Another subwoofer GTG, Southern style - Page 8

So Kyle, do forgive me if I'm wrong, but do you work for audiopulse or what exactly? I'm a newbie and still learning everyone.

And since we are all going to be meeting everyone soon I figure we could do a quick intro to get some awkwardness out of the way.

My name is Kyle, I am from Martin, TN and am 24 years old. Been in the Army Reserves 7 years, 1 of which I was overseas. Currently attending college for my Bachelor of Science in Nursing, will graduate in May 2010. I work at the university at the computer helpdesk answering phones troubleshooting computer/network problems. I also install tvs/sound systems in the home on the side.

Ooh a little lower than expected. Nice. We can make it work. I'll probably do 20-25hz somewhere. I can use the DCX on it. You think 4000w will be enough to get that nice, just punched in the face, effect out of it?

Definately. I don't charge much, but $50 for an hours worth of work setting up someones stuff isn't bad at all. Every now and then I'll get something more complicated and I'll charge more.

This one lady bought a new computer and wanted me to install it for her and I ended up getting $175. I only asked for $125 and that included me putting Office 07 on it (I have an OEM version), but she said the $50 extra was for future tech support lol. She called me like a week later because she deleted her clock widget.

Brandon, I finally got around to printing off directions to your house. Real easy for me. I live about two miles from 31E. I get on 31E go 30 miles then turn left onto 231. 231 takes me to with in a couple miles of your house. 82 mile trip for me.

I am familiar with 231 because that is the road we take when going to Naples Florida. Maps says 2 hours and 2 minutes, but I know it only tales about 1.5 hours.

any chance you guys could test different crossover points?

the idea here would be that most subs will sound similar down around 30hz, and so the only real performance measure here is max spl (which is something that anybody can calculate with t/s specs so doesn't prove anything). however, as the crossover to the sub is increased, we should see some real differences among the performers be revealed.

50-80-100-maybe even 120/150hz could be very telling.

where can we cross these subs and what are the tradeoffs are questions we should all be thinking about.

i was re-reading this thread and just need to clarify something. the lms 18" appears to be a**-f**-awesome, but i can't condone a 500g driver for mid-bass (let's call mid-bass from about 60-180hz or so). an elephant will never move as quickly as a flea no matter how powerful. i've got to stick with the lighter drivers in this regard. no lectures on le are required, that doesn't tell the whole story.

to build on a point made earlier, i would love to hear folks responses to the maelstrom and the lms-ultra when crossed around 50hz. is there a sound quality advantage there or not? has anybody asked haskins if he could shoot a maelstrom down for listening?

given that the maelstrom goes for about half the cost of an lms, my money would be on a pair of maelstroms...at least up to around 50hz or so, which is the primary domain of subs. above that i'd think the lms may pull forward on sound quality.

probably its low qes, which is very atypical of subwoofers.

the only other driver that i've seen of remotely similar design is by jbl, the w1500h. it doesn't have the linear motor structure however, just a monster bl and in turn very low qes 0.25.

LTD02,

I don't think that we'll have time to do alternate xover point testing. Just saying. We'll be lucky to plow through what we've got going already. That's why we'll be using a moderately high xover in the first place: 100hz, maybe even 120hz if it's available.

LMS: Is very good at the xover region, it is low LE, high BL, low distortion and sounds great. It is not the best in the world at 50-200hz. I don't think anybody is saying that. It does however do a good job of mimicing the sound of a light pro style woofer (I'm around this stuff daily) in that range but with out anywhere near the same efficiency. That's the best way I can describe it. Some of the best Pro drivers will be better in that range. The LMS does some things below 40hz that they can't touch though too. It's all about tradeoff's.

Crazy. We had some rain and thunder but nothing too bad. What do you do for a living brandon?

lightening up the mms is an obvious way to gain sensitivity which will improve all non xmax limited related frequencies, but in the case of the lms ultra, its also designed to move a lot which means a heavier suspension system, longer coil and stronger parts, so its not exactly easy or cheap. The 09's will shave some mass due to a lighter cone, but there is really no practical replacement for a rubber surround. Foam is lighter, but less durable and attractive. The main focus for the 09's was reducing eddys in the moving conductive parts, lower AC magnetic modulation, inductance and moving mass, and a much better suspension system with a much stronger cone and $500 lower MSRP... tall order. i wish i had the 09 lms's ready right now for this GTG, the improvements are vast. We even have a design for a neo version next year that weights less than 40 pounds if all goes well and there is demand.

Awesome Kyle. If the LMS Ultra's are everything that people have been saying they are I can't wait for a listen. And if a new series is coming out relatively soon that is even better. By the time I build my box I should ready for it Let us know when they are due to come out.

Kyle, did you have a projected date of when the new LMS's could possibly see the market? Any teaser pics you'd be willing to share...

no photos.. i only have solidworks drawings atm

this is the best i can do

Nice.... does that have a smooth solid cone glued from the bottom? like the rest of the TC drivers, or is there a dust cap...

Are those perforations on the surround part of the design... cool...

That looks SEXY BTW...

Kyle,

Will tc be able to do top assemblies for the old products like the 5400 or ultra?

Just in case.


Thanks,

Robert

Nice Kyle. The neo version sounds like a winner. from looking at your screenshot it appears as if the basket bolts onto the motor instead of the threaded, screw on type? Did you guys lose that patent?

yes, the basket attachment is like our pro audio drivers, this gives us a much better precision tolerance (a few thousands of an inch to be exact) so top assemblies will be much easier to install and swap.

Robert,
Yes, we can service older drivers, its been one of our main goals for for year. We're settings up a special assembly line in-house just for repairs and service. We'll either replace parts with new ones or retrofit to make it work.




Its a two piece cone Rohacell core with fiberglass on both sides, very strong and light. It has a traditional dust cap. The grooves in the surround are designed to prevent dimpling which can make some audible distortions at high excursion.


also, those are 11" spiders
new p2p excursion bottoms at 4.00"
t-yoke is undercut
3 shorting rings
100% larger poll vent area
new former material (leaving this a surprise until last)
new FEA'ed LMS coil pattern
41mm one way @ 70% BL

we really just wanted to improve it as much as possible.