What Class D amps will drive a 2 ohm load

Just asking.

I see specs into 4 ohms but nothing into difficult speaker loads (like Thiel CS5's).

Thanks for listening,

Dsper

dsper08-25-2019 12:17am

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georgehifi Details Discussions Posts This discussion 10,312 posts 10-23-2019 at 01:41am Copy Comment URL Report Comment Edit Delete joysjane Don’t think your gunna like this It seems the WFS SX-1000 uses the same B&O 1000ASP ICEpower module as the Bel Canto Ref1000M monoblocks. Stereophile say they turned them selves off when presented with a 2ohm load, which easier than the Kappa 9’s load which is a below 1ohm horror load. "Ref1000M monoblock offers very high power from its diminutive chassis. It does work best with higher-impedance loudspeakers" Maybe it’s time to sell the Kappa 9 if you really need to go class-D My friend with Infinity Renaissance 90 little easier load than the 9’s was trying to do the same with Class-D’s, didn’t work out either, went back to his big Krell, which luckily he didn’t sell. Cheers George
golfnutz Details Discussions Posts This discussion Message User 231 posts 10-23-2019 at 02:08am Copy Comment URL Report Comment Edit Delete Yep, WFS SX-1000 uses those same modules. Spec sheet specifies 2.0 ohm minimum load, as well as 40 amp current (peak). Unlike the Icepower 1200AS1/2 being rated at 2.7 ohms. Also included in the specs: Overload Protection - In case of high-amplitude continuous low frequency signals in loads lower than 4 ohms the power supply may not be able to deliver the required amount of power to the amplifier and the supply voltage will drop. The overload protection circuit will then lower the threshold of the input soft clipping circuit until the output power has been reduced to an acceptable level. As a result the amplifier will not shut down because of under voltage and the music will still be playing but with a softly shaped audio signal.
dsper OP Details Discussions Posts This discussion Message User 663 posts 10-23-2019 at 08:21am Copy Comment URL Report Comment Edit Delete Hi joysjane, FWIW as it might not be the same animal, I have a five year old W4S ST1000 and it could play Maggie 3.6's loud but with no control of the bass. It had trouble with Thiel CS3.6's and was a joke with the CS5's. In my set-up, a Coda CS (300 WPC 8 Ohms, 600 wpc 4 ohms) did much better but got constrained/harsh with the CS5's at higher volumes. My current amp, a McCormack DNA-500, is effortless with the CS5's. Any change now would be to eliminate my perception that I think I still hear a bit of grain or there is a lack of the sound coming out of a black silence. Based on listening to a X350, Pass might be better but they are hot and huge. Again, FWIW. Thanks for listening, Dsper
golfnutz Details Discussions Posts This discussion Message User 231 posts 10-23-2019 at 11:11am Copy Comment URL Report Comment Edit Delete It had trouble with Thiel CS3.6's and was a joke with the CS5's. So the Icepower 1000ASP had trouble with Thiel CS3.6. Well, they are a tough load through most of the frequency range. The 1000ASP should have an easier time with the Thiel CS3.6 than the 1200AS1/2 since the ratings are 2.0 ohm minimum load and 40 amps peak, vs 2.7 ohm and 38 amps peak for the 1200AS1/2. The 1200AS2 didn't pair that well with my Wilson Watt/Puppy's. If you compared the 1200AS2 to my Class A amps, it was no contest really. To be honest, I'm not sold on what @cascadesphil is saying about his EVS1200 amp being suitable for his Thiel CS3.6 speakers(based on Icepower 1200AS1 modules). I suspect he is using subwoofer's and this is masking the issues. It's too bad he never had a decent amp as a reference point to compare. Both his previous amps weren't sufficient for those speakers either. He should have paid attention to the Stereophile reviews for those amps as they were only mediocre. This is just my opinion. I'm sure the Icepower 1200AS1/2 do well with higher impedance speakers.
joysjane Details Discussions Posts This discussion Message User 165 posts 10-23-2019 at 08:18pm Copy Comment URL Report Comment Edit Delete Oh hell no... The Kappa 9's are my last pair of speakers. Will be selling my Legacy-Audio Focus & Infinity Prelude MTS' some time in the near future. My KSA Krell is great for the winter as we live in WY. I switch to the PL WOPL's for the rest of the year. They both make the Kappa 9's sing... And they damn well better! KSA rated to 4kw @ 0.5 ohm with the Claire Bros WOPL's testing to 513w per channel to 8 ohm. That's over 1kw per channel @ 8 ohms of Phase Linear bi-amp power that's sweet as honey! At eight-hunge for the two 1000's it's worth a go. I seriously doubt they can compete with my amps but, it'll be fun to see what Class D amps sound like w/the 9's. I'm intrigued by the small package & lack of weight. It's just a curiosity thing. I'm pretty sure the Kappa 9's are gonna suck/inhale these two mono blocks half way into the speaker cables, good thing I have some large ones, and pull my power cables tight on the outlets! Bahahahaaaaa...... Hey dsper... Huh, don't those Class D amps have a Damping Factor of 1000? That surprises me. I would have thought they would start to get harsh on the upper mids and higher freq's.

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