Driver Reccomendation for 5 cubic Foot Enclosure. Home theater use - Page 2 - diyAudio
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Old 8th February 2013, 02:14 PM   #11
tb46 is offline tb46  United States
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Hi permo,

Just for your information I'll attach a Hornresp Input for a MLTL (mass-loaded transmission line). Seems that bjorno likes them lately :-).

Regards,
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File Type: jpg 1260W_MLTL_Single_Input.jpg (35.9 KB, 95 views)
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Old 8th February 2013, 02:20 PM   #12
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Mass loaded transmission line?
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Old 8th February 2013, 03:16 PM   #13
tb46 is offline tb46  United States
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Hi permo,

Google: MLTL, and MLTL bjorno :-)

Regards,
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Old 8th February 2013, 04:17 PM   #14
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permo,

I built a pair of 1262W in 2.75 ft^3 boxes and used 18" long, 4" flared port kit (Fb=24 Hz)
There was no hint of port chuffing.
I powered it using a CV-900 amp so in theory 420 W/ channel into 2 ohms.
The HP filter (25Hz_4th order) was def. needed.
.
I finally went back to a sealed box with a bunch of stuffing and it requires no HP filter but falls off at 35 Hz or so, but that is what the extra subs are for.
.
Good sounding speaker, requires a very well braced box.

Dave
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Old 8th February 2013, 08:54 PM   #15
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shady dave,
you went back to sealed.............

I'd love to hear why.

I'm waffling between 2 future subs, either porteds with 24hz tune/f3, or sealed qtc .707 with Fsb=f3=31hz.
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Old 8th February 2013, 10:28 PM   #16
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Short answer, they are no longer doing sub duty.

I built subwoofer cabs driven with a Crown Xti-1002 and have the 1262's low passed at 120 Hz to a pair of MMTMM's with no high pass filter at all, I just let them start to roll off at 40 Hz.
The subs fill in everything below 40 Hz or so and when the 1262's were ported they exhibited some single note boom, I very much dislike single note boom.
With them sealed, there is no single note boom, the group delay is much lower and they do not require a high pass filter.
With the CV-900 ( supposedly 420 W/2 ohm) they still only go to about 1/2 of Xmax (read that lower distortion) in the sealed box.
.
Out of context but, I am building a 5 element Bessel array to play around with which may replace the MMTMM's.

Dave

PS put the Infinity 1262W T/S specs in the HRSP file that TB posted and there is a bit of improvement but they cost almost twice as much.
I didn't realize that there was much difference at all between the 1260's and the 1262's except the single vs. dual coil.

Dave
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<---My Transmission Lines from a prior life...Top one Tweeter...Bottom one definitely a Sub
..In space, you can't hear my sub

Last edited by Shadydave; 8th February 2013 at 10:30 PM.
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Old 12th February 2013, 04:17 AM   #17
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Quote:
Originally Posted by Shadydave View Post

PS put the Infinity 1262W T/S specs in the HRSP file that TB posted and there is a bit of improvement but they cost almost twice as much.
I didn't realize that there was much difference at all between the 1260's and the 1262's except the single vs. dual coil.

Dave
The 1262 and the 1260 are, according to infinity the same driver with the only difference being the dual voice coil. According to my research, they are the same price as well. I could have gotten the 1262 for $50 shipped too.....I got the 1260 for ease of installation...straight 4 ohm.

Last edited by permo; 12th February 2013 at 04:20 AM.
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Old 21st February 2013, 12:21 PM   #18
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I built the box, after bracing, port displacement and driver displacement it was roughly 4.1 cubic feet. I used a four inch port 16 inches long to tune it to 23 hz. I stuffed it with 4 pounds of polyfill. I only have 150 watts rms going to it, but it sounds wonderfull and the cone barely has to move to provide substantial output. I think I need a much larger amp. This box is too heavy to move myself is one of the drawbacks tho.
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