Dunlavy SC IVA X-over resistor values

John Dunlavy's placement recommendations:

Yes, John typically suggested long wall placement. This was (in part) to maximize speaker placement from the sidewalls. He recommended greater distances from sidewall to the center axis of drivers than from the front wall (long wall) to the front baffle board. Also he called for toe-in aimed just behind the listener's head.

However he did not recommend anything near 120 degree separation between speakers. He specified 45-70 degrees with 60 being the optimum. In fact he preferred an equilateral triangle placement of speakers relative to the primary listening seat. But since he also specified a 3-3.5 meter listening distance (for full convergence of drivers on his floorstanding designs), this results in greater physical separation of the two channels than some designers recommend.

My listening experiences with both DAL and Duntech speakers bears out the benefits of avoiding close sidewall placement.

And . . . I don't feel cross threaded on this at all. I just wanted to understand your perceptions on dispersion.

However he did not recommend anything near 120 degree separation between speakers.

You are quite right - I am not sure where I got that idea - that is way too far apart - I don't think I have ever seen them setup that way - my bad!

Dear All,

Again thank you. Unfortunately or maybe fortunately my speakers are very limited where they can go. This is because they are used in my studio to make digital masters and produce my jazz radio show. In fact I never sit down and there is no chair to sit down. I work standing up at a digital workstation which has a stand up desk. My speakers are on the long wall about 8 feet apart and about 2 feet from the left side wall and about 4 feet from the right side wall (this imbalance is not optimum I am sure). And about 4-5 feet from the back wall. Yet for some reason this sloppy placement (by necessity) sounds wonderful. The speakers are world class sounding. I listen anywhere from 12 to 25 feet away depending on what I am doing in the studio. At 25 feet they sound slightly better. I can hear the smallest changes in sound. I am sure others in this forum have a much better set up as this is really rinky dinky (except for my floor which is very very thick concrete with indoor/outdoor carpet over it. But this placement works for whatever reason and the sound is quite good. And getting better as I make minor upgrades such as the brass screws, cardboard on top, etc., as described earlier in this forum. Any suggestions I'll try and implement but I have limited maneuvering room. Jonathan

Dear All Dunlavy SC IVa Owners,

Has anyone come up with other improvements to the SC IVa since our last thread of Sept 2008? I have since added Walker Feet under the bases of the speakers to good result. And I have added two Sunfire MK IV subwoofers but set at a very very low frequency (25Hz) and at a very low volume so they just add a touch of low base. This opened up the midrange nicely. My normal experience with subs has not been good, so this surprised me. No other changes since Sept 2008. Hope to hear from all of you again.