View Single Post
Old 03-16-2006, 08:27 PM
NeverObsolete NeverObsolete is offline
Registered User
Join Date: Sep 2005
Location: Upper New York State
Posts: 538
Send a message via MSN to NeverObsolete Send a message via Yahoo to NeverObsolete
Furman Signal Processing 24 dB/Octave Crossover X-524

Community, is this a good crossover?
Furman Signal Processing 24 dB/Octave Crossover X-524

* X-524 4-Way Stereo


* 24 dB per octave rolloff slopes
* Peak limiters with adjustable threshold and LED threshold indicators on each output
* Slope switch gives Linkwitz-Riley/Butterworth choice
* Low Cut filters give response down 3 dB at 20 Hz, with 12 dB/octave slope
* Input and Output level controls
* Mute switches on each output with dual-color indicators
* Phase reverse switches on each output
* Compression driver/Horn EQ switches on high outputs
* Detented frequency controls with recessed range switches
* Low Sum switch gives L+R sum in stereo mode
* Ground Lift switch
* Balanced inputs with 1/4" TRS jacks are standard


The X-324, X-424, and X-524 represent a breakthrough to the next generation of crossover design. They offer a unique combination of features geared toward making their installation simple, reliable, and foolproof, while providing maximum protection to valuable speakers and drivers. All three feature 24 dB/octave slopes for maximum speaker/driver protection.

There are three 24 dB/octave X-series models to accommodate a variety of systems. The X-324 and X-424 have both stereo and mono modes; the X-524 provides stereo 4-way operation only.
Each crossover point tunes continuously over 4.35 octaves, and adds an additional 3 octave span with use of 10X range switches (except: no range switch for the X-524 subwoofer-low cross). Frequency controls use detented pots (41 detents) for their superior reliability and resettability, and the frequency range switches (and all other front panel slide switches) are recessed to minimize the possibility of accidental actuation.

A Slope switch allows you to select either Butterworth filter response curves (constant power sum) for long throw applications, such as large concert halls, or Linkwitz-Riley curves (constant voltage sum) for near field uses, such as studio monitoring or whenever components are time or phase aligned (click here for additional information on Crossover Slope selection).

Recognizing the need in large multi-way sound reinforcement systems for control of signal peaks which can exceed a driver's power handling ability, each output of the 24 dB X-Series crossovers includes a fast-acting peak limiter. These limiters not only protect expensive drivers from damage, but also stop distortion-causing transients while having minimum effect on the rest of the program. Screwdriver-adjust Limiter Threshold controls for each output, variable from -20 to +20 dBu, allow customizing the maximum output level to match any combination of amps and drivers. This feature allows your system to run louder and longer, while giving protection from catastrophic failure. An LED next to each output level control indicates when limiting is taking place.

To assist in system checkout and fault identification, each output features a Phase Reverse pushbutton and a Mute pushbutton. The Mute buttons have dual-color LED indicators that glow green to indicate normal operation and red when the associated output is muted.

A switch-selectable function called Horn EQ conveniently eliminates the need for an outboard equalizer to achieve the compensation (see Specifications) needed when using compression drivers.
On the rear panel, a Low Sum switch operational in stereo mode gives the option of summing the low frequency left and right outputs together and feeding the L+R mix to both low outputs. This choice generally has negligible effect on stereo separation since there is little directional content in the lowest frequencies, and often gives more satisfactory results in stereo sound reinforcement systems by assuring that the low frequencies can be heard equally well at all locations.

A ground lift switch allows the option of isolating the signal ground completely from the chassis, eliminating hum-causing ground loops without disturbing the AC safety ground. Balanced inputs on tip-ring-sleeve phone jacks are standard. Ultra-low distortion (less than .01% T.H.D.) and noise (-78 dBu E.I.N.) make the X-24 Series the cost-effective choice for trouble-free crossover installations.

* Models X-324B, X-424B, and X-524B: All inputs and outputs balanced with both phone and XLR connectors. Both output connectors can be used simultaneously, allowing signal splitting. Instrumentation-type differential input preamps offer extremely high common-mode rejection.
* Accessories: Models SC-1, SC-2 Security Covers: Black anodized aluminum universal security covers, for one or two rack spaces, prevent unauthorized tampering with controls. When access to the controls is required, the SC-1 or SC-2 may be removed with a screwdriver, without dismounting the underlying equipment from its rack. Click here for a picture of the SC-1 and SC-2 Security Covers.


Standard: Input impedance: 10K Ohms tip to ground, 20K ohms tip to ring. Maximum input level: Depends on level control. Gain: 6 dB maximum. Connectors: 1/4" TRS phone only.

Balanced: Differential input impedance: 20K Ohms. Maximum input level: 8.7 Vrms (+21 dBu) Gain: 6 dB maximum. Connectors: Both XLR and TRS phone. Common Mode Rejection: >85 dB below 500 Hz; >62 dB at 10 KHz

Standard: Output impedance: Less than 200 Ohms. Gain: 6 dB maximum. Maximum output level: 8.7 Vrms (+21 dBu) with a minimum terminating load of 2.5K Ohms. Connectors: 1/4" TRS phone.

Balanced: Output impedance: Less than 200 Ohms. Gain: 6 dB maximum. Maximum output level: 17.4 Vrms (+27 dBu), with a minimum terminating load of 5K Ohms. Connectors: Both XLR and TRS phone, may be used simultaneously.

Freq. Response: +0, -.5 dB, 20 Hz to 20 KHz.
Distortion and Noise: Less than 0.01% THD with input and output levels up to +21 dBu, from 20 Hz to 20 KHz; less than 0.003% THD at 0 dBu input and output levels, from 20 Hz to 20 KHz.
Crosstalk: Less than -80 dB, Ch. 1 to Ch. 2 with 2 KHz tone in Ch. 1 at 0 dBu in and out.
Output Noise: -78 dBu, 20 Hz to 20 KHz, unweighted.
Dynamic Range: 99 dB from noise floor to maximum output.
Frequency Ranges: X-324: 35 Hz to 700 Hz with X1/X10 range switch. X-424: 20 Hz to 400 Hz with X1/X10 range switch (low-mid) and 135 Hz to 2.7 KHz with X1/X10 range switch (mid-high). X-524: 15 Hz to 300 Hz (subwoofer-low) and 35 Hz to 700 Hz with X1/X10 range switch (low-mid) and 135 Hz to 2.7 KHz with X1/X10 range switch (mid-high).
Filter Slope: 24 dB/octave, switchable for Butterworth (constant power sum) or Linkwitz-Riley (constant voltage sum).
Limiter: Attack: 8 ms; Release: 1 sec.; Threshold: From -20 dBu to +20 dBu.
Horn EQ: +12 dB at 18 KHz; rolls off at 12 dB/octave above 22 KHz.
Low Cut Filters: -3 dB at 20 Hz, 12 dB/octave rolloff.
Construction: Steel chassis, zinc chromate plating; 1/8" thick pale grey powder-coated steel front panel; glass epoxy PC boards.
Dimensions: 1 3/4" (X-324) or 3 1/2" (X-424 and X-524) H x 19" W x 8" D.
Weight: X-324: 7 lbs (3.3 kg). X-424, X-524: 11 lbs (5 kg).
Power Requirement: X-324: 8 Watts. X-424: 12 Watts. X-524: 16 Watts. 120 VAC 60 Hz, or 230 VAC 50/60 Hz versions available.
Safety Agency Information: UL, C-UL, and CE listed.

0 dBu equals .775 Vrms. Outputs can be connected to less than the indicated minimum load without damage or excessive distortion, but maximum output levels will be reduced. Limited Warranty: One year, covering parts and labor.
Reply With Quote