Stereo Integrity's new HT Subwoofer - Page 42

Man. How narrow? The backs come off most of those chairs.

O rly?

Yup. I have a fairly narrow theater at 10' 8" and my hallway going into it is just under 36", and my door is 34" wide. Chairs were shipped in 2 pieces each (back and bottom). No issues getting them to their home.

My theater is just as narrow but I seriously doubt my door is even that wide. More like 28" or something really crappy like that.

You would need to find out the size with the backs off. Might be close. Can you get to a wall once past the hallway? Opening up the wall and removing a stud is easier than removing the doorway. Unless you wanted to replace it with a bigger door.

I guess you'd have to see it but that's really not an option. No demolition.

Clearly you just lack the dedication

I tested the two D4's of zheka's today on my WT3 and the T/S specs seem quite different then the D2's, though they model very close below about 40hz and are slightly less sensitive above.

(Both tested pretty close so I just posted one)

* This data was exported from the Dayton Audio WT3 Woofer Tester
* f(s)= 18.17 Hz
* R(e)= 7.21 Ohms
* Z(max)= 39.15 Ohms
* Q(ms)= 2.661
* Q(es)= 0.601
* Q(ts)= 0.490
* V(as)= 299.600 liters (10.580 cubic feet)
* L(e)= 6.60 mH
* n(0)= 0.29 %
* SPL= 86.65 1W/1m
* M(ms)= 499.10 grams
* C(ms)= 0.15 mm/N
* BL= 26.14

Anyone have some D4's that can double check those numbers?

Are these measured 'out of the box' or 'broken in'.
Thanks for posting, interesting.

what if current was measured instead?

No problem, that was after about an hour of running sine waves through them.


Actually back on this I had the same multi-meter wired up to my APA-150 while running the sine waves through the driver before testing with my WT3 and it would clip around a reading of 18 volts. That puts it at right about the rated 75 watts into 4 ohms, the drivers excursion was also considerably less. So I would say the cheap multi-meter is at least close on the voltage reading, and that means the old Sony is cranking out some decent power

VB your right that if current could be measured accurately that power in watts could be deduced using Ohm's law. I would need some kind of amp clamp though.

I'll go ahead and post this over here.

I appreciate the reply, Nick.

Let me clarify my question, and it is not specific to the SI drivers but a more general one.

I want to understand what the transfer function magnitude chart in WinISD is supposed to show and why the shape of the curve in TF chart may be different from the SPL one.

The question was prompted by the fact that when comparing D2 and D4 version of the SI 18 HT drivers in the same enclosure, the TF chart would look similar to the one you posted - the D4 having more output down low and very close at higher frequencies. Yet the SPL charts look very different. I have tried various sizes, sealed and vented, EQ or naked. The D2 version would always be at least equal or have advantage over D4 across the passband, more significant at higher frequencies. I have not tried extreme power scenarios, all models were with 1000W or less, trying to keep the drivers within excursion limits.

Thank you
Edited by zheka - 1/27/13 at 7:09am

One thing you might want to consider is taking out the new woofers from the DT cabinets, making separate cabs for them, and putting in a good-quality value-priced "pro" 18 (the Peavey Low Rider 18 strikes me as a great fit) in your DT mains.

I found the issue as to why my driver was bottoming out. I guess one of the kids was horsing around with the karate staff and punched a hole in one of the cones. I repaired the hole with epoxy and it is working fine now. I am mulling over a complete new cabinet design at the moment and hopefully will have something going soon. Thanks!


Keep cranking,

Robert

Noooo.... Scott can't win... Noooo....

the chart (transfer function magnitude) does not take sensitivity into consideration. D2 will produce higher SPL in the same size box and signal power.

Well duh. An 8ohm version of the same driver will be electrically less sensitive than the 4ohm version. But pair up two for 4ohm ....

Also, the same SPL for the same wattage dissipated. It's the overall voltage that would need to be higher but again.... used in pairs.....

mesmerizing...

I don't have one with a clamp but my Fluke allows up to 10A to run through the meter (in series with the load). Not enough for high power testing though.

Uhh oooohhh!!!

Just got an email that my nine 18's were dropped off at my place.

Awwwwww snap!

BOOM... literally. Don't let those things collect dust bro, time to let the LLT's go for a few and pop all 8 in the boxes you already have...four per cab, cutouts above the one you have now where the port is, two on the backside of each, done...

Oh and power them with a combustion engine of your choice

Hhheeelllll yyyeeaahhhh!

Oh gosh, I'm not going to butcher my LLT's.

But I will not wait too long to use em. Hopefully I'll be able to sneak one into my Jeep really soon.


Gonna get a CV5000 and power four per channel 2ohm......at first anyway.

Lol! It's what I feel comfortable with for the time being.

I think it's a good backup for when/if a clone amp were to zap out. I think it would be in everyone's best interest that I make sure everything actually just works then to have to deal with any of that clone failure. Yup.

AND HEY!!!! 108dB @ 10hz, 120hz @ 20hz per quad set (there will be three, one behind the cough even) is .... good enough. Yes sir. Yesssss......sssssiirrr.

agreed. just had to give you a taste of your own medicine with the Url...

I'm actually LOL'ing pretty hard at the gif and the push towards more power. Trust me, I love it and I'm not getting defensive. I do it to you guys ALL THE TIME.

However, just so you can see where I'm coming from....

Here is a pic with a quad SI 18HT @ 625w each, quad SS RLp18's @ 800w each, one of my quad JBL 2226 cluster @ both 225w and 400w each and then a single one of my LLT's with a RLp18 @ 800w.



The pink line is the SI's and there will be two quad driver clusters up front. Yes, eight. The red line is the RLp18's which will go right behind my head. Equal output. Sometimes I amaze myself. The blue line is a single one of my LLT's. Look how they hold up against the onslaught! Crazy capable. The the two green lines are a single quad driver cluster of the JBL midbass at two different drive levels.

Bam!