Lowell 8A50-T870 Datasheet

Heard Everywhere Since 1947

pec No. 1448 | Rev. 04.22.15 | pg. 1/1

S

Model No.

8A50-T870

8" Coaxial Driver & 70V Transformer

Eight inch coaxial driver is the flagship of Lowell’s A-series and
represents an upgrade in performance over standard com­mercial coaxial drivers — with greater power handling, lower
distortion, and smoother musical sound. This driver is engi­neered for very high quality music and paging especially in
large venues such as restaurants, hotel lobbies, retail stores
and similar locations where the listening experience is a key
part of customer satisfaction.

Features

• 8" 50W coaxial driver with 20 oz. LF magnet coupled with

1.4" copper voice coil drive a polyproylene cone with half-roll
rubber surround for long cone travel and good edge damp­ing. Post-mounted tweeter is a 1" balanced-drive dome pro­tected by Ferrofluid and a first-order high-pass filter. Speaker
frame is stamped 20-ga. steel with black enamel finish and
zinc plated backplate.

• Mounted and wired 70V transformer (No. TLM-870) has pri­mary taps at 1, 2, 4, 8W

• Assembly frequency response 40Hz-19.4kHz (+
20kHz (+

• Assembly sensitivity 92.0dB avg. SPL (1W/1M)

• Assembly weight 4.4 lbs.

• Meets or exceeds all applicable EIA standards

7.1dB)

6dB), 40Hz-

with domestic and

global components.

A&E Specifications

The 8" driver with mounted transformer shall be Lowell Model
No. 8A50-T870 which shall be of the coaxial type having elec­trically independent high and low frequency transducers. The
low frequency section shall have an 8" diameter polypropylene
cone and the high frequency section shall have a tweeter with
a 1" balanced-drive dome. A built-in electrical crossover net­work shall be employed to accomplish the proper frequency di­vision between the 2 drivers. Crossover frequency shall be at
4000Hz with a first order high-pass filter. Power rating shall be
50 watts RMS. The low frequency voice coil shall have a di­ameter of 1.4" and operate in a magnetic field derived from a
ferrite (ceramic) magnet with nominal weight of 3.5 lbs. The
high frequency voice coil shall have 0.53" diameter and oper-

ate in a magnetic field derived from a ferrite (ceramic) magnet
with 2 oz. nominal weight. Voice coil impedance shall be 8 ohms.
The driver shall have a round, structurally reinforced stamped
20-ga. steel frame with 8.08" overall diameter and 8 obround
holes equally spaced at 45 degrees on 7.625" diameter mount­ing bolt circle. External metal parts shall be finished in black
enamel coating or zinc plating to resist rust and corrosion. The
mounted transformer shall be 70V with primary taps at 1, 2, 4,
and 8W. The assembly shall be capable of producing a uniform
audible frequency response over the range of 40Hz-19.4kHz

6dB), 40Hz-20kHz (+7.1dB) with a dispersion angle of 90 de-

(+
grees conical @2000Hz-6dB. Average sensitivity shall measure

92.0dB (SPL at 1W/1M). Overall depth shall not exceed 6.25".

Driver + Transformer Specifications

Driver + Xfmr. Driver Driver Driver Transformer Assembly Assembly Dispersion Assembly Assembly Max
No's. Type Power Rating Magnet Wt. Taps Frequency Response @2000Hz Octave (-6dB) Sensitivity Mtg. Depth SPL

8A50 + TLM-870 Coaxial 50W 20 oz. (woofer) 1, 2, 4, 8W 40Hz-19.4kHz (+

* Minimum depth required for assembly to be rear-mounted to grille in an enclosure.

** Calculated based on 8W maximum transformer power tap and measured sensitivity.

Additional information available on specification sheet for Driver No. 8A50.

Lowell makes every effort to provide accurate information while reserving the right to change specifications and/or improve manufacturing methods without notification.
©2015 Lowell Manufacturing Company, 100 Integram Dr., Pacific MO 63069 | 800.325.9660 | www.lowellmfg.com

8ohm 2 oz. (tweeter) @70V 40Hz-20kHz (+7.1dB) conical Avg SPL

6dB) 90 degrees 92.0dB 6.25" 101.0 **