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The SM748 from Quested is a four-in,eight-out digital crossover.

With high-performance 24-bit digital converters and digital signal processing, the unit is able to capture and output program material with a high degree of accuracy. The converters run at 96kHz, a rate that yields a bandwidth of over 30kHz and a dynamic range in excess of 116dB.

 

The SM748 features up to nine parametric sections on each band.

Parametric sections can be reconfigured to provide alternate filter shapes, including an array of filters inclusive of phase adjustment in two-degree steps. Each output also features a combination of limiters, one that protect against driver over-excursion, and a second look-ahead limiter for additional safety.

Standard AES/EBU interfaces are built-in, allowing the unit to work with both digital inputs and digital output streams. Sample rate converters are included on the inputs, allowing the SM748 to accept digital audio with sample rates anywhere from 32kHz up to 192kHz. Output sample rate is fixed at 96kHz.

 

 

Features

  • Four-input, eight-output digital crossover that can be configured in multiple operating modes
  • 24-bit converters running at 96kHz for pristine sound quality
  • Eight parametric EQ sections per input
  • Nine parametric EQ sections per output
  • High and low pass filter
  • Two limiter types per output prevent driver over-excursion/over-driving
  • AES/EBU digital inputs and outputs
  • Sample rate converters available on the inputs

Quested SM748 - 4x8ch Digital Crossover

SKU: SM748
$6,999.00 Regular Price
$6,649.05Sale Price

Digital Crossover

Filter Type

Bessel/Butterworth/Linkwitz-Riley 12-24-48dB/8ve
Bessel/Butterworth 18dB/8ve

Operating Modes

Input: 2/4
Output: 4/6/8

Crossover Frequencies Parametric EQ (8 per Input / 9 per Output):
Gain: +15dB to -30dB in 0.1db steps
Frequency: 19.7Hz to 32kHz, 136 octave steps
Q/BW: 0.4 to 128 / 2.5 to 0.008
(Sections can be switched to shelving response)

High and Low-pass Filters (1 of each per output):
Frequency HPF: 10Hz to 16kHz, 1/36 octave steps
Frequency LPF: 35Hz to 22kHz, 1/36 octave steps

Gain Range

Input: +6dB to -40dB in 0.1dB steps
Output: +15dB to -40dB in 0.1dB steps and mute

Front Panel Switches

12 x Mute buttons
12 x Channel edit buttons
6 x Utility buttons
3 x Rotary encoders

Inputs

Analog: 4 x XLRf
Digital: Not specified by manufacturer

Outputs

Analog: 8 x XLRm
Digital: Not specified by manufacturer

Maximum Input Level

Not specified by manufacturer

Maximum Output Level

+20dBm into 600Ω

Frequency Response

20Hz to 20kHz, +1/2dB (-3dB @ 32kHz)

Dynamic Range

>116dB, 20Hz to 20kHz unweighted

Noise

Not specified by manufacturer

Display

2 x 24 character LCD
2 x 6 point input and 8 x6 point output meters

Dimensions

19 x 11.8 x 1.75" (482 x 300 x 45mm)

Weight

7.3 lbs (3.3 kg)

Specialties Program limiter and look-ahead "D-Max" limiter per output

Program Limiter:
Threshold: +22dBu to -10dBu
Attack: 0.3 to 90 mSec
Release: 2/4/8/16/32 x Attack time

D-Max Limiter:
Attack: 60µS
Release: Slow/Medium/Fast

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