Created by Marcos Barnes.
As a bit of fun to see how well car audio systems perform at playing low bass.

At the time Marcos was a dB drag competitor and a M.E.C.A. SPL competitor / SPL judge.

The pd test was added onto the end of the main M.E.C.A. SPL competition  as a sort of bonus SPL test.

The testing process tested the systems  peak frequency then 4 set frequencies of
40Hz - 33Hz - 25Hz  & 20Hz

All readings taken from the head rest using a Term Lab Pressure Sensor.

People liked it!
Andrew of Adassa Audio who was the U.K. Head of M.E.C.A ,ran into difficulties.
So the M.E.C.A. SPL format in the U.K. was closed down

Without his help in allowing the pd testing to be carried out after his events this format may have never started.

So a Thanks here.
To Adassa Andrew for that.

So. After this had finished...

pd testing was done at some Car Shows and few cruises and meets.

Resulting in a Finals Event @ Motorguard...

Marcos Barnes has the first system in the U.K. to hit over 150.0dB @ 20Hz

The motorguard event was a very good success.
Thanks to Paul Coughlin (Mazdawg) for his help. a legal cruise set up at the old Mean Street Cruise site in  Arena Essex Raceway started this year and they wanted an SPL event...

So (((pd))) jumped on board
and have held events there every 1st sat of each month from May till October.

Again this wouldn`t have happened if it wasn`t for the badgering of
Henry (Proffessa) to get something going back at the old mean street cruise site.

ICEMAN Ian Pinders Orion HCCA system is the first to get an average of 155dB+
The fixed venue works well and lots of new people have been attracted to the event.

Again many thanks to the team @

U.K. dB drag and (((pd))) team up to hold events where the competitors of both different types of SPL formats are encouraged to give each others SPL a go.

A nice event.

Helping to bring more awareness to both SPL formats.

Richard VXincar is the first person in the U.K. to   hit 150.0 dB+ figure in the boot classes.
Using 4x Orion HCCA 12" and 8000wrms of power.

The Joose
(Project Big Black)

Is the 1st to hit over
155dB @ 20Hz!!!

(((pd))) gets its own forum area on the
Car Audio Forum.
Thanks to the team @

takes its first step into new territories and enters Europe via
Swedens Car Audio

Another European Country... Holland is also considering taking on the (((pd))) format.

Below is a brief run down of the (((pd))) formats history and a few memorable score details.
2006                        2007                        2008                        2009                         2010
                                 Antoine ( THE GENERAL ) of De-Bunker Audio in the Netherlands takes (((pd))) to new heights in Europe
                                 Already sponsored by some leading manufacturers the SPL format is a great success and every event is
                                 attracting more people.

S                               Sad news  this year as we lose one of our most crazy bass heads - Joe Agii
U.K. Distributer for Earthquake Died in August. 
                                 He was always pleased to help people, his enthusiasm for bass was immense and anyone
                                 spending 5 mins with him would soon be converted into a full on "Must have more Bass"
                                 Bass Head.
                                 He will be missed by all of the U.K. bass community.
(((pd))) Europe is HUGE!! Events are getting very busy with over 60 competitors giving it some in the SPL lanes.
(((pd))) have multiple sponsors in Europe.
(((pd))) gets its FIRST 150.0dB AVERAGE Boot Boomer!
2x DC sounds 15"s and 5000wrms of power.

Total Average Score = 150.8dB
Peak = 151.2dB @ 33Hz
40Hz = 150.2dB
33Hz = 151.2dB
25Hz = 149.9dB
20Hz = 147.9dB
Well Done to Stewart Jevons!
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"
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2013:  The UK`s First 160dB+ systems.
Wayne Higley`s Golf - First to hit over 160dB!
...12 Hours Later - Mark Smiths Volvo also hit over 160dB!
Stuart Jevons is raising the bar again.
The UK`s First 150dB @ 20Hz Boot Boomer.
NO-WALL systems builders are going crazy.
This year sees more LOUDER! NO-WALL set ups than ever.
(((pd))) UK - Gets its first ever Sponsor.
(((pd))) UK now has Multiple Sponsors
2014:  The UK`s First BB4 system to hit 150dB.
NO-WALL systems builders are going crazy.
This year sees more LOUDER! NO-WALL set ups than ever.
MUSHY of Team
Hz Addiction

Celebrating his 150dB with a well deserved CIGAR!
1st to Average 155dB
Steve Salisbury - Team Waffle
Steve Harringtons Loudest Ever No-Wall System.
Another LOUD System
(((pd))) UK - Visit (((pd))) Europe @ The Automaxx Summer Edition event - Good times were had by all - Roll on next year..........
Sanders of Europe takes (((pd))) Loudest EVER system title - Averaging over 159dB