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SMS1 Instruction Manual Rev C Page 9

Technology

Crossover

The SMS1 has remarkable vocal

clarity. Much of this can be

attributed to the low-distortion

crossover design and to the choice

of the crossover frequency.

To achieve unusually low

distortion, the SMS1 crossover

uses some of the highest-quality

components available.

Film Capacitors

The SMS1 uses film capacitors

custom-built for Benchmark by

ClarityCap. Metalized

polypropylene film capacitors

produce much less distortion than

other types of capacitors. In our

opinion, ClarityCap builds the best

audio capacitors available. Each

capacitor is built to tight tolerances

at the exact non-standard values

required for our crossover.

ClarityCaps are also

mathematically modeled and

designed to minimize microphonic

effects that can cause high-

frequency distortion.

Air-Core Inductors

Most passive crossovers use at least one iron-core inductor. The iron-core reduces the size and

cost of the inductor, but the core can produce distortion. We chose to entirely eliminate iron-core

inductors from the SMS1 crossover. This choice eliminates harmonic distortion caused by low-bass

frequencies interacting with the iron core. This distortion usually adds clutter to the mid-bass and

vocal frequencies. In our listening tests, we preferred the clean sound of the 100% air-core design.

Strategic Crossover Layout

Crossover inductors can interact with each other and with the voice coils on the drivers. The SMS1

crossover placement and layout are specifically designed to minimize these inductive interactions.

This reduces unwanted variations in the frequency response while reducing the distortion that can

be caused by inductor crosstalk.

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Benchmark SMS1 Bedienerhandbuch Seite 9