Lowell C1830-870 Data Sheet
Lowell Manufacturing Company • 100 Integram Drive • Pacific, Missouri 63069 U.S.A.
Call 800.325.9660, 636.257.3400 • Fax 636.257.6606 • Click www.lowellmfg.com
Lowell makes every effort to provide accurate information and reserves the right to change specifications and/or improve manufacturing methods.
Download and print this spec from www.lowellmfg.com to insure that you have the most current information
2a-219
pg 1 of 4
Printed in U.S.A. © 03-15-05
WB8-8A50-T870
UL Listed 8”, 50W Speaker /Grille / Transformer Assembly
Quality Features
UL Listed - Standard 1480 - General Signaling
speaker/transformer/grille for use with backbox Model
ULXCP87.
Assembly includes 50W driver Model 8A50 with 70V
transformer Model TLM870 mounted to grille Model WB8.
Driver handles 50W input with 90dB avg. sensitivity.
Premium assembly exhibits smooth musical performance
with excellent power handling and low distortion for an
enjoyable listener experience in large/mid size venues.
Description
Lowell’s speaker/grille/transformer Model WB8-8A50-T870 is
listed under UL Standard 1480 - General Signaling. This UL
Listed Model features Lowell’s premium coaxial 8-inch driver
Model 8A50 with high performance TLM870 transformer
mounted to the popular WB8 white ceiling grille. The assembly is UL Listed for use with backbox Model ULXCP87
(required-order separately).
Model WB8-8A50-T870 is engineered for 70V distributed
applications that demand very high quality music and paging
reproduction in large/mid-size venues. Model 8A50 will provide
excellent sound quality in up-scale restaurants, lounges, hotel
lobbies, department stores, and boutiques where a positive consumer listening experience is key to customer satisfaction.
Driver Model 8A50 is a coaxial 50W 8-inch assembly that provides improved power handling, lower distortion, and
smoother more musical sound than most commercial coaxial
drivers. It features a large, 20oz magnet coupled with a 1.4inch copper voice coil driving a polyproylene cone with halfroll rubber surround for long cone travel and good edge
damping. The post-mounted tweeter is a 1-inch balanced
drive dome protected by Ferrofluid and a first order high
pass filter. Frequency response is 40Hz-20kHz+
6dB with a
crossover at 4 kHz. Additionally, the loudspeaker's capacity to
deliver a wide angle of sound distribution (110 degrees) over a
large area with uniform response and voice clarity ensures complete coverage with minimum units. The loudspeaker frame is
stamped 20-gauge steel with a black enamel finish and zinc
plated backplate.
The transformer is Model TLM870 with primary taps at 8, 4, 2,
1 watt and frequency response of 50Hz - 15kHz +
1dB. It is
securely mounted to the top of the driver.
The driver/transformer is mounted to grille Model WB8 which
is an attractive one-piece perforated steel grille finished in
durable white powder epoxy paint. The grille is 12.875” Dia
and mounts to the backbox using four 8-32 x 1.5” white
Phillips-head screws (included).
Backbox Model ULXCP87 is ordered separately and is
required to maint
ain UL Listing. It features a flat grille mounting flange for recessed installation in new drywall construction or tile ceiling applications where plenum space for a
large speaker system is limited. The 6.687”D acoustically
treated backbox is fabricated of welded, unitized heavy
gauge steel, undercoated and lined with 1.5” thick acoustic
batting to eliminate acoustic and metallic resonance. It
measures 10.063” Dia x 6.687”H. The backbox includes four
combination 1/2" - 3/4" conduit knockouts, 8-32 screw retaining U-clips on the flange for grille installation, and Lowell's
durable black powder epoxy finish.
For installations in suspended tile ceilings, a tile bridge is recommended to transfer the assembly weight to the ceiling grid.
Order Model LBS8 or LBS8R1 order separately (see pg 4).
Assembly Model WB8-8A50-T870
Front view of assembly grille (WB8)
ULXCP87 backbox
(required - order separately)
Ordering Information
UL Listed Driver Grille Xfmr Backbox Tile Bridge
Speaker Model (included) (included) (included) (Required - Order separately) (Recommended in tile ceilings)
WB8-8A50-T870 8A50 WB8 (12.875”Dia) TLM870 ULXCP87 (10.063”Dia x 6.687”H) LBS8, LBS8R1
WB8-8A50-T870
UL Listed 8”, 50W Speaker /Grille / Transformer Assembly
Lowell Manufacturing Company • 100 Integram Drive • Pacific, Missouri 63069 U.S.A.
Call 800.325.9660, 636.257.3400 • Fax 636.257.6606 • Click www.lowellmfg.com
Lowell makes every effort to provide accurate information and reserves the right to change specifications and/or improve manufacturing methods.
Download and print this spec from www.lowellmfg.com to insure that you have the most current information
2a-219
pg 2 of 4
AUDIO
12”/10”
Speakers &
Accessories
8”
Speakers &
Accessories
6”
Speakers &
Accessories
4”
Speakers &
Accessories
Horn
Speakers &
Accessories
Masking
Speakers &
Generators
Control
Accessories
& Electronics
Systems
PERFORMANCE
Power Handling 50 watts RMS (nominal) measured per EIA Standard RS-426A (70W in a 1/2 cu.ft. backbox)
Sensitivity 95dB SPL (peak), 90dB SPL (avg) measured 2.83V @ 1m
Impedance 8 ohms (nominal), 8 ohms @180Hz (minimum)
Frequency Response 40Hz-20kHz (nominal), 40Hz-20kHz (+
6dB)
Crossover Frequency 4000Hz, 1st order high-pass filter
Dispersion Angle 110° @ 2000Hz octave (-6dB)
PHYSICAL - WOOFER
Cone Material Polypropylene with rubber half-roll (up) surround
Magnet Weight, Material 20oz. (567g), strontium ferrite ceramic
Voice Coil Diameter, Material 1.4 inch (36mm), copper wire over aluminum former
Terminals Quick disconnect type - spade lugs
PHYSICAL - TWEETER
Diameter 2.05 inch (52mm) housing with 1 inch (26mm) Dia. balanced-drive dome
Magnet Weight, Material 2oz. (57g), ceramic
Voice Coil Diameter, Material 0.53 inch (13.5mm), copper wire and ferrofluid
MECHANICAL
Basket 20 gauge stamped steel with black enamel finish
Outside Diameter 8.08 inch (205mm)
Mounting Bolt Circle 7.7 inch (195mm) with 8 obround holes equally spaced at 45 degrees.
Cutout Diameter 7.2 inch (182mm)
Mounting Depth-Driver 3.85 inch (94mm)
Mounting Depth-Driver/xfmr 6.25 inch (159mm)
Net Weight-Driver 3.5 lbs. (1.6kg)
Net Weight-Driver/xfmr/grille 4.6 lbs. (2.09kg)
THIELE-SMALL PARAMETERS
Pe ......................50W Qts ........................0.68 BL ............................7.5Tm Sd ..........................33.2 in
2
, 214cm
2
Fs ......................52Hz Qes ......................0.87 Efficiency,ηη............0.47% Mms........................20.6g
Xmax ................0.21 in., 6mm Qms ......................3.1 Vas ............................29.2 liters, 1782 cu.in Cms ........................0.45mm/N
Re ......................7.2Ω
Transformer is factory
mounted to the top of the
driver
Specifications: Lowell Model 8A50 Coaxial Driver
Transformer Specifications
Mounted Xfmr Xfmr Xfmr Xfmr Xfmr
Xfmr Power Rating Primary (Pri) Taps (Pri) Response Insertion Loss
TLM870 8W 70V 1, 2, 4, 8W 50Hz - 15kHz +1dB 0.8dB
0.3 x 0.195 Obround Hole (8 Places)
8.062
2.375
7.625
3.750
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