Instruction manual

SMS1 Instruction Manual Rev C Page 10
Non-Inductive Wire-Wound Resistors
Wire-wound resistors have excellent temperature coefficients. This prevents changes in resistance
that can occur when resistors are heated by music power. Crossover resistors dynamically change
temperature at the peaks of music waveforms. The low temperature coefficient keeps the
resistance constant and prevents thermally-induced distortion.
The resistors used in the SMS1 are also specially wound to minimize inductance. This construction
eliminates interactions between the resistors and inductors, while producing a resistor that behaves
in an ideal manner.
3 kHz Crossover Frequency
The SMS1 uses a higher crossover frequency than most 2-way speakers of similar size. Most 2-
way speakers place the crossover right in the middle of the vocal band. At 3 kHz, the SMS1
crossover is comfortably above the vocal range and this improves the clarity of the vocals.
SpeakON NL2 and NL4 Cables and Connectors
The NL4 connectors on the SMS1 provide very low impedance connections and
are rated for high-current professional applications. The NL4 connectors are
rugged, reliable, and easy to use. In our tests, they consistently outperformed
binding post connections. The NL4 connector can be used with four-pole NL4
plugs, or two-pole NL2 plugs.
The NL4 connectors also prevent polarity reversals, loose
wires, and short circuits. We highly recommend selecting NL4
or NL2 cables instead of cables that use traditional binding-post
terminations.
The Benchmark AHB2 power amplifier is also equipped with
NL4 SpeakON connectors. This makes system set-up quick,
easy, and reliable.
Use a pair of two-pole NL2 to NL2 cables to connect one AHB2 power amplifier to a pair of SMS1
speakers operating in NORMAL mode. Use a pair of four-pole NL4 to NL4 cables to connect two
AHB2 power amplifiers to a pair of SMS1 speakers operating in BI-AMP mode.
Woofer
The proprietary 170 mm (6.7") woofer features a copolymer cone and a long excursion. It is
specifically designed for use in our acoustic suspension cabinet.
Tweeter
The 25 mm soft dome tweeter was selected after extensive listening tests. It provides clean,
accurate, and detailed high-frequency output with low unit-to-unit variance.