kg4guy Posted March 11, 2009 Share Posted March 11, 2009 I purchased a pair of these for $400. pair with a extra set of diaphrams they are near mint condition I was going to use them in my Cornscala project. Quote Link to comment Share on other sites More sharing options...
sfogg Posted March 11, 2009 Share Posted March 11, 2009 I have used the288-8k, very nice drivers. Make sure you use them with a 1.4" horn. If you are using them in a three way Cornscala push the tweeter crossover up high. I crossed at 8k to JBL 2404s and that worked out well. Shawn Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 11, 2009 Author Share Posted March 11, 2009 I was going to use the 511B's so I guess those will not work.The guy has some 803B horns in mint condition I took them home but wasn"t sure if I was going to keep them because of there size. Quote Link to comment Share on other sites More sharing options...
sfogg Posted March 11, 2009 Share Posted March 11, 2009 511Bs are for 1" throats. The same horn with the proper throat for the 288 is the 511E. They are rare and hard to find though. 803Bswill be very large horns. 300hz cutoff with an 80x40 dispersionpattern. I used my 288s on 805Bs. Same dispersion but smaller with a500hz cutoff. They are fun horns, they have a big sound to them. Shawn Quote Link to comment Share on other sites More sharing options...
johnellis Posted March 12, 2009 Share Posted March 12, 2009 The 288-16H was the last of the Alnico drivers and, like the G, fetches big bucks. Wonderful drivers! Shawn is right, the 805's would work great. If you're interested, I have some 311-60's that would work as well. Roughly the same size as the 805's. Possibly somewhat smaller. Quote Link to comment Share on other sites More sharing options...
djk Posted March 12, 2009 Share Posted March 12, 2009 I would consider the Altec MRII 594, or the EV HR90. These are of reasonable size, and have good HF performance, you may not need a tweeter. The Altec may be crossed at 500hz, the EV at 800hz. They are both compact enough (under 24" wide) to fit inside the cabinet. http://www.lansingheritage.org/images/altec/catalogs/1993-pro/1993-36.JPG http://archives.telex.com/archives/EV/Horns/EDS/HR90%20EDS.pdf Quote Link to comment Share on other sites More sharing options...
consistent Posted March 12, 2009 Share Posted March 12, 2009 Hi, I use the 288 16k and built my own tractrix horn...WOW! You may need to 'fiddle' with cross points or play with the 'time relationship' of drivers to seating position. To beat the odds I set up 2 amps and pres, one to drive the bottom end and the other to drive the 288 and Bob Crites tweet (replaced the K77). I found that the 288 had more 'overhang' with the bottom end than it did with the Crites tweet. If you get really good you could just use the 288 and the woofer. The 288 will go from 400 (500 more easily) to 17.5k with the right horn and cross. Good luck Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 12, 2009 Author Share Posted March 12, 2009 I may rethink what I am going to do with these I may put them on the back shelve for now and just use the 511B's with a K-55 for the Cornscalas and build a different system for these.[*-)] Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted March 12, 2009 Share Posted March 12, 2009 Maybe Parts Express has 1.4" horns? I think you should make em work. Probably a far superior driver to the K55. I've been comparing a pair of JBL 2441s (2" driver w 4" voice coils) I have to K55s and and a pair of Atlas siren horns. Siren and K55 near equal in sound quality. The 2441s put the singers in the room with you. I suggest going with the bigger drivers when you can. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 17, 2009 Author Share Posted March 17, 2009 Wow so the K-55's with Atlas horn are near as good as the JBL 2441's .I have noticed it hard to find a driver that has the db below 500Hz like the K-55's. Quote Link to comment Share on other sites More sharing options...
Professor Thump Posted March 17, 2009 Share Posted March 17, 2009 I would consider the Altec MRII 594, or the EV HR90. These are of reasonable size, and have good HF performance, you may not need a tweeter. The Altec may be crossed at 500hz, the EV at 800hz. They are both compact enough (under 24" wide) to fit inside the cabinet. http://www.lansingheritage.org/images/altec/catalogs/1993-pro/1993-36.JPG http://archives.telex.com/archives/EV/Horns/EDS/HR90%20EDS.pdf These were the horns that were typically used with the 288. It is a nice driver to use in the right horn/throat combination. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted March 18, 2009 Share Posted March 18, 2009 Wow so the K-55's with Atlas horn are near as good as the JBL 2441's .I have noticed it hard to find a driver that has the db below 500Hz like the K-55's. No, I said the two Atlas drivers were similar sounding. The 2441 is in another league and "puts the singer in the room with you".. Those 1.4" horns do show up on Ebay sometimes too. I noticed a 1.4" to 2" adapter on their the other day so that would be another way to skin the cat. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 18, 2009 Author Share Posted March 18, 2009 I am going to cut my 511Bs down to 1.4" and wield a new mounting plate with a 1.4" hole.I contacted Altec and they had said to not use a adapter that would go fom 1.4" to 1" as it may damage the driver .Also wondering about the crossover adjustments that I will need for this driver. I am running 2 k-33's with the 511B's with K-55's and a Eminence ATP 50 tweeter with a type A crossover with a 1.3mh inductor and 500Hz rather than 400Hz crossover point because of the 511B horn per speaker.(Cornscala dbbs) Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted March 18, 2009 Share Posted March 18, 2009 A pair of 1.4" horns ended yesterday on Ebay. I suggested going from 1.4 to 2" not down to 1". Although I'm suprised that going down to a 1" horn can "hurt" the driver? I wonder how? Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 18, 2009 Author Share Posted March 18, 2009 This is what he said in the email "the exit throat of a compression driver is reduced, the sound will be compromised and the physical impedance will load the driver with undue stress. " Quote Link to comment Share on other sites More sharing options...
Blvdre Posted March 19, 2009 Share Posted March 19, 2009 I am going to cut my 511Bs down to 1.4" and wield a new mounting plate with a 1.4" hole.I contacted Altec and they had said to not use a adapter that would go fom 1.4" to 1" as it may damage the driver .Also wondering about the crossover adjustments that I will need for this driver. I am running 2 k-33's with the 511B's with K-55's and a Eminence ATP 50 tweeter with a type A crossover with a 1.3mh inductor and 500Hz rather than 400Hz crossover point because of the 511B horn per speaker.(Cornscala dbbs) If you cut the horn down, you're changing the properties of the horn. Quote Link to comment Share on other sites More sharing options...
kg4guy Posted March 19, 2009 Author Share Posted March 19, 2009 No that is how they made the 511E with a 1.4" opening it was a 511B horn same width and height just not as long. Thanks Quote Link to comment Share on other sites More sharing options...
Blvdre Posted March 19, 2009 Share Posted March 19, 2009 No that is how they made the 511E with a 1.4" opening it was a 511B horn same width and height just not as long. Thanks No kidding? Doesn't seem right, unless they modified the flare. They should know though. Quote Link to comment Share on other sites More sharing options...
JL Sargent Posted March 19, 2009 Share Posted March 19, 2009 It would be interesting to see those two horns laid side by side. I wonder how weldable that horn material is. Quote Link to comment Share on other sites More sharing options...
Blvdre Posted March 19, 2009 Share Posted March 19, 2009 Took alook at a 511 online (been a while since I sold mine). I see it now. There's a slight taper at the rear of the horn before the flare starts. Quote Link to comment Share on other sites More sharing options...
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