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Definitive Technology BP10B Specification Sheet

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EFINITIVE TECHNOLOGY’S

first product is an unusual loud-

speaker that offers exceptional

performance for its size and

price. The BP10 is a slender columnar speaker

measuring 42 inches high, 9 inch-

es wide, and 11 1/2 inches deep and

weighing about 60 pounds. Its exterior is

completely black, and the four sides are

covered by a fabric sleeve that fits snugly

around the enclosure. The wood base and

top plate have a glossy lacquer finish. The

top cap is also available in solid oak. The

gold-plated, multiway terminals, which

accept dual banana plugs, are under the

Stereo Review

TEST REPORTS

D

EFINITIVE

T

ECHNOLOGY

BP10 B

IPOLAR

S

PEAKER

S

YSTEM

“...a truly outstanding speaker system.”

Julian Hirsch, Hirsch-Houck Laboratories

D

base, with a slot for the connecting cable.

There is no visible indication of the

number, size, or configuration of the driv-

ers. Actually, the BP10 is a bipolar system

(hence the “BP” designation) containing a

pair of identical two-way speakers. One

faces forward conventionally, and the oth-

er is on the rear panel, facing backward.

Each consists of a 6 1/2-inch woofer and a

1-inch dome tweeter, with the woofer lo-

cated at the top of the cabinet and the

tweeter just below it.

Since the front and rear halves of the

system radiate in phase over their full fre-

quency range, their bass outputs augment

each other. In this respect, the BP10 is un-

like dipole radiators such as large electro-

static speakers or similar planar systems

in which the front and rear surfaces radi-

ate out of phase and tend to cancel each

other at low frequencies. Another result of

the BP10’s bipolar design is that it oper-

ates best placed about 8 to 12 inches out

from a wall—unlike planar systems,

which must normally be placed several

feet away from a wall.

The BP10’s two woofers share a com-

mon enclosure vented by a single ducted

port at the bottom of the rear panel. Ac-

cording to the manufacturer, the bass-

tuning system was computer-designed to

duplicate the loading of a transmission-

line system in respect to its bass response

and transient behavior while retaining the

advantages of a simpler and less ex-

pensive cabinet.

There was no skimping on the design of

the cabinet, however. Its sides are made of

3/4-inch particleboard, with front and rear

panels of 1-inch-thick Medite (a highly

rigid composition material) and extensive

internal bracing. The cabinet’s rounded

edges and narrow profile, plus its frame-

less cloth grille “sock,” are designed to

minimize diffraction, which can impart a

boxy coloration to the sound and mar the

spatial imaging.

If it becomes necessary to replace a

driver or perform other internal servicing

of the speaker, lifting the top plate reveals

the drawstring that keeps the grille snug to

the cabinet. After the drawstring is loos-

ened, the grille can be slipped down or re-

moved for access to the drivers or the

crossover network. The designers chose a

fourth-order Linkwitz-Riley network to

give the BP10 uniform response in the

crossover region as well as optimum

phase and transient response. The cross-

over frequency is not specified, but our

measurements suggest that it is in the vi-

cinity of 2,000 Hz.

The BP10 uses rugged, high-quality

drivers. The woofers have cast-

magnesium baskets, mineral-filled homo-

polymer cones with butyl rubber sur-

“Definitive Technology’s

first product is an unusual

loudspeaker that offers

exceptional performance…”

Latest BP10B speaker

is even better