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You guys are killing me as my Jan issue is not here yet.
Kal should chime in here, but it has been my understanding that you need to crossover at or below 70hz to keep from localizing (knowing) where the sub is placed in the room. I also think it makes sense if possible to have the sub enter where you main speakers start to loose their output. Unless you have some small bookshelf speakers you should be able to get to 50 HZ with little reduction in output power.
Thie is where the Stereophile test cds come into play with tones down to 20HZ. A great pair of monitor/bookshelf speakers (Triangle Comets or Titus?) with a good sub can be very magical.
ps Do not rely on the speakers crossover control HZ markings to be accurate. I have seen variations 30+ HZ to where the actual control kicks in.
Yeah, I ask because I've heard both the 4s and 5s, and the latter sound much fuller. I don't want to guess how low they go, but certainly a significant amount lower than the 4s.
Was hoping for a response from John on this.
But, FWIW, I ended up buying the Era 5s and a single Sub 10, and am crossing them over at 60hz. Still seems to me a more sensible and cost-effective combination than the 4s and two subs.
Sure. Of course, a lot depends on the room setup and using 2 subs lets you put them close(r) to the main L/R speakers. That compensates greatly for a high crossover. Dr. Hsu does similar in some of his arrangements.
Kal
My apologies for the very tardy response. I have always had a hard job getting a satisfactory result from just one subwoofer, so decided from the outset to go with two for the Era review.
John Atkinson
Editor, Stereophile