How low do they go?
Of the 174 here with a figure quoted, most are rated between 28Hz and 65Hz, with a median of 46Hz. 46 of them are quoted at 40Hz or below, which is roughly where a soundtrack's low effects and the bottom of a bass guitar live. Makers measure this differently, so use the figure to rank models rather than as a promise.
What do they cost?
Most sit between $440 and $4,240, with a median of $1,000 and a full range of $129 to $17,590. Prices are for a pair unless the listing says otherwise. These are the current asking prices we hold, not sale prices, and they move - check the retailer before deciding.
What amplifier do they need?
Sensitivity here is mostly 87.0dB to 93.0dB, median 89.0dB. 102 of the 182 that state a nominal impedance are 8 ohms. Every 3dB of sensitivity is worth as much as doubling the amplifier's power, so a sensitive speaker needs far less amplifier than an insensitive one of the same size. Read the minimum impedance as well: a nominal 8 ohm speaker that dips to 3 ohms is the harder load.
Can they be bi-wired or bi-amped?
None of the 88 with the connection recorded have a second set of binding posts, so bi-wiring and bi-amping are not an option in this class. That is normal for it, and it is a long way down the list of things that change the sound.
How big are they?
Most are 235mm to 674mm tall, median 332mm, and weigh 1.9kg to 15.9kg, median 4.1kg. Every listing gives height, width and depth in both inches and millimetres, so measure the space before you order rather than after.
Will they fit my wall?
The cutout and the depth decide it, not the outside dimensions. Cutout widths are mostly 6mm to 13mm. Mounting depths are mostly 3mm to 4mm, median 4mm. Check the depth against your wall build and check for a stud or a pipe where you intend to cut, before you cut.