stacked LSi9s - part 2

SlowcarIX

didnt go too well stacking 6 high...http://www.polkaudio.com/forums/showthread.php?t=69504

how about 4 on the sides



this guy had good results with stacking 4: http://forum.ascendacoustics.com/showpost.php?p=28182&postcount=45
using these...http://www.ascendacoustics.com/pages/products/speakers/SRM1/srm1.html

worth trying?

hockeyboy

No. Why not let the experts who have sound labs build speaker configs for us?

ben62670

The tweeters will have phase, and lobing issues.
Ben

Shicks18

kinda looks like SDA 1.2TLs minus the woofer at the bottom

heiney9

ben62670 wrote: »

The tweeters will have phase, and lobing issues.
Ben

BIG TIME.

Stacking is rarely a good idea unless you don't care at all about proper phase, time coherence, soundstaging and overall good sound with proper dispersion.

But hey if it floats your boat, rock on.

H9

treitz3

Why don't you just get a pair of SDA 1.2TL's?

Frank840

hey try it i take donations if you dont like it :rolleyes::p

devani

so you won't mind buying 8 of LSi9's stacked but with that money you can buy something better

obieone

devani wrote: »

so you won't mind buying 8 of LSi9's stacked but with that money you can buy something better

Seriously! 8 x $900= $7,200. That'll go a LONG ways on A-Gon!:eek:

Ron Temple

Abner, I'm with Tom. Maybe, the Sierras work fine in that config, but I say get some 1.2TLs and call it a day. Once you jump in, it will be awhile before you get over them.

fossy

$7200 bucks can buy a pair or 2 of really nice speaks

but at the same time, I say go for it , see what happens

you always see lsi9's on agon for 5-6 hundred -- goin used you could do it for half the price

Shicks18

For $7200 get 4 pairs of 1.2tl's !!!! 4 x $1800 = $7200
haha, or get 3 pairs and with the remaining $1800 get 3 kick **** 2 channel amps!

Hawkeye

I thought I saw a line array @ AV123 or something like that for less change. If you want a line array, buy one that has been designed that way. But, it's your money so go for it!

Gordon

SlowcarIX

ben62670 wrote: »

The tweeters will have phase, and lobing issues.
Ben

heres an explaination by David Fabrikant - www.ascendacoustics.com

http://forum.ascendacoustics.com/showpost.php?p=28482&postcount=110

"Like all things audio, every design is a compromise at some point. I read that *post* over at Hsu's and it is what I like to call a half-truth. Due to a general lack of knowledge, lobing has gotten a bad rap - seems it is always associated with being a bad thing which is only 50% correct. Vertical lobing is a good thing, it is what makes MTM speakers so popular and so successful in the marketplace. A large vertical lobe decreases vertical dispersion which diminishes the effect of ceiling and floor bounce, reducing reverberation which increases intelligibility. (see Ron's un-EQ'd measurements and notice the reduction in the dip at 180Hz as compared to the single speaker measurements, this is floor bounce) Intelligibility of a loudspeaker can be thought of as a ratio between the direct sound of a loudspeaker and the background noise in a room. The less background noise, the more clarity. Same general principle as acoustically treating a room.

Ron's setup should be considered a vertical line array, quite common in the loudspeaker industry and even more common in sound reinforcement applications. The taller the array, the more limited the vertical dispersion becomes. Provided the listener is within the lobe (listening height is not above or below the column), vertical lobing is beneficial. Vertical line arrays also project sound a bit differently than a conventional loudspeaker, with the rate of SPL decrease with reference to distance being about half that of a conventional loudspeaker. For example, at 2 meters away with the same voltage level, the line array will sound louder and cleaner.

In addition to the advantages as described above, there will be major improvements with regards to distortion, headroom capability and dynamics.

Are there disadvantages? Certainly -- if not seated within the vertical lobe clarity will be diminished rather than enhanced. Horizontal dispersion is slightly reduced but this would only become a problem if seated at an off-axis angle of 20 degrees or greater from either stack. In addition, this type of setup is not recommended for extreme near field listening or extreme far field listening where there can be frequency response changes.

Due to the unique phase integration of the woofer and tweeter, which closely emulates single point source radiation up to about 20-25 degrees, the Sierra-1 works exceptionally well in this particular application, far better than our other products.

Ron's requirements were unique... He loves the sound of the Sierra-1 but desired more. His primary requirement was that he wanted the ability for extremely high sound pressure levels while maintaining clarity (a serious problem for many rooms as room effects before more pronounced at higher levels). In addition, Ron seldom listens off-axis and never in the near field. He has acoustic room treatments on the front, rear and side walls but he has a wooden floor and I don't believe the ceiling is treated, thus limiting vertical dispersion became high priority. Considering all of these factors and after many discussions about the pro's and con's, only then did I begin running various tests of the stack. To my surprise, and as I mentioned before, the stack actually far exceeded my expectations.

In addition, the type of line array offers benefits over a typical multi-driver line array.

1. Each woofer is in its own dedicated and damped enclosure. There are no modulation effects between woofers because they do not share the same cabinet volume.

2. Considering all of the individual enclosures and the fact that each of these enclosures are laminated bamboo, cabinet resonance and energy loss will be dramatically less than a typical floor standing line array -- I would wager less cabinet resonance than nearly any floor standing loudspeaker on the market.

3. There are multiple crossovers being used. A typical line array uses a single crossover for all of the driver elements (each driver being directly connected to the same crossover output). With multiple crossovers; saturation effects, distortion and heat are dramatically reduced due to current being equally distributed between all of the crossovers as opposed to a single crossover network. At extreme listening levels (high current) this becomes a tremendous advantage.

Some people who read this thread will see this as a gimmick or even a juvenile attempt to sell a lot of loudspeakers. Nothing could be further from the truth. Ron's solution is what defines acoustic engineering, designing a sound system that meets or exceeds the challenges set forth... With that in mind and from the various comments I have received from those lucky enough to experience it in person, expectations and requirements have been met"

anyways, no more of this speaker stacking business for me...:o

Face

Want a wall of sound?
http://www.mcintoshlabs.com/products/mcintosh-xrt2k-reference-loudspeaker.asp

unc2701

Heh. Hey, SlowcarIX, you can build those McIntosh XRT's

You need 12 of these:
Subwoofers

80 of these:
Tweeters

and 128 of these:
Mids

Crossover & cabinet and you're done! Only $9528

SlowcarIX

lol, thats awesome!!

$8575.60 for all the drivers alone for L/R...:D

how did u estimate the price for the cabinet and x'over?

earlier on, i was thinking of getting a bunch of these and gutting them for drivers...:o

SlowcarIX

Face wrote: »

Want a wall of sound?
http://www.mcintoshlabs.com/products/mcintosh-xrt2k-reference-loudspeaker.asp

:eek:

or one pair of these from a-gon...:D

zingo

I would go for the Infinity RS, or just build a pair of these; directions are parts list included: