too narrow to be considered 1 ohm load as it will be confined to just that frequency. any decently built amp will not have an issue plunging such depths , of course there are those who will shy away for the moment ...


Now if you have a 1 ohm speaker from 71 hz-20K , most likely you will need a good hand truck to move the amp capable ...

[Mike]

Mike a 1 ohm dip is too narrow to be considered 1 ohm load as it will be confined to just that frequency. any decently built amp will not have an issue plunging such depths , of course there are those who will shy away for the moment ...

It’s multiple frequencies around 1ohm.


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[a.wayne]

It’s multiple frequencies around 1ohm.


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If with low sensitivity , then yes , big issues , no worries, you have an arsenal of amps quite capable ....

[Mike]

If with low sensitivity , then yes , big issues , no worries, you have an arsenal of amps quite capable ....

Luxman M900u - bipolar output stage. Stable down to 1ohm.

Hegel.
Bryston.




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[nile49]

i would consider a true 1 ohm load as being 1 ohm from 500 hz-20K, plenty musical content there .....

Is this the sort of load the infamous Apogee’s present? Are there other examples? Any modern production stuff?



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[a.wayne]

The apogee Scintilla were 1ohm from 20-20k and worse very low sensitivity ....

[johndoe21ro]

4 Ohm only , weak amplifiers IMO.....

I would have said that an VK-600SE or VK-655SE has 1200W in 2 ohms.

[a.wayne]

I had a pr of VK600’s with Bat packs , they sounded great on my monitors at 8 ohms , could not drive a pr ML Fullrange ESL’s and was weak on anything below 8/4 ohm , easily beaten by a pr of Aragon 4004 at the time ...

The very new maybe an improvement here , cant say never heard , i do like their tooby amps and Pre thou ..


Regards

[laynesaddiction]

Arm -chair arguing ? project much ..? Obviously you misunderstood my response ...?

I don't know about the current Spectral amplifiers, but if they have not changed since the early 1990s models, I have to agree with a.wayne. At that time I attempted to drive a pair of Apogee Duetta Signatures (not as bad as other Apogee speakers, but a hard load nonetheless) and the amplifier kept thermally shutting down. I had all their recommended components in the path (borrowed from the dealer, MIT cables and the current Spectral preamp of the day). The store owner came out and set it up himself as he thought I might have wired something incorrectly, but again. about 10 minutes of Chris Cornell wailing at a not-so-loud SPL shut them down.

Again, I don't know about their current models.

[Al M.]

I don't know about the current Spectral amplifiers, but if they have not changed since the early 1990s models, I have to agree with a.wayne. At that time I attempted to drive a pair of Apogee Duetta Signatures (not as bad as other Apogee speakers, but a hard load nonetheless) and the amplifier kept thermally shutting down. I had all their recommended components in the path (borrowed from the dealer, MIT cables and the current Spectral preamp of the day). The store owner came out and set it up himself as he thought I might have wired something incorrectly, but again. about 10 minutes of Chris Cornell wailing at a not-so-loud SPL shut them down.

Again, I don't know about their current models.

A 1 Ohm load throughout was never the point. I was answering about Martin Logan's which dip down into 1 Ohm.

[a.wayne]

A 1 Ohm load throughout was never the point. I was answering about Martin Logan's which dip down into 1 Ohm.

Apogee duetta's are a 3 ohm load , ML are 1 ohm only at very high frequencies, so very little load ..... The OP is about 1 ohm and lower, spectral will not work here IMO ...



Regards ...