Thunderchild 112v3: Switchable between 4 and 8 ohms; Dimensions 22" tall x 14" wide x 14" deep; 31 pounds; 94 dB; 500 watts; -1 dB at 62 Hz with normal tuning; four pluggable ports give four ported and one sealed option (for adapting to different room acoustic situations); top end switchable between 3.5 kHz and 17 kHz (-3 dB points), midrange switchable between smooth and a just a hint of grindy in the upper mids. Woofer is the stock 4-ohm version of the Kappalite 3012LF variant. Price: $850 + shipping.

The Thunderchild 112 is like a high quality light PA cab that goes deep enough and is rugged enough for electric bass.  If you want to hear the pure sound of your instrument with no editorializing by the cab, the Thunderchild series can do that and do it well.  But the smoothness of the Thunderchild cabs also means that they do not have a traditional electric bass cab voicing.

The "4/8 ohm" switch works like this:  The woofer starts out as a "high 4 ohms woofer" and the switch adds just enough series resistance so that the load the amplifier sees becomes, in effect, an "8 ohms nominal" load.  The actual difference in impedance is much less than these numbers imply.  When engaged, the switch reduces the efficiency by about 1 dB and reduces the voltage sensitivity by about 2 dB, but in turn you can safely parallel the cab with another 8 ohm cab for a loud gig.  The switch can be omitted if desired, reducing the price by $50 and reducing the weight by 1 pound. 

The "Acoustic Friendly" option: Reduced-level rear-firing tweeter that adds a bit of top-end energy to the reverberant field and therefore comes a little bit closer to mimicking an actual acoustic instrument, and also lets anyone behind the cab (drummer perhaps) hear the overtones a bit better. More useful for upright bass than for electric bass. Adds about 1.5 pounds to the cab and $100 to the price.

Showing optional Acoustic Friendly

Rear Firing Tweeter

Thunderchild 112