Community R1 SERIES Owner's Manual download pdf (Page 14)

PAGE 12 Community R1 Series Owner’s Manual

7.2 SIGNAL PROCESSING

7.2.1 High-Pass (Low Frequency) Filter

The R1s use a horn-loaded low frequency driver. The specified low frequency response is 90 Hz. Any attempt

to reproduce significant levels below this frequency can result in over-excursion of the low frequency drivers.

For this reason an electronic high-pass filter set for 80 to 90 Hz must be used. The slope should be a minimum

of 12 dB per octave. This will protect the drivers from some of the extreme low frequency sounds found on CDs

and other program sources. It will also protect against unwanted low frequency energy that can come from

such things as microphone wind noise - an important consideration for outdoor applications.

Many power amplifier manufacturers offer plug-in high-pass filter input modules. This is an excellent method to

provide the necessary filter and to make it relatively tamperproof.

WARNING: Operating an R1 loudspeaker without the recommended high pass filter will reduce its low

frequency power handling and potential reliability.

7.2.2 Equalization

The R1s are designed with a high quality crossover that acoustically balances and matches the low and high

frequency drivers for optimum performance. However in some cases external equalization will be used to

"voice" the loudspeaker for particular applications or to attenuate feedback-prone frequencies. When equalizing

an R1 the following points should be kept in mind to achieve the best results and to avoid damaging the drivers.

1. Use only small amounts of equalization. In particular do not boost frequencies by more than about 3 dB.

When cutting frequencies more than 3 dB of attenuation is OK. Bear in mind that extreme frequency cuts will

usually result in less than optimum performance.

2. Do not attempt to boost any frequencies below 100 Hz with a graphic equalizer (See SECTION 7.2.1). Note

that with the recommended high-pass filter, moderate amounts of boost from a simple bass control are

acceptable.

8 PHYSICAL INSTALLATION

8.1 GENERAL MOUNTING INSTRUCTIONS

The R1s are equipped with 5 mounting points each consisting of a 1/2-13 threaded inset. Four of the points are

located at 90 degree intervals around the circumference of the body of the enclosure. They are located 16.5 in.

(419 mm) from the back of the horn mouth flange. The fifth point is located at the apex of the rear of the

enclosure bell. Each mounting point is shipped with a 1/2-13 x 1-1/4 in. (32 mm) stainless steel hex head bolt,

stainless steel flat and lock washers and a rubber friction/sealing washer installed. In all cases a minimum of

two of the points on opposite sides of the enclosure should be used to mount or rig an R1.

CAUTION:

When handling an R1 be careful not to scratch or scrape the powder coat finish on the

perforated metal grille. This finish protects the steel from corrosion. If the finish is scratched or otherwise

cut into in any way, the underlying steel will corrode at the point where the integrity of the finish has been

violated.

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Community R1 SERIES Owner's Manual Page 14