Thiel Owners
but its anomalous behavior is limited to its stability into low impedences, BUT if it does become unstable, it tells you via indicators This may "save" the amp if the protection circuit is fast enough if it oscillates and there’s not too much storage capacitance, as you’d be crazy to put relays/fuses etc in the speaker outputs or power supplies. (another sound quality no no) I did say just one of the negatives was stability and low impedance drivabilty, there are many more. Cheers George |
When I get the AHB2 in monoWhen you do this the "sound quality" not the loudness will deteriorate. As when any amp is bridged, the there are many negatives that happen, one is that will be here is the ability to drive low impedances and the stability into low impedances. Look at the impedance graph of the 3.7's, it's nasty. If you need more watt's get a bigger amp. https://www.stereophile.com/images/archivesart/1208T37fig1.jpg Cheers George |
They are more like 2ohm, and at 60hz where the -phase angle meets the 4 ohm could represent even less EPDR load to the amp. https://www.stereophile.com/images/archivesart/1208T37fig1.jpg What the member who’s thinking of bridging should do if he must get another ABH2, instead of bridging it, which will be a step backwards with these CS3.7’s in all parameters except total wattage. He should vertical bi-amp the two ABH2 amps, that way the whole power supply energy is available to just one bass speaker of one channel instead of two. The amp/s remains stable and able to drive these nasty loads. https://www.av2day.com/wp-content/uploads/2014/05/biamp2.jpg Cheers George |
"The vertical bi-amp will not work with the Thiel CS3.7 since it only has 1 set of speaker inputs."Yes it's very easy to do, "if" the owner or a friend has a little knowledge. Once again do not bridge into these CS3.7's, you'll gain loudness at the expense of sound quality and reliability. This is stretching it, but bridging turns what was a good quality amp into a more powerfull P.A. amp. Cheers George |
This new video From Ayre Acoustics and John Atkinson of Stereophile is just in time to explain why the CS3.7 won’t be liked by many amps, "especially bridged ones." And not only because it's closer to 2ohm rather than 4ohm It’s got the discussed "equivalent peak dissipation resistance" (EPDR) which I mentioned a page back, which is the combination of -phase angle and resistance at a given frequency, in this CS3.7 case at 60hz where much power is needed. https://youtu.be/TRGrvd_cTHI?t=555 Cheers George |
