Al Klappenberger Posted May 18, 2006 Share Posted May 18, 2006 Guys, From what everybody is saying about that driver is that it might be ok when used with Bob's tweeter and a 4500 Hz crossover, but I can't see it as an "upgrade". The only reason I could see buying one is if you are building a Khorn "clone" and can't afford an Atlas PD-5, and that doesn't make much sense! AL k. Quote Link to comment Share on other sites More sharing options...
Deang Posted May 18, 2006 Share Posted May 18, 2006 Yeah, that's the bottom line really. Quote Link to comment Share on other sites More sharing options...
cjgeraci Posted May 18, 2006 Share Posted May 18, 2006 "excellent report....it would also be intresting to get a report from someone who has AL's wooden trachorn" About their experience running some of these Selenium drivers with Trachorns? Might be difficult to find a guinea pig. Many Trachorn owners, myself included, are pretty pleased running Trachorns with stock K-55s and have no more desire to experiment with our squawkers. We are there. That being said, the only change I would ever contemplate with Trachorns would be going to a set of JBLs. Carl. Quote Link to comment Share on other sites More sharing options...
BEC Posted May 18, 2006 Author Share Posted May 18, 2006 Guys, From what everybody is saying about that driver is that it might be ok when used with Bob's tweeter and a 4500 Hz crossover, but I can't see it as an "upgrade". The only reason I could see buying one is if you are building a Khorn "clone" and can't afford an Atlas PD-5, and that doesn't make much sense! AL k. But, if one can save close to $200.00 on a pair of DIY speakers, that is not insignificant. That is usually a lot of what DIY is about in the first place. Just depends on what one has to give up to get that savings. Jury is still out on that for these drivers. Seems we get an extra 100 hz usable response on the low end compared to the PD-5VH and give up some on the top. Crossing from mid to tweet first order at 4500 may cure the give up on the top. Bob Crites Quote Link to comment Share on other sites More sharing options...
DrWho Posted May 18, 2006 Share Posted May 18, 2006 About their experience running some of these Selenium drivers with Trachorns? And if one were to venture into the realm of purchasing a new compression driver it would be better to go the route of a 2" driver instead of 1.4" - there is way more selection and in my opinion both room for better performance and more bang for the buck... Quote Link to comment Share on other sites More sharing options...
Guest " " Posted May 19, 2006 Share Posted May 19, 2006 I hear you...... so far some listening has occurred in a 401 horn and some specs have been collected....some value judgments on the spec's as well. I think though I have to agree with Bob....while many folks have k-55's and some have moved to 2" drivers and back (I had 2" ACR drivers in the late 80's on 30" bi-radial wooden horns that sat on the top of ACR Eckhorn k-horn clones made of furniture grade mahogany plywood powered by a pair of bridged SAE 501 250 watt per channel amps), referring folks to hunt down used k-55-v push-pin or terminal types, k-55-ms, k-55-x's, speakerlab HD350's, Atlas PD-5VH's on ebay is a little more adventurous for some than referring them to partsexpress to pick up a pair of drivers at a third of the cost. Issue of the listening test is to get away from the spec's and measurments and do the test drive.....I am sure many will be humored by the possiblity that a 37.50 driver might sound good and I am sure many would not want to ever acknowlegde that such a possbility could ever exists. I think is great that folks are open-minded and are trying to develop informed options for others. Quote Link to comment Share on other sites More sharing options...
Tony Reed Posted May 21, 2006 Share Posted May 21, 2006 Bob (BEC), I'm considering purchasing a pair of these drivers. Now that you've had a few days to experiment, what is your opinion of them? Tony Quote Link to comment Share on other sites More sharing options...
BEC Posted May 21, 2006 Author Share Posted May 21, 2006 Tony, I have been too busy on other stuff to play with these drivers in the last few days. I can see them working in some instances where you can cross over to a tweeter at 4500 hz or so and attenuate them a bit to match the tweeter. I don't think they are a "drop in" replacement for any Klispch speaker, but may be useful in a DIY situation. If enough people are interested in trying these drivers, I can do a wholesale buy on a bunch to get the price even better. Bob Quote Link to comment Share on other sites More sharing options...
Tony Reed Posted May 30, 2006 Share Posted May 30, 2006 Bob, Anything new to report on this driver? Tony Quote Link to comment Share on other sites More sharing options...
BEC Posted May 30, 2006 Author Share Posted May 30, 2006 Yes, as a matter of fact, I ran some traces on it yesterday. As you can see from the trace, it does pretty good from about 300 hz to around 4 khz. The dip at 3 khz is not really there, some sort of cancellation going on there. It has about 3 db more output than a K-55 over most of the range. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted May 30, 2006 Author Share Posted May 30, 2006 Here is a trace of the 3 types of K-55s tested also yesterday with exactly the same test setup as the D250X. Again the 3 khz dip is not really there. This shows the relative outputs of the 4 drivers with exactly the same voltage inputs and on the same K-400 horn. Bob Quote Link to comment Share on other sites More sharing options...
Tony Reed Posted May 30, 2006 Share Posted May 30, 2006 Bob, Thanks for the info. I think I'll order a pair to play around with. Tony Quote Link to comment Share on other sites More sharing options...
Tony Reed Posted August 8, 2006 Share Posted August 8, 2006 Mr. Bob (BEC) What do you think of this driver now that you've had some time with it? I just got mine and they seem awfully "hot" compared to the drivers I'm used to hearing. Tony Quote Link to comment Share on other sites More sharing options...
BEC Posted August 8, 2006 Author Share Posted August 8, 2006 Tony, Yeah, I think they are about 3 dB higher than the K-55. Need to attenuate them about that much if you are using them in place of something about the sensitivity of the K-55. I plan to build some Heresy size boxes sometime when I get time to do it and try these drivers in them. By the way, Parts Express says now that they are discontinued. Don't know if Selenium quit making or PE just stopped stocking. Bob Quote Link to comment Share on other sites More sharing options...
freddyi Posted August 8, 2006 Share Posted August 8, 2006 HI Bob - I think the D250-X 'packaged pair' stock # is discontinued but individual units still up (?) http://www.partsexpress.com/pe/showdetl.cfm?&DID=7&Partnumber=264-204# Freddy Quote Link to comment Share on other sites More sharing options...
BEC Posted August 8, 2006 Author Share Posted August 8, 2006 Freddy, Yes, guess that is right. Looks like the same price anyway. Bob Quote Link to comment Share on other sites More sharing options...
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