cheric Posted May 17, 2014 Share Posted May 17, 2014 (edited) Is this the newer version of the Selenium D250X? Price is good. I would like to hear from you guys before making a purchase. http://www.parts-express.com/selenium-d250-trio-1-phenolic-horn-driver-1-3-8-18-tpi--269-380 Product Specifications Mounting Type1-3/8"-18 TPI Exit Diameter 1" Diaphragm Material Phenolic Impedance8 ohms Power Handling (RMS)175 Watts Selenium D250-TRIO 1" Phenolic Horn Driver 1-3/8"-18 TPI Brand Selenium Model D250-TRIO Part Number 269-380 UPC 7896359520800 Weight 6.7000 lbs. ----------------------------------------------------- Selenium D250-X specs... http://www.parts-express.com/selenium-d250-x-gw-1-phenolic-horn-driver-1-3-8-18-tpi--264-204 Product Specifications Mounting Type1-3/8"-18 TPI Exit Diameter1" Diaphragm Material Phenolic Impedance8 ohms Power Handling (RMS)150 Watts Selenium D250-X GW 1" Phenolic Horn Driver 1-3/8"-18 TPI Brand Selenium Model D250-X GW Part Number 264-204 UPC 7896359515684 Weight 2.7 lbs. Edited May 17, 2014 by cheric Quote Link to comment Share on other sites More sharing options...
ClaudeJ1 Posted May 17, 2014 Share Posted May 17, 2014 Based on the curves alone, the X is better Quote Link to comment Share on other sites More sharing options...
pzannucci Posted May 18, 2014 Share Posted May 18, 2014 Yes, what is a trio.... Third in the blood line? The x can sound very good especially if you fix the hollow chamber. Quote Link to comment Share on other sites More sharing options...
justinsweber Posted May 18, 2014 Share Posted May 18, 2014 what do you mean by hollow chamber? I use a set of the 250X and would love to know any improvements which can be made. Quote Link to comment Share on other sites More sharing options...
Schu Posted May 19, 2014 Share Posted May 19, 2014 I think this part: compression driver with a lightweight, strong phenolic diaphragm Quote Link to comment Share on other sites More sharing options...
djk Posted May 20, 2014 Share Posted May 20, 2014 "Is this the newer version of the Selenium D250X?" It's a POS, the standard D250X is far better (look at the terminated tube graphs on both). Quote Link to comment Share on other sites More sharing options...
pzannucci Posted May 20, 2014 Share Posted May 20, 2014 what do you mean by hollow chamber? I use a set of the 250X and would love to know any improvements which can be made. If I remember correctly, the back of the driver is just hollow. To avoid the possible influence at certain frequencies of the chamber and notches or noise from the chamber, I added foam padding into it. The 250x can sound very good, price notwithstanding. Mine are connected to 511's with a small amount of foam layering a portion of the horn throat to remove some echo on horn entry. Mids (600-4K+) are better than many horns I have heard. Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 9, 2015 Share Posted August 9, 2015 (edited) - uh - DJK - here's one of mine stock on a 511B - I'd like to make use of it vintage 16 ohm University Sound SA-HF vs stock Selenium D250 Trio 8 ohm driver on an Altec 511Bin-room each with 25uF highpass - what's a good inexpensive tweeter to mate with 511B/D250 Trio looks like the Selenium needs a "P-trap"1/6th octave1/24 octave Edited August 9, 2015 by karlson3 Quote Link to comment Share on other sites More sharing options...
djk Posted August 10, 2015 Share Posted August 10, 2015 You need something that goes to 2Khz so it can be crossed at 3Khz. http://www.parts-express.com/prv-audio-wg11-25-b-90-x-60-abs-waveguide-2-3-bolt--294-2846 http://www.parts-express.com/tymphany-dfm-2535r00-08-1-compression-horn-driver-2-4-bolt-8-ohm--264-1420 or http://www.parts-express.com/celestion-cdx1-1445-ferrite-1-compression-driver-20w--294-2120 Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 10, 2015 Share Posted August 10, 2015 hi DJK - thank you very much for those suggestions - that's a cool PRV waveguide - I've got some polyamide Dayton and BMD-440 which should work - would a Type A network with a larger tweeter cap be sufficient for good results? Quote Link to comment Share on other sites More sharing options...
djk Posted August 10, 2015 Share Posted August 10, 2015 The D250 Trio drops 20dB in the octave between 3Khz and 6Khz, I would probably use an 18dB Butterworth 3.2Khz crossover on the tweeter (4µF + 0.3mH + 12µF). It wouldn't hurt to try a 6dB if using low power, try values between 4.7µF and 6.8µF and see how it turns out. A 'P' trap may be in order too (77µH + 3µF), that 15dB peak around 9.7Khz looks nasty. Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 10, 2015 Share Posted August 10, 2015 (edited) yeah - a peak like that besides nasty can add an unwanted extra spatial source - I'll have to get some coils and caps. hmm - I just tried a 3.3uF cap with 100uH inductor and it really took that 9K7 peak down - that introduced a new but more bearable peak around 12K4 (IIRC) for someone wanting an inexpensive project, if the regular X version and this have sufficient power handling, then one might make a Belle or LS ~ stock or vented along with that Tymphany CD or maybe the ASD1001B (bolt). I once laid out a one 4x8 sheet Belle type but lost the drawing. is there any point or possible with a few components to further continue the ~18dB slope of the D250 Trio and retain the 9K7 notch filter? - components are just haywired together til I get some alligator leads Edited August 10, 2015 by karlson3 Quote Link to comment Share on other sites More sharing options...
djk Posted August 11, 2015 Share Posted August 11, 2015 Maybe a low-pass at 3.2Khz with a Q=1 would work better (0.5mH + 7.4µF). Should give about 1dB of lift around 3Khz, and 24dB of cut around 12Khz. Skip the P-trap. Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 11, 2015 Share Posted August 11, 2015 (edited) thanks - think I've some heavy 0.55mH coils laying around - maybe the same lowpass would work on the 630SS/JBL waveguide combo (?) Edited August 11, 2015 by karlson3 Quote Link to comment Share on other sites More sharing options...
karlson3 Posted August 12, 2015 Share Posted August 12, 2015 (edited) here you go DJK at 1/24 octave then same data at 1/6 octave smoothing vs the previous 25uF plus 3.3uF parallel with 100uH "p-trap" - I used parts laying around 0.55mH and 6.8uF +25uF - whadya think? with 497Hz sine input at a fairly loud level (reletive to being obnoxious at 4am) , H2 is 61.5dB down and H3 down further Edited August 12, 2015 by karlson3 Quote Link to comment Share on other sites More sharing options...
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