MB QUART Premium PWM304 Manuale utente

PREMIUM

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

500-1000

30.48 cm / 12”

30-250

500-1000

30.48 cm / 12”

30-250

500-1000

30.48 cm / 12”

30-250

500-1000

30.48 cm / 12”

30-250

500-1000

30.48 cm / 12”

30-250

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

SERIES COILS /

PARALLEL SUBS

+4-Ohms

8-OHM

PARALLEL COILS /

PARALLEL SUBS

+1-Ohm

2-OHM

SERIES COILS /

PARALLEL SUBS

+2-Ohms

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

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