Eminence Legend BP102-4

THIS 10" EMINENCE LEGEND BP102 IS A SPECIALLY DESIGNED 200 WATT RMS WOOFER FOR BASS GUITAR WITH LOTS OF TONE
NICE WARM TONE WITH EXTENDED XMAX OF 6.2MM FOR A CLEAN BASS SOUND
WIDE FREQUENCY RESPONSE OF 40HZ - 2KHZ
WORKS WELL AS A REPLACEMENT TO THE AMPEG SVT BASS CABINETS & MANY OTHERS
LEGEND BP102-4 10" SPEAKER WORKS IN 4 x 10 AMPEG 4 0HM BASS CABINETS
NOW AVAILABLE IN 4 OR 8 OHMS

Well, that is what it is ina nutshell, a small description found online. I picked up 4 of these speakers to put into an old SWR Goliath II 4x10 cabinet that had it's original PAS 10's blown up...all 4 of them.
Here are some of the specifications directly from the Eminince website:

SPECIFICATION
Nominal Basket Diameter 10'', 254mm
Nominal Impedance* 4 ohms
Power Rating
Watts 200W
Music Program 400W
Resonance 35Hz
Usable Frequency Range 40-2kHz
Sensitivity*** 90.5
Magnet Weight 38oz
Gap Height .31'',7.95mm
Voice Coil Diameter 2'', 50.8mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 34.52Hz
DC Resistance (Re) 2.7
Coil Inductance (Le) .68mH
Mechanical Q (Qms) 10.61
Electromagnetic Q (Qes) .40
Total Q (Qts) .38
Compliance Equivalent Volume (Vas) 103.8 liters /3.67cu.ft
Peak Diaphragm Displacement Volume (Vd) 213.00cc
Mechanical Compliance of Suspension (Cms) .63mm/N
BL Product (BL) 7.1 T-M
Diaphram Mass inc. Airload (Mms) 33.8 grams
Efficiency Bandwidth Product (EBP) 87
Maximum Linear Excursion (Xmax) 6.2mm
Surface Area of Cone (Sd) 344.9cm2
Maximum Mechanical Limit (Xlim) 10.0mm

I chose these BP102's over the standard Delta 10's because of the very low resonant frequency and usable frequency range (40Hz compared to 66Hz of the Delta 10!!!). I play 5 strings, and I need big bottom from a cabinet. I've had 4x10 cabinets with Delta 10's in them, some of the notes on the Low B kind of fall off the end there. Also wanted to make this cabinet 4 ohms to suit my Ampeg SVT 2 Pro. The Goliath II was originally 8 ohms.
200 watts per speaker would make this an 800 watt cabinet.

MASSIVE low end out of these speakers. Just massive. I think it has more low end than my Carvin RL115 cabinet. And when the speakers reproduce sound, the cones barely move. These speakers will handle anything you throw at them, very meaty and definately NOT lightweights. The speakers have a very warm and vintage sound to them. not trebly or "honky" at all. They do have a pretty good range to them, using them in a cabinet with an adjustable horn or tweeter will help and not be an issue if you want high end. If you turn the horn off, they just scream with thunder.

The only complaint I have is the relatively low sensitivity rating of the speakers. At 90.5dB, that's kind of low compared to the Delta 10's 99dB rating. That means that to equal the same volume, you'd have to put more power into the BP 102 than the Delta 10.
I also have a 2x10 cabinet loaded with the 1st generation Eminence Deltalite 2510. I'm guessing that speaker's dB rating is arounf 98dB, similar to the Deltalite II. Powering these 2 cabinets with one amp, that difference in dB rating is noticable. In order to make the cabinets blend together, I needed to to reduce my treble output by a few points. The 2x10 was sort of overpoweing the 4x10 in the upper mids. That being said, the 4xqo may sound better on top of a 1x15 rather than under a 2x10...but to be sure I'll have to try that and see what happens.

I'm sure these speakers are bulletproof. They're tough.

never dealt with Eminence first hand, so I'm not sure

Overall, I say they are a fantastic BASS speaker. Not a mid-range PA speaker than "can be used for bass"...They kill and emit fantastic low end. You sphincter will fail soon!