MB QUART Premium PWM304 User manual

PREMIUM
PWM304
PWM304
Thank you for choosing the MB Quart PREMIUM subwoofer for your car audio sound
system. With proper installation, you are on the path to experiencing your music in a
way you only imagined possible. Here at MB Quart, we call this “Sound In Every Detail.”
The PREMIUM series subwoofers have been designed for the audiophile looking for
tonal balance and incredible output from their woofer. The PREMIUM series subwoofers
feature the following: - Quick Change Impedance Terminal
- Deep Drawn Stamp Steel Basket
- Heat-Dispersing Vented Pole Plate
-Anti-Resonant Magnet Cover
- Carbon Fiber Cone & Dustcap
- UV Resistant Butyl Rubber Surround
- 2.5” High Temp Voice Coil
- Red Nomex Spider

PWM304
500-1000
30.48 cm / 12”
30-250
4
500-1000
30.48 cm / 12”
30-250
4
84
500-1000
30.48 cm / 12”
30-250
4
84
500-1000
30.48 cm / 12”
30-250
4
84
500-1000
30.48 cm / 12”
30-250
4
84
500-1000
30.48 cm / 12”
30-250
4
84
84
315.3mm/12.41”
278mm/10.94”
183.6mm/7.23”
169.6mm/6.68”

PWM304
QUICKCHANGEIMPEDANCEFEATURE
The4-OhmdualvoicecoilsarewiredinSerieswhentheblockisinsertedwith
8-OhmshowingandinParallelwhen2-OhmisshowingontheTerminallabel.
Asshowninthediagramabove,changingtheconfigurationisquickandeasy.
Firmlygraspthelipoftheblockandpullfromtheterminal.Rotate180degrees
andre-insert.Pleasereviewpage4fordetailedwiringconfigurations.
TERMINAL
IMPEDANCE
BLOCK

PWM304
DVC4-OhmCoilWiring
PARALLEL COILS
-
+
2-Ohms
+-
2-OHM
SERIES COILS
-
+
8-Ohms
+-
8-OHM
SERIES COILS /
PARALLEL SUBS
-
+2.66-Ohms
+-
8-OHM
+-
8-OHM
+-
8-OHM
SERIES COILS /
PARALLEL SUBS
-
+4-Ohms
+-
8-OHM
+-
8-OHM
PARALLEL COILS /
PARALLEL SUBS
-
+1-Ohm
+-
2-OHM
+-
2-OHM
SERIES COILS /
PARALLEL SUBS
-
+2-Ohms
+-
8-OHM
+-
8-OHM
+-
8-OHM
+-
8-OHM

PWM304

SUBWOOFERINSTALLATION DIRECTIONS
EnclosureMaterials
Typically,5/8”or3/4”MDF(MediumDensityFiberBoard)isbest
formostapplications.3/4”MDFisrecommended.
EnclosureBuildMaterials
Connectingjointsneedtobegluedandscrewedtoensureno
airescapesandjointsdonotseparateunderhighpressure.
Miteredandrabbitjointsalsohelptoensuretheenclosurejoints
aresecure.
Bracing
Internalbracingisalsorecommendedtopreventflexingandto
strengthentheenclosure.
Note:Thevolumetakenupbythebracingshouldbeaddedtothe
totalenclosureinteriorvolume.
Therearetwocommonbracingmethods.
1.CornerBracing:Thesehelppreventtheconnectionjoints
fromseparatingunderheavyvibrationandairpressure.
Use1”x1”MDFatallinteriorjoints
2.DiagonalBracing:Theseinternalbracesconnectthetopside
tothebottomsideaswellfrontsidetobackside.Thisprevents
thewoodfrombowingorpushingoutwards.
Use1”x2”with1”surfacecontactthatisgluedandscrewed.
PWM304

Q Theenergylossesofrelativedamping(ratioofstoredtodissipated
energyorratioofreactivetoresistiveenergy).
Fs FreeairresonanceofdriverinHz.
Qms MechanicalQ.
Vas Volumeofairequivalenttodriverfromtherestposition.
Cms Mechanicalcomplianceofaloudspeakerpiston.
Mms Movingmassoftotalloudspeakerpistonassembly.
XmaxThemaximumlinearexcursionofaloudspeaker.
Sd Surfaceareaofthecone.
Dia Thepistondiameterofaloudspeaker.
Qes ElectricalQofasystem.
Re DCresistance.
Le VCinductance.
Pe Maximuminputpower.
Qts TotalQofthesystem.
SensSensitivity.AnefficiencymeasurementindB’s.
Vc Volumeofaclosedorsealedenclosure
Vb Volumeofaventedenclosure.
Fc Theresonantfrequencyofaclosedorsealedsystem
Fb Theresonantfrequencyofaventedsystem
F3 Thehalf-power(-3dB)frequencyofaloudspeakerenclosure
Qtc TheQofaloudspeakeratFcinaclosedbox,consideringboth
it’selectricalandmechanicalresistance.
QL TheQofaventedbox,resultingfromallboxlosses.
DV Diameterofvent.
LV Lengthofvent.
H Height.
W Width.
D Depth
GlossaryofTerms
PWM304
MBQUART SPEAKERS SPEAKER SYSTEM