(click on above thumbnails to
PRE-OWNED / SECOND HAND
STEREO 2-WAY / MONO
MADE IN USA!
Of all the crossovers out there, Furman are some of the most sought after
and certainly professional you will use. Comparable to Brooks Siren or
White. Full 24dB / Oct and on this particular unit a full 24dBv!!! (don't
know what that means? research it or stick with a cheap, Chinese Behringer /
Soundtech / Audio-Centron / etc.) If you're an audio pro, you didn't need
any of that info anyway, but had to get it out of the way, since I have
recently read some fairly humorous / ill-informed blogs on the web. Anyway,
on to the unit. It's a Furman X-324, Stereo 2-way / Mono-3-way, Balanced
I/O, crossover. I was a Furman dealer (yes, as well as a dealer for, Behringer, Yamaha, Peavey,
Crate, DOD, Digitech, Alesis, Crest, Fender, QSC, Crown, EV, and about 30
others I can't think of now) and anytime I was putting together a serious
rig for a client or myself, it was filtered through a Furman "Balanced"
Here's a ton of info from;
Check their web site when you get a chance!
Furman Signal Processing 24 dB/Octave Crossover X-324
* 24 dB per octave rolloff slopes
* Peak limiters with adjustable threshold and LED threshold indicators on
* 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
* De-tented frequency controls with recessed range
* 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 represents a breakthrough to the next generation of crossover
design. It offers a unique combination of features geared toward making
installation simple, reliable, and foolproof, while providing maximum
protection to valuable speakers and drivers. It features 24 dB/octave slopes
for maximum speaker/driver protection.
24 dB/octave / the X-324 has both stereo and mono modes.
Each crossover point tunes continuously over 4.35 octaves, and adds an
additional 3 octave span with use of 10X range. Frequency controls use
de-tented pots (41 detents) for their superior reliability and
re-set-ability, and the frequency range switches (and all other front panel
slide switches) are recessed to minimize the possibility of accidental
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
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
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.
* Model X-324B: 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
(not currently available from Oak Tree).
Un-balanced 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
Un-balanced 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, un-weighted.
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 roll
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.
Again, we have gone through it inside and out. The entire
unit look, performs and sounds great! You won't be
disappointed in this one. Measures standard 19" rack
width x 1.75" tall (1 space) x 8" deep. Includes our standard
90 day limited warranty.