movement of air

Discussion in 'Amps and Cabs [BG]' started by Jon Burnet, Apr 26, 2002.

1. Jon Burnet

Jan 21, 2001
Memphis, TN
Help me understand something. a 4x10 cab moves 40 inches of air correct? a 1x15=15? and a 1x12=12. well 2x12's would be only 24... afar cry from 40 from a 4x10. yet some people on this board say that the 12's crush the 10's. i love my peavey cab but the damn thing weighs about as much as a backstreet boy. so 2 1x12's sounds fun. hell i dunno. i play in a LOUD blues/r&b/jam band with a guitar player who runs 2 50 watt tube amps on 10 and a LOUD keyboard player. 4x10's cut it i was just wondering if 12's would.

2. FalsehoodBass

Jul 22, 2001
Denver, CO
a 4 10 has (4Pi times 25) square inches of surface area... a 15 has (Pi times 7.5 squared)

Surface area goes by the radius squared. The number on a speaker is the diameter, which is twice the radius.

there are also many other things to consider when considering how much volume you'll have.. not just surface area.

3. Jon Burnet

Jan 21, 2001
Memphis, TN
such as sensitivity i know. real worl is a pair of 12's gonna be as loud as a 4x10. i want the aggies or the genz and i have a peavey 4x10.

4. Nino ValentiSupporting MemberCommercial User

Feb 2, 2001
Staten Island NYC
Builder: Valenti Basses
It's not just speaker size. It's the design of the particular cabinet, the quality of the speaker, power handling og the speaker, ohmage of the cab, etc.

Are you talking about a Hartke 410 transporter compared to an Aguilar 212?

5. bgavin

May 3, 2001
Orangevale, CA 95662
The amount of air displaced for each driver is the piston diameter (Sd) multiplied by the Xmax.

A typical 10" driver piston is about 8.3" diameter.

Dec 11, 2001