drboar Posted December 12, 2018 Share Posted December 12, 2018 The LS have a peak that seem hard to get rid of. If one used a HH chamber or a pipe resonator to reduce that peak things would be better for home use of the LS. In PA use I can imagine that any contraption that reduce effiency is a bad thing but at home were the LS hardly goes on at full blast hours on endThe LS has that midbass? Quote Link to comment Share on other sites More sharing options...
Deang Posted December 12, 2018 Share Posted December 12, 2018 It’s not a peak - it’s the sagging response below it that causes it to be more noticeable than it otherwise would be. I’ve been told that using the K-43 helps, but I’ve never seen a curve. 1 Quote Link to comment Share on other sites More sharing options...
Coytee Posted December 12, 2018 Share Posted December 12, 2018 Not knowing too much about this stuff..... would Roy's PEQ at 148 Hz be of help? 148 Hz, Q:8, -7 db This is of course, for active settings Quote Link to comment Share on other sites More sharing options...
KlipschFan61 Posted December 12, 2018 Share Posted December 12, 2018 I always thought that peak was my La Scala trying to add a bit of its own 'voice' to the music. 😁 Quote Link to comment Share on other sites More sharing options...
garyrc Posted December 13, 2018 Share Posted December 13, 2018 My first reaction was, "Sure, why not use a Helmholtz?" Is the peak, or the sagging response below that Dean mentioned, audible from the sweet spot only? If so, have you tried moving the sweet spot or the speakers? Have you assessed the room for modes? I have two La Scala graphs that PWK ran and a Belle graph I ran with REW and a calibrated mic. One is the graph Dean posted. To my eye, the peak looks like it is at about 175 Hz, but relatively narrow, about 1/3 octave, so it might be hard to hear, if that notion still holds. The second graph is the one in PWK's paper presented at the Spring Convention of the Audio Engineering Society, April 1965. In that one, there is a broad peak relative to average elevation. It is 2 to 2.5 dB in magnitude, and reaches from 100 Hz to about 250 Hz. But it is not a peak relative to the 1K area. The Belle Klipsch is advertised as being similar to La Scala, but I don't know how similar. My Belle center channel, in my room, has a 1.7 dB peak from 100 Hz to just about 140 Hz. Quote Link to comment Share on other sites More sharing options...
Marvel Posted December 13, 2018 Share Posted December 13, 2018 I thought the peak was caused by the parallel walls in the side channels. Does the Peavey FH-1 also have the peak? Bruce Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted December 13, 2018 Share Posted December 13, 2018 21 minutes ago, Marvel said: I thought the peak was caused by the parallel walls in the side channels. Does the Peavey FH-1 also have the peak? Bruce Yes, to a lesser degree and it's a bit lower freq. and amplitude, but not much. Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 14, 2018 Share Posted December 14, 2018 Perhaps. Maybe too much smoothing here. Helmholtz resonators usually have very deep cancellation troughs. Quote Link to comment Share on other sites More sharing options...
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