Class D is just Dandy!

@h2oaudio

What you do with your amplifiers is between you and your part supplier, but these are high current outputs. Unless specifically rated for such low loads I would never encourage anyone to attempt this without further input from the manufacturer. :)

Um, as a guy who makes loudspeakers, no, I don’t know what you mean, but measurement and experience trumps theory. It would be interesting to examine what happens to the output response on those scintillas, as they are pretty much the worst case scenario. :)

Honestly, those speakers were absolutely brutal. If ICEPower modules can drive them as well as you say they do that’s pretty astonishing, even for me, an obvious fanboy. I think the biggest, most lasting impression they have left on the audio industry was to give Krell a raison d’être. I think without Apogee loudspeakers the history and viability of Krell might have gone a different way.


Best,

E

There is no way an Apogee Scintilla will sound anywhere near it's best driven by ANY class-d, and they could just switch off or blow up.
 
Not only is it 1ohm @100hz, but it has a massive -90 degree phase shift at 100hz also, these two together mean almost a dead short as see by the amp.
Only the biggest heaviest Refererence Monoblock Krells of yesteryear can drive those sort of loads and sound good.

To quote a great Australian movie (The Castle)
"Tell'im he's dreaming son."
https://www.youtube.com/watch?v=dik_wnOE4dk

Cheers George

George,
If I'm not mistaken,do you still have a pair of ref600m.
If so what amps do you like better and what speakers do you use.
Just curious.

Kenny.

George,
If I’m not mistaken,do you still have a pair of BC ref600m.

No don’t own them, but of all the D’s I have heard they were the best, "BUT" only when they drove an expensive Raven ribbon tweeter’ed two way bookshelf. This Raven has a very benign flat 4-6 ohm load and not much -phase angle to contend with, the whole speaker was an easy drive.

If so what amps do you like better and what speakers do you use.

A pair of these ME1500’s the one for the esl panels in 100w class-A mode the other for the bass in 25w Class-A mode.
And highly modified bass Martin Logan Monolith III with the newer aluminium vapour deposited Neolith esl panels.
http://www.stereo.net.au/forums/topic/109666-reading-specs/?do=findComment&comment=1689719

I also loved the sound of these on a pair of Quad ESL57's, but you've only got 25watts.
http://www.audiocostruzioni.com/r_s/ampli/amplificatori-finali/mark-lvinson-ml2/mark-levinson-ml2.html  


Cheers George

George,

Not only is it 1ohm @100hz, but it has a massive -90 degree phase shift at 100hz also, these two together mean almost a dead short as see by the amp. 

Where do you get your data on the Scintillas?  I owned a pair and measured the impedance magnitude and phase (scroll to the bottom):
http://www.lippaudio.com/apogee-scintilla/

No 90 deg phase shift at 100 Hz.  A very well behaved 1 ohm in that region.

- John