dhsettim

Hi Jimjimbo, i would be interested in buying a couple of your 833s. I have a high feedback design underway based on Frank Blohbaum's Multiplied Transconductance Amplifier (MTA) philosophy. 1500V @ 180mA into 5K:6R OPT Contact me off list if interested timgrindell(at)gmail.com stay safe tim

Thanks for the comments guys, I had forgotten about the passive radiator versions when I posed my question. I guess I was thinking more along the lines of DJK's mod to the La Scala bass bin as I understand the back chamber of that (and the Khorn) are marginal in volume. I thought maybe the Jubilee back chamber might also be improved. cheers tim

Has anyone (and I guess I mean DJK) thought of porting a Jubilee clone bass cabinet? It seems to me that it is not dissimiliar (very roughly) to the La Scala bass bin and DJK has described successfully porting that speaker. Just thinking....... regards, tim

Guys, Can the DHA-2 crossover be used with an 8 ohm squawker driver (Coral M100), or can it be scaled for the different impedance? I'm presently using a Type A crossover with new parts but it doesn't allow me to change autoformer taps, easily. My intention is to use Al K's tweeter attentuator transformer rather than the DHA-2's tweeter protection. thanks to all. tim

Guys, On my 1977 Khorns I'm currently using a DIY 1st order Type A crossover using the UTC 3619 autoformers. I have also replaced the Klipsch mid driver with a Coral M-100 compression driver. (DJK says this is a Japanese copy of the JBL 2410) It is an 8 ohm driver so I vary between using the 0--2 (9.5dB) and the 1--4 (7.4dB) autoformer taps. (I have assumed that the attenutaion for the type A is the same as Al K has posted for his Universal type AA--which I also sometimes use) However I feel I would like attenutaion somewhere between the 7.4 dB and the 9.5 dB of the above taps. Is there some way to do this that isnt too complicated? Thanks for all and any advice, tim

Thanks for your very kind offer John, but looks like DJK has put the stops on that idea. Wow, what an amazing mine of information thank you DJK. I might just stick with the ALK universal as I know and like it until I can actively crossover. But then again the temptation to tweak is strong........ thanks y'all tim

Thanks John and Everyone, My K55 has the push terminals. Are they the problem drivers? My thought was the any 9 KHz peak would probably not be present with a different driver. I'm afraid I don't have the abilty to design a new crossover for an 8 ohm driver so likey to just stick with the ALK.......until I can go active.... It is a while now since I listened to the K55 vs the Coral but I remembeer the Coral being sweeter and more detailed. I'm not good at describing HiFi changes....they were just better. The details I have on the driver a very sketchy but from a frquency response graph that was fuzzily posted on the net I think it is more like 400 to 18K. Showed it to be smooth to 18K with rapid drop ater that but I have no way of knowing how acurate it is. I did try TAD2001 briefly and even tho' they are supposed to go to 22K I still felt a tweeter was necessary. In the end I may just try the Type A with the 8 ohm Coral and justsee what happens. Anyone got any recommendations for active crossovers? thanks, tim

I am currently using an ALK Universal Xover on my 1977 Khorns, but with a Coral M-100 alnico 1 inch squawker driver. It is 105dB and 8 ohms, so I have found the 4-1 taps to sound best with my system. Some time back I made up a Type A Xover with good quality parts (as I had read that both Bruce Edgar and PK both preferred it) but I found some harshness which I assumed was the 9 Khz peak that has been described, and went back to the ALK. I'm not sure if I was using the Coral at that stage. I want to try again so can I successfully use a 8ohm driver with the Type A, and would the autoformer taps be the same? (Eventually I want to crossover higher as the Coral is said to go up to 18 KHz). I know, I know... try it and see...but I don't always trust my ears....... thanks y'all tim

Y'all, for those using tweeters with Baby Cheeks what are you filling them with? I used childs "playdoh" but it dried out. I though perhaps trying blutack, or similar. Suggestions? thanks, tim

ALK, I know ya won't be reading this but my thanks go out to you. I use your Universal Khorn crossover so have plenty to thank you for. Go well. tim

Hi Dana, hasn't Bill Fitzmaurice done a lot of designs with "ported horns"? Lotsa articles in Speaker Builder and AudioXpress, and I think he frequents the AA High Efficiency forum. best wishes, tim

Great work Al, as always. Ya just need to do the sums for a 1.5 inch throat and then everyone will be happy. Have a great Festive Season, tim

Thanks everyone, especially JW Cullison. It seemed like a good idea as it was easily reversible but it seems that it won't work. Ok, onto the next idea. tim

Hi Ya All, someone mentioned recently adding a 2nd woofer to the rear panel of a Heresy. They said to wire it out of phase but I would like to try it in phase to help cancel mechanical forces. Has anyone actually done this mod, and what changes need to be done to my Type E crossover to make it work. Thanks, tim

Hi Al, "I have a friend using the TAD 2001 on his Khorn". Have you heard his TAD 2001s? What do you think of them? Any good? regards, tim