EAW BH-800-LR Specifications

Applications

These sound reproducers are designed to  provide  high

level sound of up to + 125 dB SPL covering the frequency range

from the deepest bass up to the fundamentals of  voice  and most

instruments. Ideal applications include live concert sound

reinforcement, motion picture and performing arts theaters, and

discotheque installations.

EAW professional  sound  reproducers  are designed with

portability  paramount. Their high strength -to-weight ratio  makes

them the products of  choice  among discriminating traveling

companies where ease of set -up and tear-down are important

considerations. Complete  road hardware  includes skids, handles,

steel  corner reinforcements,  scuff -resistant black polyurethane

finish, and Tee nuts  for the attachment of  user  selected caste rs.

Description

BH-800-LR Bass

Horn

This bent horn  reproducer  was designed to  eliminate the

compromises in performance that plague most  of  the folded or

straight designs currently favored by competitors. Using a specially

developed proprietary  thin laminated birch hardwood, EAW

developed a horn with a complex expansion characteristic in  two

dimensions to achieve  a truly exponential flare rate in  the critical

throat region.  This  throat is constructed as a sub -assembly and all

voids are filled  with a set -in-place polyurethane foam  that provides

maximum wall stiffness while damping any incipient resonances  in

the structure.

The horn portion  of  the reproducer  uses a very low

flare rate of 44  Hz and exceptionally large  mouth  (effectivelythe

entire frontal  area of the cabinet) for excellent  deep  bass  response.

The horn is constructed  of  18  plies-to-the -inch

crossgrained -laminated 

Baltic birch  hardwood with  the highest

stiffness -to-weight ratio of  any wood product available. The

resulting product sets a new standard  for smooth, deep bass

response at high sound pressure levels. The BH -800-LR will

outperform direct radiating and scoop-type horns in the range

below 250 Hz  and exhibits  higher conversion efficiency and lower

effective frequency response.

MR- 102-LR Mid-Bass

Reproducer

This  exponential horn provides high output at low

distortion  throughout the critical  mid band  that contains  fundamental

voice energy, and is typically the weakest link  in  previous  horn

loaded systems.

The MR -  102-LR is an exponential horn with a 175 Hz

cut -off frequency  at  the lower limit  and a maximum operating

frequency of  1,600 Hz.

A proprietary center displacement plug maintains the

exponential expansion rate throughout the throat region.  This plug

allows a proper  throat cross -section  to  optimize the smoothness  of

response over  the full frequency bandwidth of the horn. A  side

benefit of this design is that the plug reduces throat size with a

corresponding increase in efficiency. The plug also blocks  any

spurious high-frequency spikes from  the driver's  dust  cap from

entering the horn.

Frequency response of the MR -102-LR is driver

dependent, and although  the  horn exhibits a useful passband of  175

to 1,600 Hz, crossover points of  200 and 1,200 Hz are

suggested for best combination of efficiency  (typically 3 to  6 dB

better  than  most  horn -loaded  systems), low distortion, and

headroom. The use of the MR -102-LR  eases the load on the

midrange compression driver by raising the  system  crossover

frequency from the 600-800 Hz range to 1,200 Hz, where the

mid-range  unit  experiences less diaphragm travel. Mid-range

diaphragm replacement is dramatically reduced, and frequently

eliminated altogether, in systems where the MR -102LR is used  as  the

mid-bass  component.

Driver

Complement

EAW reproducers  are normally supplied, and function

most effectively, with the EAW/RCF drivers designed for them.

Each EAW product is designed as  an  integrated  system,  and the

selection of  values and dimensions for cone  materials, dust cap,

adhesives and damping  materials,  voice co il and magnet  structure

are carefully calculated  to  produce the best  overall  performance of

the system.

The LF -301-R driver used in the MR -102-LR  has been

special lly tailored with damping compounds to reduce break -up

modes above piston range and to permit optimally smooth

response to over 1,200 Hz. This damping eliminates  the high-Q

spikes present in most popular 12" drivers, and makes the

MR -102-LR much smoother  in the transition  region than  other

mid/bass cone  systems.

The LF -440-R driver used in the BH-800-LR uses an

18" diameter curvilinear cone  supported by a treated linen

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