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JL Sargent

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Posts posted by JL Sargent

  1. Generally, I try to crossover where the polar response and distortion response are similar...this helps makes the transition less noticeable. Though it's always nice to cross not right in the middle of the midband (~3kHz) as our hearing is more sensitive in that region.

    Hmmm, that sounds good. I'm gonna investigate that. Maybe I'm smart enough to figure out where that is........

    Reading up on horns and it appears this one might be better for me. Reported with minimum crossover at 500hz.

    http://www.jblpro.com/pub/components/2380a.pdf

  2. Thanks for that link. Heck, they recommend crossing into it at 1000hz yet low usable freq 550.[*-)] On the active crossover I can go down to sub 400 before it starts to sound different to my ears. I've got to get me a mini-analyzer or similar. Ill have to think the horn over. I really like the way it sounds but what do I know? I'm gonna listen tonight crossing into it at 1000.

    Michael, thanks for noticing my avatar. Thats my son (audio lab assistant) Auston. We have a big time of it.

  3. Playing time may have contributed to the decline in those cassettes certainly.

    Talk about revisiting the past: I tried to play a bunch of old 8 tracks a couple of years back. Wow, talk about degradation! Could't make out the music they were so bad. Threw that out too. I thought reviving my tape deck for audio books, but nah.

    Im sure you've thought of this but I would give that deck a good head cleaning too. It sounds like your well on your way to getting that $59 back in listening and having fun.

    LPS fit in the slot no problem. Simply fold them like a trifold wallet. [;)]

  4. I did a similar thing recently. I have a Nakamichi R3? tape deck and until the other day I had approx. 100 tapes I had made on various grades of cassettes made by TDK, some metal, some not. All made from purchased LPs which I still have. Lots of hours tied up in making those in the late 70s and early 80s. Every single one of them has lost a little something. Freq. range not where it was, noise added, etc. I ended up tossing the works. Glad your experience has been better.

  5. Seti on the NAD: Its one of those under appreciated amplifiers and therefore still reasonably priced used. I have gone through/traded several amps over the years. Can't seen to let go of this one. Really like the sound as you pointed out.

    Michael, The Behringer's 24db per octave is not adjustable. Altering the slope would be a cool feature though. I'm guessing the sharpe slope helps with crossover determination however. Not much overlap there. In the avatar, thats my son deciding what sounds good and what doesn't. Everybody needs a second opinion and he freely gives his.[8-)]

    Thanks for the kind comments gentlemen.

  6. Yeah Bruce, that is a little Maggie. Love that little amp. Wish I had another. Then I would try running top and bottom with em. Its interesting how little power those horns need to blow a persons head off!

    The cabs: The previous owner had the horns built in them. When I received them both horns had torn out of the cabs (way too heavy). I replaced the broken motor boards, then flipped the enclosure. For good deep bass those woofers needed all the available space.

  7. Boy, where is everybody tonight? I guess they've all gone out. You forgot to ask what a SET is.

    Since the pros haven't answered I can tell you this much. A push pull has two output tubes per channel. A single ended amp only has one. These two different types of tube amps sound different. Also, some tube amps can switch between these two modes of operation. There are also hydbrid amps which have some tube and some solid state circuits.

    SET = single ended triode.

  8. I have gained so much info from this forum I thought I would share this active crossover, my setup, and my findings.

    I purchased the Behringer crossovers from "SWL" here a few weeks back and just now got it all hooked up. I had no XLR cables so I bought ends and made up several for this project. I wanted to try active crossovers and purchased 2 cabs which were destroyed in shipping (both horns out of mounts). I carefully calculated the volume w/ ports for my woofers from the web sites linked to by members here. I then rebuilt the cabs as woofer enclosures only.

    Running in 2 way stereo I have the top horns running off the little stereo 5 watt single ended triode amp. Bottom woofers on NAD transistor 30w per(late 70s maybe) Im also using the Nads preamp to feed the active crossover. The horns are 16ohm JBL 2441s 2" drivers/Community horns with a sensitivity of 111db and 8ohm Eminence 15" woofers at 101db sensitivity. So I knew the woofer was 10db behind out the gate.

    I started out with everything at 0db with no gain added or subtracted on any channel. I had both crossovers at 500hz. The crossover slopes are 24db per octave so I didnt know if to reverse the horns or not, so I did both. What fun it was to start playing with crossovers, gain, phase, and time (I just physically moved the speakers) until I got what I thought was the most out of it. What did I get: Truely awesome sound. Only with the volume wide open and my ear in the horns did I get any noticeable noise. I played with it all for quite a while and settled on woofers +4db, Horns -4db, horns in phase, crossovers at 475.

    The interesting this about all this to me how hard I had to work to make it sound bad. Taking the crossovers down to 100ish would do it. Or going way too high with it. Flipping the horns in and out of phase didn't make a whole lot of diffference just quieter out of phase (to my ears anyway)

    post-34863-13819455046782_thumb.jpg

  9. Since I started this thread I have been really trying to keep my ears protected. Literally no loud noises for me. If in doubt I wear earplugs. I worked on a pair of speaker cabs and used the table saw. I found the ear protection. Told me son, "no screaming and hollaring in the house"

    Amazingly the tinnitus has reduced a significant amount. Its not totally gone but its much better overall. On a scale of 1 to 10 I have reached about 7. Right now Im back down to around 2. Its really surprising how much LOUD stuff I do day to day.

    Next time I have a flareup I will try the noisy radio. That would probably work for me. When laying in bed if I hear the heaters fan turn on I know its time to fall off to sleep.

  10. 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.

  11. Looking at that graph seems you could cross that driver/horn at 500hz with a Khorn or other suitable bass bin going two way and be in pretty good shape without a tweeter.

    Other than the two camels backs the impedance seems pretty steady to my untrained eye. I would say the average impedance on that combo closer to 8 than 16 ohms though. It spends alot of time below 10 ohms. Maybe Im seeing it wrong. It looks like it should be treated as a 8 ohm speaker on the crossover circuit. What am I missing?

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