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Low Down Sound Cab Club started!

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#361
greenboy said:
But what seem like trifling details to some could make big changes. Some just see bigger box, and two drivers of different sizes.
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Here's a somewhat relevant example. Someone might think why not get that cheap midrange driver with the closed back? It's the same diameter, after all - and then I wouldn't have to build a midrange chamber. But that gives you a midrange driver whose frequency response exhibits a multitude of peaks and valleys, with back-waves reflecting off that very close sealed-basket back and into the cone. Does NOT sound very good. And it's not nearly as sensitive/efficient either.

The other thing is that the midrange chamber design actually improves the ridgidity and damping of the baffle, which really improves the general sound especially when driven with big wattage, and incorporates a girdle brace that does the same for side and back panels.

Those incredibly small-chambered closed back drivers can be an upgrade retrofit for some cabs, but they are generally a backward step for anything that is built from scratch.
 
#362
Don's building mine according to GB's drawings I sent him. I asked for the x-over to be at 650hz for the 3015 and 4.5khz for the tweet. I couldn't find a local builder that wanted to do one. I don't know if mine will be among the cabs to be "auditioned" or not. If so, it will be interesting to see pics and reviews of my cab on the internets before I get the thing.
 
#364
billhilly66 said:
Don's building mine according to GB's drawings I sent him. I asked for the x-over to be at 650hz for the 3015 and 4.5khz for the tweet. I couldn't find a local builder that wanted to do one. I don't know if mine will be among the cabs to be "auditioned" or not. If so, it will be interesting to see pics and reviews of my cab on the internets before I get the thing.
Click to expand...

Nope.
 
#365
Couldn't get through via phone so left an email. Definitely not OK with me. I'll have him put in the Eminence 800hz crossover before I have a high pass unit put in there. Really do not care for the sound of full range woofers with upper mid breakup like that.
 
#367
Will do. If previous communications are any guideline I'd expect to hear back tomorrow morning. Not trying to start a stampede or anything - it's totally possible the high pass would sound great, but it will surely sound better and get cleaner, louder, with a low pass on the woofer.
 
#368
greenboy said:
Somewhat, I think. But what seem like trifling details to some could make big changes. Some just see bigger box, and two drivers of different sizes.
Click to expand...

I think what people are requesting from Don is the 15"KLLF and 18S 6ND410, but not necessarily the actual box GB came up with.

My cab ended up being 21.5"w x 18"d x 25"t with slot ports in all 4 corners and an attenuator on the jackplate with lots of bracing.
 
#369
Blues Cat said:
I think what people are requesting from Don is the 15"KLLF and 18S 6ND410, but not necessarily the actual box GB came up with.

My cab ended up being 21.5"w x 18"d x 25"t with slot ports in all 4 corners and an attenuator on the jackplate with lots of bracing.
Click to expand...

Different people are asking for different things, but the main point is that if you want the best benefit out of this type of a two-way design to at least pick a decent region for crossover point and AVOID high-pass-only. That'll make such a jump in sound quality, and perhaps more importantly, minimize the difference one hears in one listening position or another.
 
#370
greenboy said:
Different people are asking for different things, but the main point is that if you want the best benefit out of this type of a two-way design to at least pick a decent region for crossover point and AVOID high-pass-only. That'll make such a jump in sound quality, and perhaps more importantly, minimize the difference one hears in one listening position or another.
Click to expand...

I was concerned that he was not into my design but actually it's been something he's wanted to try for a while. He said the porting was similar to what GenzBenz is doing with their NEO212X.

Don dosen't want to build the exact same cab every time. He welcomes the different variations.

When we spoke of crossovers he didn't mention a high pass. He is still dialing in the crossover point. He said he just had a run of 156 cabs with these speaker combo's and is looking for the best sound.

Don is not just a box stuffer. He really wants the cabs to sound and look great.
 
#371
I spoke with Don on the phone today and he is definitely going the HP only route. He told me my cab wasn’t scheduled to start for a week or so but that with the 3015LF and 6ND104, he recommends a HP only at 1600hz! He said they would be testing some cabs with this configuration over the next week and may change the x-over point.

Don said the full x-over worked for PA stuff but not as well on bass cabs.
 
#372
billhilly66 said:
I spoke with Don on the phone today and he is definitely going the HP only route. He told me my cab wasn’t scheduled to start for a week or so but that with the 3015LF and 6ND104, he recommends a HP only at 1600hz! He said they would be testing some cabs with this configuration over the next week and may change the x-over point.

Don said the full x-over worked for PA stuff but not as well on bass cabs.
Click to expand...

That's weird he told me mine was getting a crossover.
 
#373
billhilly66 said:
I spoke with Don on the phone today and he is definitely going the HP only route. he recommends a HP only at 1600hz!
Don said the full x-over worked for PA stuff but not as well on bass cabs.
Click to expand...

Bummer!...I thought he was on board with the actual fEarful design. I wonder if he's read the threads with all the intensive research done by greenboy (not to mention info from Passinwind, AlexClaber, et al.)

I believe now, I'd just have the box built with all the desired hardware and install my own driver components and crossover.
 
#374
billhilly66 said:
I spoke with Don on the phone today and he is definitely going the HP only route. He told me my cab wasn’t scheduled to start for a week or so but that with the 3015LF and 6ND104, he recommends a HP only at 1600hz! He said they would be testing some cabs with this configuration over the next week and may change the x-over point.

Don said the full x-over worked for PA stuff but not as well on bass cabs.
Click to expand...

That might be decent (read, not great but usable) for a 3015, but NOT a 3015LF. You might want to double check and be sure you're talking about the same thing.

He is definitely wrong on this one. I am definitely getting a crossover and you should too. It's just the right way to go with this driver. The upper mid distortion it has is pointless and should be avoided.
 
#375
Hate to bust in on the fascinating discussions going on, but haven't had a request for a club number in quite a few pages.

Anyone in love with their LDS cab(s) enough to ask for one?

Free to the first 10 to the 20th power customers!!!
 
#376
rpsands said:
It's just the right way to go with this driver. The upper mid distortion it has is pointless and should be avoided.
Click to expand...
Impedance is a far more serious issue. With no low pass the woofer and mid are parallel wired, and above the corner frequency it's not an 8 ohm cab, it's a 4 ohm cab. PA cabs don't low pass just because it sounds better, they do so because amp overheating is the potential result of not doing so. Obviously with a 1x woofer/mid, not a concern, but with a 2x woofer or more it can be a major problem.
 
#377
Well, Don said he’d build whatever I wanted but strongly suggested the HP only. I wish I was more knowledgeable on the subject and could argue convincingly one way or the other. At this point, I find the arguments for the full x-over much more compelling. I’m thinking I’ll ditch the tweet and have him leave the x-over out of the cab. If I ask him to hardwire the drivers to the plate, I can run my rig bi-amp for a while and see where I think it needs to cross.
 
#378
billhilly66 said:
Well, Don said he’d build whatever I wanted but strongly suggested the HP only. I wish I was more knowledgeable on the subject and could argue convincingly one way or the other. At this point, I find the arguments for the full x-over much more compelling.
Click to expand...

I'm with you on that. If he's going to use a high pass circuit at 1.6kHz, then I think I might special order the Eminence 2-way crossover at 800Hz.

Does anybody else have anything to add to this?
 
#380
Chef said:
one could go to greenboys 15/6 thread and read quite a bit.
Click to expand...

Been there, done that. My eyes gloss over reading that thread. :eek: Plus, I don't recall seeing a definite answer regarding the crossover. Just thought I'd ask for more input from those with the same setup (and several with the same setup on order). Plus, I really do look forward to KJung's thoughts on these cabs.
 
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