SPL Testing @ Ultra Low Frequencies                  Testing your car audio system  at its Peak SPL and at four set frequencies of  40Hz   33Hz   25Hz   20Hz  ////////////   The pd SPL format started booming in the U.K. in 2008.  Created by Marcos H Barnes A.K.A. Mega Heavy Bass. A former SPL competitor.//////////  dB readings are taken from the vehicles Head Rest    The doors and windows are allowed to be opened.   Like to know more?       ...Then please feel free to browse this site.       Thank You For Your Interest.           Copyright © 2011 by "Marcos H Barnes"
No manufacturers pay or sponsor pd.


Subwoofers featured here are here because they have performed well.

They could be reliable - Have High SPL
Good SQ sound - or a great all rounder.

Clicking on the subwoofer names on the left of the screen will bring up more general info about the subs.

Clicking on the main subwoofer title above the TV will take you to their website locations
Brand "X" Subwoofers
Digital Designs Subwoofers
JBL GT5 Subwoofers
Ascendant Audio Subwoofers
DC Sounds Subwoofers
Earthquake Subwoofers
HCCA Subwoofers
Copyright © 2011 by "Marcos H Barnes"