Flex Your PCD Mettle:

[Skywave-Rider]

Re: Flex Your PCD Mettle:

What was your question?
:D

[Cerdic]

Re: Flex Your PCD Mettle:

Sounds great, smooth mids and highs, low max power, high sensitivity, 60hz crossover point, which build? deluxe, HO, Delite 12 or SR?

There, is that better? :p

C.

[Flacjunky]

Re: Flex Your PCD Mettle:

Got them hung up tonight

Wall mounted boxes angled down ....... brilliant. Where have I seen that before?

;) ;)

Man, Stgdz, what to heck are those little stubby studs attached below the single? top plate of your walls?

[donprice]

Re: Flex Your PCD Mettle:

Sounds great, smooth mids and highs, low max power, high sensitivity, 60hz crossover point, which build? deluxe, HO, Delite 12 or SR?

There, is that better? :p

C.

Draw up your 1.5 ft3 box and run the box models. Does one stand out for lower-end performance? All were built in the PE trap cab (~1.6 ft^3?) which probably isn't optimal for for any of them.

The SR is clearly the budget-friendly choice due to the bolt-on selenium driver.

[Zilch]

Re: Flex Your PCD Mettle:

Sounds great, smooth mids and highs, low max power, high sensitivity, 60hz crossover point, which build? deluxe, HO, Delite 12 or SR?

NQ is HO, basically; Brandon has not yet posted his passive crossover for it. Of my builds of your options, I like Deluxe best. SR's a worthy "budget" alternative.

Man, Stgdz, what to heck are those little stubby studs attached below the single? top plate of your walls?

SawZall practice.... :p

[Zilch]

Re: Flex Your PCD Mettle:

From another forum:



Vintage cab, vintage woof, eWave SR HF:

http://www.diyaudio.com/forums/multi-way/169755-what-would-you-do-cabinet-15.html#post2285439

[stgdz]

Re: Flex Your PCD Mettle:

SawZall practice.... :p

That and a valuable lesson of check twice before doing something. I was trying to do a staggered stud build but I didn't buy a 6" top and bottom plate. So I had studds placed 8" apart, bad for sound proofing. Well stgdz why don't you just replace the wall you say? Well my father in law who always over builds everything used bolts for holding the bottom plate to the wall and there is no way we are getting them out of the cement.

So a valuable lesson but I don't think there is much I can do with sound proofing when it comes to these massive speakers and subwoofers I built.


Also Zilch, I know you are in Cali. If you are near costa mesa you should really swing by QSC sometime and listen to their 2150's. Its a 3 way speaker but the mid range on it works so well with the woofers and the compression driver. The only thing I don't like about them is they are a bit bright on the top end

http://stgdz.shackspace.com/Shack/house/Hometheater/downstairs/qscinema/measurements/fronts/front%20full%20range.jpg

[rudyjakubin]

Re: Flex Your PCD Mettle:

Also Zilch, I know you are in Cali. If you are near costa mesa you should really swing by QSC sometime and listen to their 2150's. Its a 3 way speaker but the mid range on it works so well with the woofers and the compression driver. The only thing I don't like about them is they are a bit bright on the top end
http://stgdz.shackspace.com/Shack/ho...ll%20range.jpg

Are these it???

http://www.qscaudio.com/products/speakers/dcs/dcs_sc2150.htm

The CLONE;

http://www.avsforum.com/avs-vb/showthread.php?t=1173647

I hope these are the exact part number. I ordered a pair at QSC for $72... They don't show a picture of the item...

http://www.qscparts.com/ and enter part# in search field... PL-000447-GP

[Cerdic]

Re: Flex Your PCD Mettle:

Right now, with the good words said about the "budget" SR build, it's looking like a my likely choice. I'm liking the way the PA310-8 is modeling for my application in WinISD. I don't know how to post graphs well, but here's what I came up with, ASSuming the goal is a flat power transfer fxn/SPL graph through my desired x-over frequency.

It modeled best for me in a 1.7-1.8 cuft net enclosure, which should be a 25x16.5x12.25, NQ size enclosure with a double front baffle, with space for bracing, drivers, and port.

With a 53hz tune, it produces an F1 at 61hz, F3 at 53hz, and F10 at about 42hz - adequate for a 60 or 80 hz electronic xover. At my receiver's power of 100w, xmax is controlled at 3.5mm with a predicted 115db (not accounting for baffle step), 200w brings it up to 4.5mm. With a 60hz x-over, and single 4" port, port speed is a lazy 13m/s, not necessitating extensive port flaring.

The 2512 could dig lower, but wanted a 3-4cuft box, The 3012 HO hasn't yet modeled well for me as yet. Haven't modeled the 3012 LF yet, but the PA310-8 seems to do well with a smaller box and judicious power input - though probably enough to make your ears bleed, and outstrip my current subwoofer.

Newbie Questions: Is it best to have a completely flat SPL graph in these freq ranges, gently falling, or..? It seems like it's always easier to "cut" a bit of output from a flat graph if room gain adds a bump, than overestimating room gain and having to add boost to smooth it out. I don't think my 3500cuft room is going to add much, but near boundary placement may. What do I look for in the graphs for your projects Zilch to figure out if you added in baffle step correction and how much? Do you think the SR x-over design as it stands will work well for near/on boundary placement?

Best,
Christopher

[Mayhem13]

Re: Flex Your PCD Mettle:

Reduce the enclosure size to 1.5cuft and set Fb to 60hz. With an 80hz XO, you'll never hear the difference. Power handling increases and impulse response smooths a bit as well.

[stgdz]

Re: Flex Your PCD Mettle:

From another forum:



Vintage cab, vintage woof, eWave SR HF:

http://www.diyaudio.com/forums/multi...ml#post2285439

any idea why there haven't been more horn loaded woofer builds like klipsch heritage line?

[Pete Schumacher]

Re: Flex Your PCD Mettle:

any idea why there haven't been more horn loaded woofer builds like klipsch heritage line?

Because you need a 2000 sq foot living room to accommodate the size of the horns?

[Mayhem13]

Re: Flex Your PCD Mettle:

Ok Zilch, i'm gonna take the Ewave plunge with Deltalight 2510's since i have a pair already!:D

Some background....these will be sitting on top of two stereo bass bins using Dayton RSS315HF's tuned to 20hz and powered with 400w each. I can selectively cross these from 240hz on down. Deltalight 10 shows an F3 of 95hz sealed in 30L so i think i'll take that route.

Didn't care for the results of the 122i and not sure if 152i is just too damn wide to mate with these. XT1046 is really nice........and REALLY expensive! 612 has worked really well in the development stage.......and is pretty hard on the eye.

Which do you suggest from the listening ear.....or do you have something else up the sleeve?

[Zilch]

Re: Flex Your PCD Mettle:

Which do you suggest from the listening ear.....or do you have something else up the sleeve?

What HF driver did you run on 612?

Never tried DE250 on 122i; Delite 10e was based upon Celestion 1425 and crossed high. It may work out better with DE250.

All variants you are contemplating will require crossover development work except Delite 10 using XT1086. None on eBay active or completed right now, but we know they're out there. Penn have a pair he'll sell you, maybe?

[edlafontaine]

Re: Flex Your PCD Mettle:

Zilch, Pete, see the original post:

http://techtalk.parts-express.com/showpost.php?p=1634520&postcount=153

I'm trying to get caught up on my home work and ready for Iowa. Can you clarify the work done in smoothing the DeLite 12 response around 2.2K? A schematic (or description of tap points) would be most helpful. I'd like to bring and show this along with "stock".



Zilch = Blue

Schumacher 1.1 = Red, Green

Bypass cap is 1.5 uF
Notch inductor is 2.0 mH
XO = 1408 Hz
Axis = +1.83°

The impedance correction notch flattens the peak at 2.2 kHz.