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.
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 Specs
| 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): |
| 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: D-Max Limiter: |
In the Box
- Quested SM748 - Digital Crossover
- AC Power Cable
- One (1) Year Warranty
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