How low do they go?
Of the 210 here with a figure quoted, most are rated between 40Hz and 80Hz, with a median of 55Hz. 25 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 $289 and $5,000, with a median of $799 and a full range of $79 to $23,500. 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 86.0dB to 93.0dB, median 89.0dB. 112 of the 209 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?
59 of the 110 with the connection recorded have two sets of binding posts, so those can be bi-wired or bi-amped. It is worth knowing before you buy cable, but it is a long way down the list of things that change the sound - position and room treatment come first.
How big are they?
Most are 147mm to 269mm tall, median 190mm, and weigh 5.9kg to 25.2kg, median 10.9kg. Every listing gives height, width and depth in both inches and millimetres, so measure the space before you order rather than after.
Will it fit under my television?
Most are 430mm to 831mm wide, median 550mm. Height is usually the tighter constraint, since the speaker has to clear the stand and stay below the screen. If it will not fit under, above the screen is better than inside a closed cabinet, and either way aim it at the seats.