GRS RSB901-1 KIT COMPLETO Altoparlante da sostituzione per Bose 901 4-1/2" 1 Ohm

GRS - Great Replacement Speakers - MODELLO OTTIMIZZATO PER BOSE 901

KIT COMPLETO PER IL RESTAURO DI UNA COPPIA DI BOSE 901 - 18 PEZZI

This driver's parameters were carefully optimized to match the performance of the classic Bose® 901® loudspeaker systems. Individually or in multiples, replacing your legendary but aging speakers has never been easier—or achieved better results.

Highlights

Drop-in replacement for Bose 901 drivers
Each individual driver is hand checked and tested
Fits Series III, IV, V and VI models, and more
Optimized cone/coil/suspension for linearity and reliability
1 ohm nominal impedance
Premium-quality motor structure maximizes performance
 

Product Details

GRS RSB901-1 Replacement Speaker Driver for Bose 901 4-1/2" 1 Ohm

This driver's parameters were carefully optimized to match the performance of the classic Bose® 901® loudspeaker systems. Individually or in multiples, replacing your legendary but aging speakers has never been easier—or achieved better results. The top plate and T-yoke are Japanese-made cold forged low carbon steel. The flat back plate provides a uniform surface area to which the magnet is bonded, and the outside of the back plate is chamfered to maximize flux density in the gap. Critical attention has been paid to the pole piece and voice coil tolerances, thereby assuring high yield and immunity to mechanical issues. High-grade Y-35 strontium ferrite magnet material is utilized in the motor structure to ensure consistent motor force. The cone is made of long fiber New Zealand blue color pulp paper, an ideal material for cone applications and the foam surround of this driver make it almost identical to the original manufacturers appearance, design and performance. It's rigid and just "lossy" enough to produce full, accurate sound. A 2-layer low oxygen copper voice coil is wound on a high temperature resistant polyimide former. Every driver is hand checked and tested, based on a ±2 dB window.

NOTE: This driver has an impedance of 1 ohm, and should be used only to replace the 4-1/2" driver in the Bose 901 (Series III or later) and Bose 802™ loudspeakers. Compatibility with other Bose loudspeaker models or automotive audio systems has not been verified. This product is not manufactured or distributed by Bose Corporation™, the owner of the registered trademarks BOSE®, BOSE 802™ and BOSE 901®.

• Specifications for: RSB901-1 Replacement Speaker Driver for Bose 901 4-1/2" 1 Ohm
• Woofer Series
• Woofer TypeMidwoofer
• Nominal Diameter4-1/2"
• Power Handling (RMS)30 Watts
• Power Handling (max)60 Watts
• Continuous Program Power
• Impedance1 Ohm
• Sensitivity91.5 dB 2.83V/1m
• Frequency Response83 to 15,000 Hz
• Voice Coil Diameter1"
• Magnet Weight
• DC Resistance (Re)0.76 ohms
• Voice Coil Inductance (Le)0.11 mH
• Resonant Frequency (Fs)83.44 Hz
• Mechanical Q (Qms)2.4
• Electromagnetic Q (Qes)0.43
• Total Q (Qts)0.36
• Diaphragm Mass Inc. Airload (Mms)3.38g
• Moving Mass Of Diaphragm (Mmd)
• Mechanical Compliance of Suspension (Cms)1.08 mm/N
• Surface Area of Cone (Sd)66.6 cm2
• Volume of Displacement (Vd)
• BL Product (BL)1.767 Tm
• Compliance Equivalent Volume (Vas)0.24 ft.³
• Maximum Linear Excursion (Xmax)
• Driver's Mechanical Losses (Rms)
• Cone / Diaphragm MaterialPaper
• Surround MaterialFoam
• Voice Coil Wire MaterialCopper
• Voice Coil FormerKapton® / Polyimide
• Dual Voice Coil
• Basket / Frame MaterialPolymer
• Magnet MaterialFerrite
• Shielded
• Overall Outside Diameter5.2"
• Overall Depth2.17"
• Baffle Cutout Diameter4.02"
• Bolt Circle Diameter
• # Mounting Holes3
• Mounting Hole Diameter
• Sealed Volume0.06 ft.³
• Sealed F3182 Hz
• Vented Volume0.14 ft.³
• Vented F3104 Hz