(Wash DC-Metro Area Only)
Hi All,
I'm looking to sell a partially complete 4 Pi Build.
I've abandoned the project mid-way. I was building a set for my parents, as I got closer to completion, my brother ended up gifting the pair that I gifted him several years back to my parents instead.
I was contemplating completing the project, but I hit a snag. One of my JBL 2226H driver "buzzes" at low frequency (120hz and less). It may be the dust cap, it may be the coil. Don't know, but I don't plan on sinking any more money into the project.
I currently have the following:
Pair - 4Pi Cabinets - built with 18mm Baltic Birch Plywood - the enclosures were built taller and the horns were centered for aesthetic purposes. No standing wave issues with the tall cabinet - this was verified via impedance sweep and close mic measurements. The enclosures were heavily braced and were finished with water-based poly.
Pair - Wayne 4pi Horns
Pair - Denovo DNA-360 compression drivers (apparently a direct clone of the DE250)
Pair - JBL 2226H drivers, one works flawlessly, the other has a buzz at low frequency.
Not sure what is a fair price, but I was thinking $400 for all of the above?
I figured a used pair of Wayne horns will sell about $60ish, the Denovo drivers around $120-ish, a single JBL around 150-ish, and that asking $80 for a pair of completed cabinets with terminal cups + sound insulation, etc. is not unreasonable.
No crossover components are included - but schematics are available directly from Wayne at no charge. I also had my own take on crossover because I thought about voicing them slighly differently than Wayne (not better - just different) - I can share that with interested parties.
Hi All,
I'm looking to sell a partially complete 4 Pi Build.
I've abandoned the project mid-way. I was building a set for my parents, as I got closer to completion, my brother ended up gifting the pair that I gifted him several years back to my parents instead.
I was contemplating completing the project, but I hit a snag. One of my JBL 2226H driver "buzzes" at low frequency (120hz and less). It may be the dust cap, it may be the coil. Don't know, but I don't plan on sinking any more money into the project.
I currently have the following:
Pair - 4Pi Cabinets - built with 18mm Baltic Birch Plywood - the enclosures were built taller and the horns were centered for aesthetic purposes. No standing wave issues with the tall cabinet - this was verified via impedance sweep and close mic measurements. The enclosures were heavily braced and were finished with water-based poly.
Pair - Wayne 4pi Horns
Pair - Denovo DNA-360 compression drivers (apparently a direct clone of the DE250)
Pair - JBL 2226H drivers, one works flawlessly, the other has a buzz at low frequency.
Not sure what is a fair price, but I was thinking $400 for all of the above?
I figured a used pair of Wayne horns will sell about $60ish, the Denovo drivers around $120-ish, a single JBL around 150-ish, and that asking $80 for a pair of completed cabinets with terminal cups + sound insulation, etc. is not unreasonable.
No crossover components are included - but schematics are available directly from Wayne at no charge. I also had my own take on crossover because I thought about voicing them slighly differently than Wayne (not better - just different) - I can share that with interested parties.
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Dust cap buzz is fixed with a bit of Moyen glue.
Voice coil rub is fixed by massaging the spider once you know where it is rubbing.
Those cost essentially nothing.
However a burned voice coil does require a recone.
Carefully push the cone in and out with your fingers on the edge of the dust cap. That should allow you to figure out where it rubs.
Voice coil rub is fixed by massaging the spider once you know where it is rubbing.
Those cost essentially nothing.
However a burned voice coil does require a recone.
Carefully push the cone in and out with your fingers on the edge of the dust cap. That should allow you to figure out where it rubs.
Simon,
Thanks for the recommendation. I did exactly as you suggested, massaging the spider. Surprisingly, doing so resolves the noise issue ----- unfortunately, the noise resumes within a few minutes of operation. I think it is likely the result of a not perfectly aligned recent recone job. The cone essentially looks brank new and is authentic JBL recone.
I'm a little bumped about running into this issue. Besides the low-frequency noise issue, the two JBLs were +/-.5db all the way up to 2.7Khz, and the Denovo were +/-.25db all the way up to 10Khz, and +/-.6db from 10Khz - 20Khz.
Because the second woofer may need a recone, this is exactly why I've listed everything at such a heavy discount.
Also - considering the limited market for such large speakers, I may consider partial trade for speaker components - but will always prefer a cash sale first.
Thanks for the recommendation. I did exactly as you suggested, massaging the spider. Surprisingly, doing so resolves the noise issue ----- unfortunately, the noise resumes within a few minutes of operation. I think it is likely the result of a not perfectly aligned recent recone job. The cone essentially looks brank new and is authentic JBL recone.
I'm a little bumped about running into this issue. Besides the low-frequency noise issue, the two JBLs were +/-.5db all the way up to 2.7Khz, and the Denovo were +/-.25db all the way up to 10Khz, and +/-.6db from 10Khz - 20Khz.
Because the second woofer may need a recone, this is exactly why I've listed everything at such a heavy discount.
Also - considering the limited market for such large speakers, I may consider partial trade for speaker components - but will always prefer a cash sale first.
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Massage it a bit more just where needed to clear the rub. It is a technique taught in the JBL recone course.
Simon,
Thanks again for the suggestion. I did as you suggested, unfortunately, it does not budge. I think there may be a part of the coil that protruding something inside the magnet assembly that is rubbing. I ended up removing the dust cap to see to investigate further. The inside is clean and free of obstruction, but it is definitely an issue behind the spider, in between the coil and the front plate.
Given the issue, I'm including the second JBL driver essentially free.
Thanks again for the suggestion. I did as you suggested, unfortunately, it does not budge. I think there may be a part of the coil that protruding something inside the magnet assembly that is rubbing. I ended up removing the dust cap to see to investigate further. The inside is clean and free of obstruction, but it is definitely an issue behind the spider, in between the coil and the front plate.
Given the issue, I'm including the second JBL driver essentially free.
It is possible to completely remove the cone assembly and 'start over' depending on your time and solvent fume tolerance. Pretty sure I have a voice coil shim for the 2226 somewhere in storage. I can do it here if you want. Not like I have a lot else to do these days and certainly not like I don't owe you that at the least for the superb sub cabinet.