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Summary of Contents for Blaupunkt PC8
- Page 1 rofessional Quality Subwoofers Technical Manual For: Manuel Tkchnique Pour: Manuel Tbcnico Para:...
- Page 2 TOPICS PAGES New Pro Component features System design guidelines Subwoofer enclosure types Subwoofer enclosure construction System installation guidelines Additional reference information Limited warranty information Technical support PC 8 technical specifications and recommended box designs PC 10 technical specifications and recommended box designs PC 12 technical specifications and recommended box designs PC 15 technical specifications and recommended box designs Technical support summary sheet (fax sheet)
- Page 3 SUBWOOFER ENCLOSURE TYPES discusses the trade-offs of popular box designs with SUBWOOFER ENCLOSURE CONSTRUCTION reviewing basic box building techniques. to learn more about car audio. BLAUPUNKT WARRANTY INFORMATION for the applicable country is noted. BLAUPUNKT TECHNICAL SUPPORT provides telephone and fax...
- Page 4 IMPROVED PERFORMANCE PARAMETERS for the new PC units were strategically balanced so that low resonant frequencies could be achieved along with high sound pressure levels. Cone mass is held to a minimum for high efficiency yet its Acrylic Resin Laminate (ARL) design yields tremendous rigidity.
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Page 5: System Planning
SYSTEM PLANNING The largest possible impact on any audio system (home or car) is the quality of loudspeakers used and their placement. EFFICIENCY defines how loud a speaker will play for a given input power and is often quoted at 1 watt input and measured at a 1 meter distance. - Page 6 COMMON ENCLOSURE TYPES In the car audio world there are 5 types of subwoofer enclosures commonly used; INFINITE BAFFLE, SEALED BOX (closed box), VENTED BOX (bass reflex), SINGLE-VENTED (often incorrectly referred to as “7th” order). No single design is superior because each has its own compromise in performance, power handling, and design complexity.
- Page 7 ISOBARIC WOOFER CONFIGURATIONS Increasing in popularity in recent years is the compound woofer design, more commonly known as the “Isobaric” design. Isobaric actually means “constant pressure” which is the case having two woofers moving an encapsulated pocket of air between them in the same direction.
- Page 8 During box construction, temporarily assemble the box to make sure all pieces line up properly. Then assemble all pieces before cutting out the holes for the woofers. Once the box is fully assembled, connect an oscillator/amplifier to the woofer, sweep it through 20-100 Hz, and listen for strange air whistling noises, buzzes, and rattles.
- Page 9 IBM personal computer program used to predict the frequency response of a subwoofer in 10 different enclosures including sealed, vented, bandpass, and isobaric configurations. wo woofers can be graphically compared in different boxes if desired. In addition, it will are included. The program is sold through authorized Blaupunkt retailers and distributors.)
- Page 10 To obtain performance of this warranty, contact the nearest Blaupunkt dealer. A dated purchase receipt or other proof that the product is within the warranty period will be required in order to honor your claim.
- Page 11 8” SUBWOOFER - TECHNICAL DATA Nominal diameter in (200mm) Magnet weight 2 0 oz (5689) Nominal impedance (Re) DC resistance 2.42 R (fs) Resonance frequency 44 Hz Total Q factor (Qts) 0.39 (Qms) Mechanical Q 10.3 Electrical Q (Qes) 0.41 (Vas) 0.86 ft3 (24.3 Itr’s: Air volume displacement...
- Page 12 SEALED BOX, 0.25 vs. 1.50cu.ft. _ _ _ _ _ _ _ _ _ _ _ _ VENTED BOX, 0.5 vs. 1.0 cu.Et. SINGLE-VENTED 1.0 vs. 1.5 cu.it. 1.5 cu.rt. [The data above is offered as a “starting point” for comparison purposes because these designs are only a few of many possible box configurations.
- Page 13 10” SUBWOOFER - TECHNICAL DATA + Nominal diameter 10.0 in (250mm: Magnet weight 40 oz (11409) Nominal impedance DC resistance (Re) 3.00 n Resonance frequency (fs) 40 Hz Total Q factor (Qts) 0.38 Mechanical Q (Qms) 9.27 Electrical Q (Qes) 0.40 (Vas) (53.8 Itr’s...
- Page 14 ‘SEALED SEALED BOX, 0.5 "B. 1.5 cu.ft. bsnd 0.75 1.00 ‘ 1 . 5 0 VENTED BOX, 0.5 VI!!. 1.5 cu.ft. 1.25 vs. 1.75 cu.ft. possible box configurations. Be sure to account for the air volume displacement of the woofers and the port tubes.
- Page 15 12” SUBWOOFER -TECHNICAL DATA Nominal diameter 12.0 in (300mm Magnet weight 40 02 (11409) Nominal impedance DC resistance (Re) 2.10 n Resonance frequency (fs) 34 Hz Total Q factor (Us) 0.40 Mechanical Q (Qms) 9.80 Electrical Q (Qes) 0.42 (Vas) 3.40 ft3 (96.2 ltr’: Air volume displacement 0.18 ft3 (5.1 Itr’s)
- Page 16 SEALED SEALED BOX, 0.75 vs. 2.0 cu.ft. 1.00 1.50 Trunk 172 VENTED VENTED BOX, 0.75 "8. 2.0 cu.ft. Total SINGLE-VENTED 3.5 CU.ftz. Frsq. Frsq. Port Vented Sealed Port tune front tube tubs band length length for 4” I. D. I. D. (cubic (cubic (cubic ( H Z ) ( H z ) ( H Z ) fes1)
- Page 17 15” SUBWOOFER -TECHNICAL DATA Nominal diameter 15.0 in (380mm: Magnet weight 40 oz (11409) Nominal impedance DC resistance (Re) 2.08 $I2 Resonance frequency (fs) 24 Hz Total Q factor (Us) 0.38 Mechanical Q (Qms) 7.10 6.70” Electrical Q (Qes) 0.41 12.1 ft3 (342 Itr’s: Air volume displacement 0.35 ft3 (9.9 Itr’s)
- Page 18 SEALED BOX, 1.5 vs. 3.0 CU.ftz..VENTED BOX, 1.5 V6. 3.0 Cu.ft. SINGLE-VENTED 3.5 vs. 6.0 cu.ft. possible box configuralions. Be sure.to account for the air volume displacement of the woofers and the port tubes.
- Page 19 DAYTIME FAX: TODAY’S DATE: What enclosure type do you have or want? What Blaupunkt woofer model numbers are you working with? ow many woofers are in the same cabinet? Diameter and length of each? Do you want round (PVC pipe) port tubes or square? [ ] round...
- Page 20 Robert Bosch Corporation Sales Group - Blaupunkt Division 2800 South 25th Avenue, Broadview, Illinois 60153 Division Blaupunkt de Robert Bosch Inc. Mississauga, Ontario Canada L5N IRl Copyright 1993 by the Robert Bosch Corporation No portion of this work may be reproduced in any form without the written consent of the Robert Bosch Corporation Printed in the U.S.A.