Hi Brian,
Post #840: "...but why?"
I don't want to recommend a driver for a completely different application than what it was designed for.
I see the 1262W as a fine car and home product, but not as a professional PA driver.
The LAB12 was designed by Tom Danley together w/ help from Eminence for the LAB Horn project, and should be a more rugged, PA oriented solution within its design parameters.
I have no direct experience w/ either driver, so it's probably just a personal prejudice (the old: don't use a screw driver as a chisel thing 🙂 ). You, on the other hand, probably have experience w/ both, so I would refer to your judgement.
Regards,
Post #840: "...but why?"
I don't want to recommend a driver for a completely different application than what it was designed for.
I see the 1262W as a fine car and home product, but not as a professional PA driver.
The LAB12 was designed by Tom Danley together w/ help from Eminence for the LAB Horn project, and should be a more rugged, PA oriented solution within its design parameters.
I have no direct experience w/ either driver, so it's probably just a personal prejudice (the old: don't use a screw driver as a chisel thing 🙂 ). You, on the other hand, probably have experience w/ both, so I would refer to your judgement.
Regards,
Hi Y'all,
Just a quick look @ the MCM 55-1465 in the THAM15 and in straight tapped QWT of 100L. I'm attaching both Hornresp export files. That doesn't look bad at all.
Regards,
Just a quick look @ the MCM 55-1465 in the THAM15 and in straight tapped QWT of 100L. I'm attaching both Hornresp export files. That doesn't look bad at all.
Regards,
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Hi bjorno,
You are correct. I like your example calculations. Thanks.
Regards,
P.S.: Do you have any experience w/ the 55-2962, Post #838?
You are correct. I like your example calculations. Thanks.
Regards,
P.S.: Do you have any experience w/ the 55-2962, Post #838?
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Laserpaddy ,
No no not at all , you are fine .....
In fact I have something for you =)
So your amp will do around or just under 500-ish watts at approximately 5 ohms per channel which is PERFECT to drive two Alpine SWS-12D2s at the measly cost of $99 per driver 🙂
These particular drivers work extremely well in tower-ish 32hz tuned 100 liter ML-transflex boxes or Tapered-tapped pipes (sort of like a reversed Tapped Horn) they are pretty much equivalent in this case .... The boxes are rather small considering the extension and output .....
These two cabinets will get you almost 125db from 30hz-120hz
48" tall with a 13.5" wide x 12.5" deep footprint
Easy build ,
A little bit of stuffing at the closed end is advised ...
Using the "magnet in" arrangement is also best to make everything fit properly and to also avoid the mechanical motor noise that Mr Sabaspeed reported with these drivers (only an issue with an exposed motor)...
If you still wanted to use your Beta15s for something (do you have second one?) you could put them in small sealed boxes and have them provide the midbass in your mains unless you already have that covered ...
I will post some data for those subs....... Let me know if you like this idea and i will make a few sketches for you 🙂
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hi TB46 - I bought that MCM 55-1465 in March 2012- - not tried that other MCM - ah - here's one review on the 55-2962:
"Actual specs" by killersoundz on 5/6/2012
Value:
Quality:
Build quality seems ok but the manufacture specs are far off from what I actually measured. Here are my measurements: FS - 47hz Qts - 1.18 Qes - 1.518 Qms - 5.31 Le - 1.88 Re - 7.51
its strange that MCM has that one (55-1465) DVC woofer which basically meets specs - wonder who builds it?
"Actual specs" by killersoundz on 5/6/2012
Value:
Quality:
Build quality seems ok but the manufacture specs are far off from what I actually measured. Here are my measurements: FS - 47hz Qts - 1.18 Qes - 1.518 Qms - 5.31 Le - 1.88 Re - 7.51
its strange that MCM has that one (55-1465) DVC woofer which basically meets specs - wonder who builds it?
An externally hosted image should be here but it was not working when we last tested it.
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Matt,
Very interesting, let me think it over and yes I did have the original and intention of using the beta 15 for a midwoofer...but I like your idea but does the 48" have to be oriented in the vertical axis only? Rather than horizontal?
Very interesting, let me think it over and yes I did have the original and intention of using the beta 15 for a midwoofer...but I like your idea but does the 48" have to be oriented in the vertical axis only? Rather than horizontal?
TB46 ,
It looks like the design in post #742 should work well for your MCM 55-1465 driver ... http://www.diyaudio.com/forums/subw...ld-series-tuned-6th-order-75.html#post4158362
The cab is tuned to 40hz ... I can try making a 50hz version too ...
Here is a simulated graph using HR's "filling" feature at the closed end as depicted in the sketch .....
One graph has a little bump on the top as i attempted to simulate the small amount of additional loading on the high end due to the shared mouth chamber (series and parallel tuned simultaneously, almost Karlson-ish) ......
At 100 watts it does go a little past it's rated excursion, a 50hz version might fare better in that regard but this looks nice and flat 🙂
It looks like the design in post #742 should work well for your MCM 55-1465 driver ... http://www.diyaudio.com/forums/subw...ld-series-tuned-6th-order-75.html#post4158362
The cab is tuned to 40hz ... I can try making a 50hz version too ...
Here is a simulated graph using HR's "filling" feature at the closed end as depicted in the sketch .....
One graph has a little bump on the top as i attempted to simulate the small amount of additional loading on the high end due to the shared mouth chamber (series and parallel tuned simultaneously, almost Karlson-ish) ......
At 100 watts it does go a little past it's rated excursion, a 50hz version might fare better in that regard but this looks nice and flat 🙂
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Oh crud, I have to stop reading this, now I want to build that one, too.
And I just saw that Stereo Integrity has their SI HIT 18 on sale for $159 (free shipping). I have in SI HT 18, and now I've convinced myself I need another?? Good gosh - my wife is going to clobber me.
I have to assume there is no way that will work in a THAM 18.
Ok, I was just wondering if there was a technical reason behind your opinion. Car audio drivers, well, good "mid-range" ones (perhaps not the high-end "SQ" ones) are usually built to take quite a bit of abuse too, sometimes at the expense of SQ. From a durability perspective, I wouldn't be too worried. In fact, the old "JBL 1200Gti" car audio subwoofer was basically JBL's pro audio 12" bass driver with a heavier cone.
However I think what distinguishes the LAB12 from the 1262W is its low Le/Re ratio (1.48/6), which could be of benefit to its intended use in a front-loaded horn. The 1262Ws Le/Re ratio is a lot higher (2.89/3.59). This, and its low efficiency, quite likely put it out of the running for pro audio use.
Hi Y-all,
Hi freddi,
Post #848: "... here's one review on the 55-2962..."
Those T/S are really far off, that's a shame. Thanks for the data.
***********
Hi MMJ,
Post #852: "... the design in post #742 should work well for your MCM 55-1465 driver..."
Agree, the 55-1465 will work in all kinds of QW enclosures.
***********
Hi Brian Steele,
Post #854: "... what distinguishes the LAB12 from the 1262W is its low Le/Re ratio (1.48/6)...This, and its low efficiency, quite likely put it out of the running for pro audio use."
That's an interesting observation (Le/Re ratio). Would be nice to get more complete Le data for all drivers in general. I fully agree that the low sensitivity is a big knock against most of these otherwise fine drivers when it comes to PA, but they look just fine for anything I would consider home use.
**********
Hi BeauB,
The 55-1465 looks pretty good in the THAM15 (not the 12). You might put that on your list. You can always fiddle a little with the cross-sectional area values in Hornresp (make the enclosure a little narrower or wider). 🙂
Regards,
Hi freddi,
Post #848: "... here's one review on the 55-2962..."
Those T/S are really far off, that's a shame. Thanks for the data.
***********
Hi MMJ,
Post #852: "... the design in post #742 should work well for your MCM 55-1465 driver..."
Agree, the 55-1465 will work in all kinds of QW enclosures.
***********
Hi Brian Steele,
Post #854: "... what distinguishes the LAB12 from the 1262W is its low Le/Re ratio (1.48/6)...This, and its low efficiency, quite likely put it out of the running for pro audio use."
That's an interesting observation (Le/Re ratio). Would be nice to get more complete Le data for all drivers in general. I fully agree that the low sensitivity is a big knock against most of these otherwise fine drivers when it comes to PA, but they look just fine for anything I would consider home use.
**********
Hi BeauB,
The 55-1465 looks pretty good in the THAM15 (not the 12). You might put that on your list. You can always fiddle a little with the cross-sectional area values in Hornresp (make the enclosure a little narrower or wider). 🙂
Regards,
Oliver,
For the price, I may just give that a go - after building the two Lab 15s, and then two "Marty Cubes" for the SI HT 18s I have.
BTW - Stereo Integrity is selling the SI HT 18 for $159, with free shipping this month.
That is a steal.
Good information to take in! This may not be for a while, School is starting back up and this looks like a whopper of a semester. Lots of heat transfer, thermo, and machine design 😱
The more I think about it, the bandpass box may have to be ruled out early because while being a good deal smaller, it seems to yield a nearly identical response to my reflex box if WinISD is to be believed. That type of small front chambered alignment will really come into its own when I can afford a STOUT driver and amp that'll run at 75-80 volts RMS. Then its like a 70 Liter noise violation machine 😀
MMJ, Do you have a set of HR inputs for that awesome looking box? And if it isn't too complicated to explain, what does the offset do for the response?
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