EAW BH-215-LR Specifications

Application

The BH-215-LR is designed for concert sound,

motion picture, high level playback, or any other sound

reproduction application where high output bass is required

down to the 40 Hz region. This vented horn is designed to

offer the finest performance available in applications

requiring crossover in the 500 to 800 Hz area. True

exponential design combined with unequaled quality

construction make this unit unparalleled in both sonic quality

and field durability.

Description

The  BH-215-LR is built to the highest standards in

the professional sound industry, with careful attention to

design and construction. The unit was designed to eliminate

the problems associated with typical low horn efficiency.

This was achieved by using a mathematically correct true

exponential horn flare, as opposed to the typical radial or

semi-exponential horns available. This design improvement

provides increased efficiency and smoother response. To

provide deep bass from a reasonably sized package, vent

loading is provided to the driver chamber enabling the usable

low frequency response to extend down to 40 Hz. The

direct radiating of the drivers maintains smooth response to

800 Hz with a roll-off above this, for crossover in the

favorable 500 to 800 Hz region (critical in many two-way

systems). The unique phasing shelf between the drivers

minimizes the interaction of the drivers, also adding to the

upper response of the system.

The LF-383-R drivers that are standard in the BH-215-

LR (also available as BH-215-UL without drivers) provide

smooth response and excellent deep bass performance.

These units will reproduce bass below 100 Hz, with a

minimum of distortion where the driver is often called upon

to make up for the failing efficiency of the system by

handling more power through low frequency equalization.

The LF-383-R's will handle this demanding use with ease,

while many other drivers will produce exceptionally high

levels of distortion and, in many cases, have a severely

shortened service life.

Construction

The BH-215 is the unit that EAW's world  famous

reputation  for quality and durability in enclosure

construction is based on. Thousands of these units are in the

field throughout the world. Day in and day out they

continue  to perform under the stress of heavy

professional use without failure or fatigue.

All exterior surfaces of the horn are fabricated w

cross-grain laminated Baltic birch hardwood, with 18 plys 

the inch. This multiple hardwood has a much higher streng

to weight ratio than ordinary plywood or particle boa

found in most other cabinets. In addition, the quality birch

an order in magnitude lower in panel resonances than oth

materials often used for bass horn construction, includi

fiberglass, compositeboard and simple plywood. The narro

band resonances which plague all competitive systems a

created by cabinet walls or the horn flare sympathetica

vibrating with the audio signal. This robs efficiency and al

creates a series of narrow band steep dips in the syste

response. To virtually eliminate resonances, the intern

construction of BH-215LR's uses a combination 

extensive internal bracing and specially develop

polyurethane reinforcing in the horn flare. This techniqu

exclusive to EAW, provides total freedom from cabin

resonances over the operating range of the system.

The BH-215's superior construction adds to it's va

in portable applications. Not only does it  haddto the sou

quality, but also makes it significantly more durable under t

rigors of road abuse. The BH-215LIR's all birch constructi

and catalyzed polyurethane finish make it moisture, chemic

and scuff resistant. Many options, including wheels, hand

and corners can be ordered for the BH-215-LR, but even

basic form it is a unique combination of sonic performan

and physical durability for any application.