VFX-2A
The AMCRON VFX-2A provides continuously variable filters which can be used to perform either crossover or band pass functions. The dual channel unit employs two filters per channel, each continuously variable from 20 Hz to 20 kHz. Filter rolloff is at a fixed 18dB/ octave.
Setting both low and high pass filters in one channel to a common frequency provides a two-way crossover at that frequency. Cascading both channels together provides a combined band-pass filter and 2-way crossover, or a three way crossover.
A variable gain bridging input is provided for each Channel in addition to the unity gain unbalanced input. Output impedance is 300 ohms in both inverted and non-inverted modes, with over 6 volts maximum output into 600 ohms.
Overall noise and distortion are extremely low, with I M distortion less than .01% at rated output, and noise more than 100 dB below rated output with O dB gain.
*The VFX-2A may be rack mounted, or as shown, an optional cabinet is available.
VFX-2A Specifications
Frequency Response
±0.1dB 20Hz to 20kHz with IHF load. Typically ±0.2dB 2Hz to 58kHz with IHF load, ±0.5dB 18Hz to 38kHz with 600 load. All tests with filters flat and at rated output.
Output
10V Maximum before overload, 2.5V rated 100 $\Omega$ output impedance (Typically 6.4V maximum into 600 $\Omega$). All outputs available in normal (non-inverted) and inverted modes. Also available is a mono output of the input signal as well as mono bass output.
Inputs
Two types per channel:
Transformerless bridging input with ¼" phone jack and attenuator, 20k ohm balanced, 10k ohm unbalanced OR Unity gain input ¼" phone jack, 1M ohm unbalanced.
Gain
0-15.5dB from balanced/unbalanced input.
Hum and Noise
Typically 113dB below rated output from shorted unity gain input, 20 Hz to 20kHz. Typically 107dB below rated output from 600 Ω balanced input, 20Hz to 20kHz. 97dB minimum below rated output at maximum gain, 20Hz to 20kHz with inputs unterminated. All tests with filters flat.
Distortion
IM distortion less than 0.01% at rated output (IHF or 600 Ω load) with filters flat or set at 20Hz and 20kHz.
Filters
Separate 18dB Butterworth Highpass and Lowpass Filters with adjustable corner frequencies. Can be internally cascaded to form band pass and band reject filters.
Semiconductor
8 integrated circuits and 16 diodes (24 operational amplifiers and 2 regulators equivalent to 387 transistors, 40 diodes, 14 zeners and 12 F.E.T'S).
Power Requirements
2 Watts 120 VAC or 240 VAC 50-400 Hz.
Fusing
For 120 VAC use 3 AG 1/8 Amp 250 VAC Fuse (For 240 VAC use AGC 1/16 Amp 250 VAC fuse)
Controls
Range and vernier controls for corner frequencies and power switch are on front panel. Screw driver adjustable input attenuators on rear panel.
Connectors
Inputs - 3 conductor ¼" phone jack balanced/unbalanced (variable gain input) - 2 conductor ¼" phone jack unbalanced (unity gain input). Outputs - 2 conductor ¼" phone jack
AC line - Three wire (grounded) male connector on 5 ft. minimum cable
Chassis Finish
All satinized aluminum front panel
19" standard rack mount (W.E. hole spacing), 3%" height, 5%" maximum depth (from mounting surface).
Weight
6 lbs
1718 West Mishawaka Road Elkhart, Indiana 46514 U.S.A. 219-294-5571 TWX 810-294-2160
Crown VFX-2A Filter/Crossover
The Crown VFX-2A filter/crossover, requiring 3½"(8.89cm) of vertical rack space, provides continuously variable, active, solid state filters which can be used to perform either crossover or bandpass functions. The dual channel unit employs two filters per channel, each continuously variable from 20Hz to 20K Hz. One filter forms the high pass section, the other, low pass. Filter roll-off is fixed at 18dB per octave, a rate that eliminates any noticeable dip in the frequency spectrum at crossover points when properly adjusted. The sharp roll-off also quickly attenuates unwanted frequencies above and below crossover.
Setting both high and low pass filters in one channel to a common frequency provides a two-way crossover at that frequency (see illustration). A variable gain (0 - 15(B) bridging input is provided for each channel along with an unbalanced inity gain input. Output impedance is 300 ohms in both inverted and non-inverted modes with over six volts maximum ouput into 600 ohms. Bridging the normal and inverted output results in a balanced output at twice the gain. This provides input and output impedance matching compatibility for both music and commercial sound systems. Overall noise and distortion are extremely low - among the lowest in the industry - with 1M distortion less than .01 percent at rated output, and noise more than 100dB below rated output with zero dB gain.
Cascading both channels together provides either a combined bandpass and two-way crossover, or a three-way crossover (triamping). The unit also has a mono jack which takes the two input signals (the two signals that are coming in the left and right channels) and combines them through a buffer stage to form a mono output. This mono output can be changed to a mono treble output, by soldering two jumper wires to appropriate terminals on the circuit board. As well, there is a mono bass output which takes the low pass section of both filters and combines them through a buffer stage which feeds the output jack.
The compact size of the unit (3½ inches high with a maximum depth of 5¼ inches from the mounting surface) makes the VFX-2A an unusually small but versatile piece of equipment that takes up little rack space relative to its value.
The VFX-2A features a satinized aluminum front panel matching that of other Crown products. An amber, front panel LED lights to indicate power.
The Crown VFX-2A is a quality professional component. The VFX-2A offers traditional Crown durability and a full 3 year warranty.
0
The electronic filter/crossover shall contain two channels of continuously variable, active, solid state filters which can be utilized to perform crossover and/or bandpass functions. The unit shall employ two Butterworth filters per channel, each filter being continuously variable from 20Hz to 20KHz. One filter shall form the high pass section while the other filter shall form the low pass section. Filter roll-off shall be fixed at 18dB per octave.
The unit shall operate from 120VAC at 50-400Hz, and shall consume 2 watts. The unit shall weigh 6 lbs. and measure 19" long (W.E. hole spacing) x 3½" high x5¼" deep.
The unit shall have a rated output of 2.5V and shall deliver a maximum output voltage of 10V before overload. At 2.5V rated output the unit shall have less than 0.01% IM distortion. With all filters flat, hum and noise shall be more than 100dB below rated output with 0dB gain, 20Hz to 20K Hz.
All outputs (¼* phone jacks) shall be available in both noninverted and inverted modes at 100 ohms output impedance (typical 6.4V max. into 600 ohms). In addition, a mono output of the input signal shall be available as well as a mono bass output.
Two types of inputs shall be provided for each channel: Transformerless bridging inputs (¼" phone jacks) shall be available, each having its own external gain control which shall provide gain from 0-15.5dB. Input impedance shall be 20K ohms balanced, and 10K ohms unbalanced. Additionally, a unity gain input shall be available at 1M ohms unbalanced.
The electronic filter/crossover shall be supported by a 3 year warranty honored by a nationwide network of authorized service centers. The electronic filter/crossover shall be a Crown VFX-2A.
ILLUSTRATED VFX-2A FUNCTION
OUTPUT SPECTRUM
General Specifications
| Frequency Response |
±0.1dB 20Hz to 20KHz with 1HF load.
Typically ±0.2dB 2Hz to 58KHz with 1HF load, ±0.5dB 18Hz to 38KHz with 600 ohm load. All tests with filters flat and at rated output. |
|---|---|
| Output |
10V maximum before overload, 2.5V
rated. 100 ohm output impedance typically 6.4V maximum into 600 ohm). All outputs available in normal (non- inverted) and inverted modes. Also available is a mono output of the input signal as well as mono bass output. |
| Inputs |
Two types per channel: Transformerless
bridging input with ¼" phone jack and attenuator, 20K ohm balanced, 10K ohm unbalanced OR unity gain input gain ¼" phone jack, 1M ohm unbal- anced. |
| Distortion | IM distortion less than 0.01% at rated output (IHF or 600 ohm load) with filters flat or set at 20Hz and 20KHz. |
| Semiconductor |
8 integrated circuits and 16 diodes (24
operational amplifiers and 2 regulators equivalent to 387 transistors, 40 diodes, 14 zeners and 12 FET's). |
| Power Requirements | 2 watts 120 VAC or 240 VAC 50-400 Hz. |
| Fusing | For 120 VAC use 3 AG ½ amp 250 VAC fuse (for 240 VAC use AGC 1/16 amp 250 VAC fuse). |
| Controls |
Range and vernier controls for corner
frequencies; and power switch are on front panel. Screw driver adjustable input attenuators on rear panel. |
| Filters |
Separate 18dB Butterworth Highpass
and Lowpass Filters with adjustable corner frequencies. Can be internally cascaded to form bandpass and band reject filters. |
| Gain | 0-15.5dB from balanced/unbalanced input. |
| Hum and Noise |
Typically 113dB below rated output
from shorted unity gain input, 20Hz to 20KHz. Typically 107dB below rated output from 600 ohm balanced input, 10Hz to 20KHz. 97dB minimum below rated output at maximum gain, 20Hz to 20KHz with inputs unterminated. All tests with filters flat. |
| Connectors |
Inputs - 3 conductor ¼" phone jack
balanced/unbalanced (variable gain input) - 2 conductor ¼" phone jack unbalanced (unity gain input) Outputs |
|
|
| Dimesions and Weight |
48.26cm (19 inches) standard rack
mount width (w.e. hole spacing) 8.89cm. (3.50 inches) high, 14.61cm (5.75 inches) deep from mounting surface; 2.72kg (6 pounds). |
| .1000 | · |
| , | < |
STEREO BIAMP PER CHANNEL
0011011
STEREO BIAMP PER CHANNEL
Loading...