Eminence LAB15 Subwoofer, 4ohm, Special Run for CHEAP on ebay

[Patrick Bateman]

Apparently you were not a marketing major?

Engineering. We definitely hate it when the marketing department writes checks that the engineers can't cash.

 

[NEO Dan]

Maybe you should suggest to them they change it from exponentially to sub-stantially...

 

[weltersys]

"Couple that incredible excursion with increased surface diameter and the result is exponentially increased SPL output."

Uhhhhh, NO. That's a lie. Increasing the surface area of the cone doesn't "exponentially" increase output. It increases it fractionally.

True, but doubling excursion results in 6 dB more output, a four fold increase.

1.25" Xmax is about 32mm, pretty huge displacement on the MTX 9515.
Makes the 13mm Xmax Lab 15 seem "short throw" by comparison.

 

[BeauB]

Any opinions on how well the Lab 15 might work in the THAM 15 enclosure?

 

[GM]

Qe seems a bit high for my liking...

I'm kind of liking it for most music or HT where going really low due to budget, space, whatever isn't an option and with >120 dB peaks/2pi from ~27-100 Hz it will meet THX cinema reference in all but the largest and/or most 'open' rooms; plus, at <10 ft^3 net it's short enough for a simple two fold tower or lay down tube.

GM

 

[BeauB]

I'm kind of liking it for most music or HT where going really low due to budget, space, whatever isn't an option and with >120 dB peaks/2pi from ~27-100 Hz it will meet THX cinema reference in all but the largest and/or most 'open' rooms; plus, at <10 ft^3 net it's short enough for a simple two fold tower or lay down tube.

GM

If size is a constraint, does it appear the THAM 15 may be a viable option?

 

[GM]

.......at <10 ft^3 net........

Then again, a ~7.4 ft^3 BR doesn’t give up much to it, so for many it may be the better choice overall.

GM

 

[GM]

If size is a constraint, does it appear the THAM 15 may be a viable option?

Don't know, sorry.

GM

 

[scholl]

Brian,

Are you sure on that Qes? normal specs are .39.

 

[Brian Steele]

Brian,

Are you sure on that Qes? normal specs are .39.

These seem to be some sort of special run of the Lab 15. Impedance is lower as well.

 

[Patrick Bateman]

Brian,

Are you sure on that Qes? normal specs are .39.

Didn't someone mention that this beast has a 4" voice coil?
If so, then there's 33% more copper in the voice coil, assuming the depth is identical, and that would raise the QES.

 

[BeauB]

Didn't someone mention that this beast has a 4" voice coil?
If so, then there's 33% more copper in the voice coil, assuming the depth is identical, and that would raise the QES.

3" voice coil.

 

[m0reilly]

i'm stumped atm as to what type of enclosure to go with these. i'm so used to br, that the thought of losing the capability of going deep when listening to chill hop and the like...has anyone tried the 'boom box' choice in winisdpro and found it to be acceptable for a 'hifi'/music only sub?

 

[m0reilly]

i'll be using an rmx 4050hd pulled from my bass guitar rack for the sub chores. i wonder what two of the lab 4 ohm sealed can do with some power behind them.

 

[m R g S r]

I think it was Dag Johnson that posted a nice lab 15 tapped horn back a while ago.....not sure on the spelling of his screen name. Just off the top of my head

 

[m R g S r]

Here it is. Spelling was a little off lol

http://www.diyaudio.com/forums/subwoofers/190909-40hz-th.html

 

[m R g S r]

Supposedly 4 cabinets will hit 140db at 40hz.....

 

[m0reilly]

a bit too much for my listening area atm. either a single ported cab, or dual sealed @ 3. something ft3. this was just too good of a deal to get just one driver...my typical purchase pattern lol

 

[m R g S r]

i'll be using an rmx 4050hd pulled from my bass guitar rack for the sub chores. i wonder what two of the lab 4 ohm sealed can do with some power behind them.

That's wayyy too much amp for two...that amp will actually deliver a full 1300rms to each of them. More than double the recommended power. Be careful.

 

[GM]

i'm so used to br, that the thought of losing the capability of going deep when listening to chill hop and the like...

So how ‘deep’ is ‘deep’ and at what peak SPL at the listening position [Lp] desired? I already posted a 27 Hz BR alignment that sims ~120 dB/m/600 W from ~25 Hz-up in half [2pi] space.

Tune it any lower and you just give up peak power handling below ~60 Hz, so more room/boundary gain will be required to offset it unless < ~ 120 dB/m peaks minus any loss over distance to the Lp is acceptable.

GM