I could use some advice on matching surround back speakers to my SDA-1Cs for a home theater setup.
By way of background let me describe my current setup and what Iím trying to achieve. Weíve just moved into a new home and I plan to upgrade my home theater which is comprised almost entirely of Polk Audio speakers. Iím running a 7.1 system with a Lexicon MC-8 processor and 220 watt Parasound amplifiers on each of the seven channels. Iíve got SDA-1Cs that I bought new in 1987 that I plan to continue to use as my mains. While most serious home theater enthusiasts might replace of these elderly speakers, I have an emotional attachment to them that defies logic. They are unmodified and have their original drivers. They are matched with a CS400I center channel, f/x500is for the side surrounds and two M3Iis in the rear for my surround back channels. The only non-Polk is a Carver Knight Shadow subwoofer which is very similar to Sunfireís smaller subwoofers. (My signature below links to a description of my old setup.)
Iím prepared to upgrade to higher performance speakers (such as the LSis) but not ultra high-end. As far as matching my speakers I am not very familiar with the various types of compatible tweeters. However, based on information that used to be posted on the Polk Audio web site, I am fairly sure that my center channel and side surrounds match up with the SDAs. For my first upgrade I was planning on replacing the M3IIs on the rear wall with high performance In-Wall speakers. I also plan to upgrade my subwoofer to two tube type subwoofers (HSU or SVS).
Since Polk has started to manufacturer higher performance speakers I naturally thought I would go with their new line. All my speakers will be hidden behind acoustically transparent walls or in columns. To hide the rear speakers I first considered the LC265is In-Walls (20Ēx8Ē)which are supposed to timber match with Polkís performance LSi series. However, after talking to a local high-end dealer, who I was surprised to hear was familiar with SDAs, I now realize that it is likely the tweeters in the LSi and LCi line will not match with the SDAs.
The dealer suggested some fairly small (10Ēx7Ē) In-Walls made by Snell Acoustics at $550 a pair. These have 1Ē textile (Kortec) dome tweeters which the dealer thought would match with the SDAs. They donít have back boxes and the tweeter don't swivel.
Snell of course makes larger, fancier In-Walls with sealed enclosures about the size of Polkís LC265is that go for $1,800 a pair. Iíd like to go bigger, but $1,800 could be a waste of money since the speakers will be behind the listeners and human hearing isnít as acute coming from the rear.
Iíve also considered Polkís mass-market In-Walls, the RC85is (14Ēx10Ē) at $390 a pair. They have metalized soft dome tweeters that swivel. They donít have back boxes, but the tweeters pivot.
I apologize for the lengthy posting, but I would greatly appreciate any advice regarding suitable rear surrounds that match up with SDA-1Cs, either the speakers I've mentioned or others.
Thanks in advance.