I'm working on a project, and would like some advice, tips, or suggestions from the esteemed members of this forum. One of the things I've been playing around with is the idea of a center channel speaker to go with my various SDAs. Along the way, what I've decided is that from a timbre-matching point of view, almost every recommendation seems to suggest using a single CRS+ speaker. As some have observed, recently including Darqueknight here, the problem is that their proportions make it difficult to physically place them in their factory configuration. They simply are too big. What I've decided to do is to create something different, and I've begun planning it out, have acquired many or most of the parts, and am going to see how well it works. As I build it, I will take pictures so that I can provide a more complete build post. While I'm yet to build the first bit, and before I've committed to the way it will be built, I thought I'd ask for opinions, advice, and suggestions. I'll be happy for any, including those of the "don't bother" variety. Here's what I'm planning:
My television currently sits on a low flat rack. Its top, on which the TV rests, is removable glass over an aluminum tubular frame, and is approximately 24x40, although it is curved on the front edge, going from roughly 24" at the center to 21-1/2" at the sides.
Much has changed since this picture was taken, including the TV and the SDAs pictured would no longer be in the picture, and there is different hardware generally. The point is to show you WHERE my project is intended to land.
My goal is that whatever I build will not add more than 9 inches in height to the placement of the television. What I am intending at present will involve using the drivers and the tweeters from a pair of (1986) SDA CRS+ arrayed in a single horizontal line (the mids are MW6510s and the tweets are sl2000s). The left and the right will be on opposing sides of the curve of the front, so they will be on slightly different planes. I was left with a bit of a conundrum with respect to the passives, as there are a number of ways I could do this. What I am going to try first is to place a line of 4 6.5" passives across the back, and two on the sides(near the rear.) The cabinet will be divided left from right, and the way I'm building the center section, I will leave room for a crossover network and I will remotely mount the various inductors apart from the 0.4mHs in the tweeter networks. The 1.75mH and 1.5mH inductors for each speaker will be placed in various locations in the center space. The two 5.6mH inductors will be placed in a pocket on either side. The general layout will look like this:
My initial intentions with the crossover network are to essentially build the crossovers of two CRS+ speakers on a single board. I intend also to place a switch with which I can flip between stereo mode(utilizing the SDA circuit) when I have only the TV on, or in center channel mode if I'm using the HT preamp. In fact, I've thought that what I might do is to use a 12vdc triggered relay to make that switchover. If the HT preamp powers on, the 12vdc trigger will fire, and click, we're in center channel mode. Otherwise, it remains in SDA mode and that's the extent of it.
Cosmetically, I will wait to apply veneer&cloth until after I decide the final arrangement. In any case, I will be going for an SDA-like appearance, much in the style of the SRS's. I'll be doing some of the initial mock-up this or next weekend. In terms of the guts, I've gotten some less expensive capacitors from VR3, who has been very helpful. I'm getting some 5.6mH inductors from him for this project, as well as the other upgrades I'm slowly going through. In the end, I don't want to have spent a ton of cash on this until I have some indication that my "sda-in-a-box" will sound ok.
Okay, well, that's the current project here. Fire away...LOL