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Stereo 3-Way Active Crossover
User Manual
Model K231
Sublime Acoustic, LLC
Features
Stereo 3-way Active Crossover for driving separate subwoofer, midrange and tweeter amplifiers
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Linkwitz-Riley crossover circuits, 4
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For Bi-Amping or Tri-Amping your sound system, or to add a sub-woofer to vintage audio systems lacking LFE outputs
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All analog design employing only the highest quality audiophile grade components:
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Burr-Brown audiophile grade op-amps
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Metalized Polypropylene Film capacitors
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Metal film resistors with 1% and 0.1% precision
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ALPS metal film potentiometers
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Crossover frequencies are selected through pluggable 'XO Frequency Modules'
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Wide range of XO Frequency Modules are available to support any crossover frequency (see list below)
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High, mid and sub channels are phase aligned to within fractions of a degree to eliminate distortion at the XO frequencies
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Stereo or Mono Subwoofer Output - Optional Subwoofer channel L/R mixer
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Supports Balanced and Unbalanced audio input and output signaling
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Sub, Mid and High output gain level front panel adjustments
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Baffle Step Compensation, Adjustable Gain, Selectable baffle size ranges
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Silent On/Off circuit – No loud 'Thump' when powering On or Off
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Can be configured for 3-way or 2-way active crossover operation
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Specifications:
Total Harmonic Distortion (THD): Better than 0.0005%
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Total Harmonic Distortion + Noise (THD+N): Better than 0.0028%
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Intermodulation Distortion (IMD): Better than 0.0058%
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Signal-to-Noise Ratio (SNR): 120dB
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Channel Crosstalk: Less than -83dB
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Frequency Response: Linear from 10Hz - 250KHz
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CMRR (balanced inputs/outputs): Better than 70dB
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Input Impedance: 20K ohms unbalanced, 40K ohms balanced
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Output Impedance: 200 ohms, AC coupled
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Input Signal Max: 5.5V
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Insertion Gain: Adjustable Sub, Mid and High channels -9dB to +8dB
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Filter Topology: Linkwitz-Riley, Constant Voltage, 4
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Enclosure: Black Aluminum Extruded Chassis
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Dimensions: 6.5"W x 6.5"D x 2.5"H
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Shipping Weight: 3 lbs
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Inputs:
Stereo Balanced: ¼" TRS Jacks
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Stereo Unbalanced: RCA jacks
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Power Supply: Wall Mount AC adapter, 100VAC to 240VAC input, 24VDC 500mA output, 12W
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Outputs:
Stereo Balanced High, Mid, Low: ¼" TRS Jacks
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Stereo Unbalanced High, Mid, Low: RCA Jacks
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We support the following Crossover frequencies:
Any multiple of 10Hz from 60Hz-200Hz (e.g. 60Hz, 70Hz, ... 200Hz)
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250Hz, 275Hz
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Any multiple of 100Hz from 300Hz-4000Hz
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Any multiple of 500Hz from 4500Hz-7000Hz
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8/22/2017
th
nd
order 24dB/Octave or 2
order 12dB/Octave filter slope
th
nd
Order 24dB/Octave, 2
Order 12dB/Octave
1
SUBLIME ACOUSTIC MODEL K231
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Summary of Contents for Sublime Acoustic K231
- Page 1 We support the following Crossover frequencies: Any multiple of 10Hz from 60Hz-200Hz (e.g. 60Hz, 70Hz, ... 200Hz) • 250Hz, 275Hz • Any multiple of 100Hz from 300Hz-4000Hz • Any multiple of 500Hz from 4500Hz-7000Hz • 8/22/2017 SUBLIME ACOUSTIC MODEL K231...
- Page 2 These functions result in greatly improved clarity and lower distortion of the sound that is produced. The block diagram below shows the primary functional blocks of the K231. The line-level audio signals, either balanced or unbalanced, enter from the left and are received and buffered by the ‘Balanced/Unbalanced Input Stage’ circuits. Note that the balanced and unbalanced inputs are both always active.
- Page 3 Active crossover circuits, like those used in the K231 , on the other hand, are built from the highest quality operational amplifiers (op- amps) and the filter functions are applied to the line-level preamp input signals instead of the high voltage amplifier outputs. These active filters are designed to be many orders of magnitude cleaner and more precise than the passives.
- Page 4 3-Way or 2-Way Active Crossover Configuration The K231 is primarily designed as a 3-Way crossover, but it can be configured as 2-Way crossover by plugging in a Sub-woofer XO module in the 12Hz range. This channels all frequencies above 12Hz (meaning all audible frequencies) to the Mid/High crossover. In this configuration your woofers would be driven from the Mid channel outputs and your tweeters from the high channels.
- Page 5 For simplicity, set the BSC to fully OFF, or counter-clockwise to start with. Turn on the power to your system and the K231. The initial sound will most likely be way too bright, as tweeters often have a higher sensitivity than woofers. Drop the level of the ‘High’...
- Page 6 8/22/2017 SUBLIME ACOUSTIC MODEL K231...
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