Logo - White Instruments

Celebrating our 54th Year

PARAMEDICs 22-P, 24-P & 26-P
and Transformer Equipped Models
Time Warp Equipped Models
Please note that only ParaMedics 26 and 48 are in production.



100% Matrixable - 100 Parametric Filters - Direct RS232 Control - Logic In and Out

Network Multiple Units on the Control Bus - Ultimate Price/Performance Ratio



Advanced Technology Digital Processor
with Parametric Equalizer / Crossover / Delay / Limiting

 The best just got better!

One or Two Channel
Two, Four or Six Outputs

All Digital EQ Filters, Delay, Limiting and Crossover

>111dB Dynamic Range

24 Bit AD/DA Converters

Secure. No Front Panel Controls. Password Protection.

Latest Generation DSP Engine

Servo-Balanced Inputs and Outputs

Optional Factory Installed Input and/or Output Transformers

Choose Phoenix (type) or XLR Connector Models at the Same Price

3 Year Limited Warranty

The New PARAMEDICs 22, 24 and 26 have no front panel controls for economy and security. All setup and operating functions are conducted from a PC running Windows 95/98/NT4 and White Windows 2 software. The computer/DSP link is generic RS-232 requiring only an industry standard cable. No outboard interface boxes are required. The RS-232 protocol and non-volatile EEPROM are new and more efficient. Transfers between the PC and ParaMedics as well as memory I/O are 50% faster. A convenient data connector is placed on the front panel and paralleled to the rear panel. Up to 250 PARAMEDICs can be daisy-chained (in any mix of models) and controlled from one PC.

Improved Input and Output Circuits and Control: The servo-balanced analog inputs and outputs are hand trimmed at the factory for matching levels. They can be operated unbalanced without a change in gain. All outputs are equipped with precision machine-wound inductors in an L-C circuit to absorb digital noise. Analog input and digital output levels can be individually adjusted in 0.5dB steps. The inputs can be linked together and selected outputs can be grouped. Linked or grouped levels are adjusted together and any offsets are maintained. The standard PARAMEDICs 22,24 and 26 are equipped with detachable Phoenix type audio connectors. XLR equipped models are available at no additional cost. Either model may be factory equipped with a set of fully balanced input transformers, output transformers, or both.

Output Levels: Individual outputs can be muted and have their polarity reversed. The 4 or 6 output levels can be assigned in up to three groups with a Master Level to control all. The Master level may also be muted.

Labeling: Name labels can be applied to all inputs, outputs, crossover sections and memories. These user assigned custom names will be displayed throughout the setup process.

Advanced Technology DSP Engine: A powerful Analog Devices' SHARC DSP with 32/40 bit floating point math delivers the raw computing power necessary to implement a complete multi-function audio processor. New discrete, 24 bit AD/DA converters sample the data at 48kHz assuring a wide dynamic range. The firmware can be updated in the field via the PC by re-flashing the unit with files downloaded from our web site.



The Filters: White Instruments has manufactured filters of all kinds for over forty-five years from a book of transfer functions that was closed in the mid 1930's. Our reputation for manufacturing audio filters that sound good and industrial filters that work is no accident. The secret is having the experience to select the appropriate transfer function and circuit topology for the task, then rendering the filter with a great deal of attention to craftsmanship and detail. This tradition is carried to our digital implementations.

The 100 available EQ filters include parametric, high-pass, low-pass, high shelving, low shelving, all-pass and symmetrical, boost/cut octave band, two-thirds octave, one-third octave and one-sixth octave. Any filter type can be placed on any of the unit's inputs and outputs. Single filters or multiple, selected filters may be copied, moved, bypassed and deleted. All filters can be adjusted on-line so that the change can be heard (and measured) in real-time. A new inverse button delivers the reciprocal of any setting, e.g. +3dB to -3dB.

A unique, time saving software feature allows the simultaneous creation of duplicate filters and their adjustment on all linked inputs and outputs. Change any parameter of one linked filter and the others will change accordingly.

Parametric: The Q of the parametric filters can be adjusted between 1/70 and 4 octaves. They are asymmetrical— engineered to be wider in boost mode and not as peaky sounding. Their center frequencies are adjusted in 1Hz steps between 20Hz and 20kHz. Amplitude is adjusted between -70 and +12dB in 0.1dB steps. Use the high-Q parametric filters to surgically remove feedback and room ringing. There are enough of them to do a thorough narrow-band tuning job.

H-P/L-P/A-P: Bandlimit your entire system or individual crossover sections (outputs) with the high-pass and low-pass filters that can have responses from 6 to 48dB/octave in 6dB steps. Their -3dB frequency is set between 20Hz and 20kHz in 1Hz steps. All-pass filters can have single or double pole characteristics and be fixed between 20Hz and 20kHz.

Shelving: Subjectively shape your program with the 6dB/octave high and low shelving filters. Their -3dB frequency can be set between 20Hz and 20kHz in 1Hz steps and their amplitude between -12dB and +12dB in 0.1dB steps. Shelving filters can also be used for CD horn correction.

Graphic Equalizer Filters: These are the symmetrical, smoothly summing, octave band and fractional octave filters that built White Instruments’ graphic equalizer reputation. They are generated from data included in the software. One filter, a group, or an entire set, can be placed on any input or output. Their frequencies are fixed on standard I.S.O. centers between 20Hz and 20kHz, and their amplitudes are adjusted between -12dB and +12dB in 0.1dB steps.


Crossover filter sections can be created on any or all outputs, and in any order. The ParaMedic 24, for example, can support one 4-way, or two 2-way, or one 3-way plus a bandlimited full range output. Individual crossover sections may be bandlimited by deploying a H-P and a L-P filter or be a simple H-P or L-P response. Their characteristics can be Butterworth, Bessel or Linkwitz-Riley and may be asymmetrical and/or mixed. Butterworth and Bessel responses may be set at 6, 12, 18, 24 and 48dB/octave. Linkwitz-Riley response steps are 12, 24 and 48dB/octave. The -3dB frequencies of any section are set between 20Hz and 20kHz in 1Hz steps.


CD horn correction is applied to any output by adding a high shelving filter. The cumulative effect of the channel’s EQ filters and crossover section can be viewed while adjusting the new shelving filter.

White Windows 2 software is like using a precision machine tool for crossover setup. Pressing the Network Sum button will display the combined crossover response including any phase issues at crossover. Plus the new ParaMedics have the ability to store your favorite crossover setups as macros (files) for recall later.

Delay has been increased to 4.5 seconds (770ms for the ParaMedic 22) that can be arbitrarily distributed to any and all inputs and outputs by simply adjusting it in 1ms or 0.021ms steps. 

Use delay on the inputs to move your cluster, use the output delays to time align your loudspeakers in as small as ” increments.


Limiting: A digital hard or soft knee limiter with adjustable threshold and release times can be added to any and all outputs. The firmware allows linking any two or more output limiters.


Multi-band Limiting: Many upscale, stand alone limiters offer multi-band limiting. That is, the program is divided into several bandpass sections for the purpose of limiting. The limiter works only on the section that approaches threshold and the other sections are left untouched.


To help maintain imaging in stereo, multi-way systems limiters can now be assigned in up to three linked groups. Example: On a PARAMEDIC26 the two low sections, the two mid sections and the two high sections can be linked in a multi-band limiting application.
In a mono application bandlimited crossover sections and limiters are used on the outputs and the linking feature is left off. The limiting function will be multi-band or selective only to the crossover section that approaches threshold.

Logic Inputs & Logic Outputs: The new ParaMedics incorporate an industry first logic input so that it can receive 5V signals to change its 15 memories or 31 presets. The signal received may even be from a logic output of a different branded product (e.g. automatic mic mixer, matrix mixer, etc.). White Instruments beats AES24 to the punch to become the first product to offer true interspecies compatibility. 

The logic input can also incorporate a simple contact closure switch for up to 5 preset selections. Each of the 31 logic input conditions can trigger one of the unit’s 31 logic output signals to trigger relays, light LEDs, etc., or start a chain of events in an external controller.


RS-232 Remote Control: All ParaMedics can have several basic functions like input and output level changes, mute and memory and preset recall remote controlled through their RS-232 interfaces by an external controller that can be programmed to send White Instruments’ protocol through an industry standard communications port.


The Unit Summary Screen provides a quick overview to the major settings as well as instant access to all setup screens.


A Pink Noise Generator is built-into all three new models for sound system testing. When invoked, both analog inputs are disconnected from the unit and the pink noise inserted in their place. The noise level is adjustable in 1dB or 0.1dB steps over a range of -80dB to 0dB and can be switched on and off for each output making system checkout a snap!

Time Warp: The ParaMedics 22, 24 and 26 may be optionally equipped with a 7-Day real time clock called Time-Warp. Up to 70 events that recall storage memories and/or trigger logic events can be programmed. Time-Warp is Y2K compliant, leap-year aware and can automatically adjust for daylight savings time.

The Mixer is fully matrixable. Any input (with its associated filters) can be assigned to any or all outputs.



PARAMEDIC 24-P Rear Panel


PARAMEDICs 22, 24 & 26

Safety Certifications:

UL, cUL, CE.

Number of Channels:

One or Two.

Memories and Presets:

15 memories and 31 presets, non-volatile. No battery required.
99 yr. expected life.

Input Specifications:

Number of Inputs:
Maximum Input Level:
Servo-balanced (unbalance without gain change).
60,000 ohms, balanced.
30,000 ohms, unbalanced.
Factory installed transformers. Optional transformers do not effect impedance.

Output Specifications:

Number of Outputs:
6 (
Maximum Output Level:
Servo-balanced (unbalance without gain change).
102 ohms, balanced.
51 ohms, unbalanced.
Factory installed transformers. Optional transformers do not effect impedance.
Transformers reduce input power from 20Hz to 100Hz.
Insertion loss ~1dB.

Maximum Operating Level:

+22dBu into 600 ohms.

Dynamic Range:


Frequency Response:

20Hz - 20kHz, 0.5dB.

Digital Filters:

100 parametric filters or 80 non-parametric filters.
Parametric, High-Pass, Low-Pass, All-Pass and Shelving,
Symetrical Graphic EQ - Octave, 1/6, 1/3 & 2/3.
Minimum Spacing:
All filters, 1Hz.
Frequency Range:
All filters, 20Hz - 20kHz.
Amplitude Range:
Parametric: -70dB to +12dB.
Symetrical: -12dB to +12dB.
H-P, L-P: 6 - 48dB/oct., 6dB steps.
A-P: Single or two-pole response.
Shelving: 6dB/octave response. 12dB amplitude.
Parametric Q Range:
Q=0.1 to Q=100 in 0.1 steps.

DSP Processor and Data Converters:

Analog Devices SHARC DSP with 32/40 bit floating point math. 24 bit discrete AD/DA, 48kHz conversion rate.

Front Panel Controls:


Computer Interface:

RS-232 port capable of communicating at 38,400 baud.

User Interface:

Setup/Operation:  PC running White Windows 2 (software included).

Preset Select:

5V Logic or Dry contact closure.


Firmware field reflashable.

Front Panel LED Displays:

Unit Power On:
Output Level/Clip Indicator (each output):
Tri-state LED.
Clip = Red.
6dB Below Clip = Amber.
Signal Present to 6dB Below Clip = Green
Output Limit Indicator (each output):
Limit = Red.
Input Indicators (each input):
Signal Present = Green.
6dB Below Clip = Amber.
Clip = Red.

Chaining Interface:

RS-232 repeater via RJ-11 cable (up to 250 units).

Logic Interface:

Two screw terminal blocks, each having 6 terminals   (detatchable Phoenix type).


4.5 seconds arbitrarily distributed in 1mS or 0.021mS steps among the inputs and outputs.

Minimum Input to Output Delay:



Hard or Soft Knee. Slow-Medium-Fast release. Adjustable Threshold. Ability to link output channels.


Butterworth or Bessel or Linkwitz-Riley.
6 to 48dB per octave response in 6dB steps.
Frequency adjustable in 1Hz steps.
Crossover sections can be grouped on the outputs.


3 Screw terminals, (detatchable Phoenix type). XLR option, rear
DB-9, front panel. Interface paralleled to RJ-11connector on rear        panel.
RJ-11, rear panel.
6 Screw terminals, (detatchable Phoenix type), rear panel.


94 - 132 or 190 - 260 VAC, 50/60Hz, switchable.
Detachable power cord with IEC connector.

Operating Temperature:

0 - 70 degrees C, non-precipitating humidity.

Pink Noise Source:

Digital,  1dB 20Hz - 20kHz.

Dimensions & Weight:

19" x 3.5" (2 RU) x 10.1", 7 lbs. (11 lbs. shipping).
48.26 cm x 8.9 cm x 25.65 cm, (4.1 kg shipping).
Add 4 lbs. (~1.8 kg) for transformer equipped models.


Uniform Limited Warranty:
Your White Instruments signal processor is warranted against defects in manufacturing, workmanship and original components for a period of three years from the date of original purchase. During this period White Instruments will repair or replace the unit (at our option) at no charge. White Instruments is the only Authorized warranty repair facility in the United States. Outside the U.S., White Instruments' Distributors are authorized to make Warranty Repairs.

Ordering Information:

Phoenix type audio connectors:
Base Model
XLR  audio connectors:
Optional transformers must be factory installed:
PM2-I/T Input transformers (2).
PM2-O/T 2 ParaMedic 22 Output transformers.
PM4-O/T 4 ParaMedic 24 Output transformers.
PM6-O/T 6 ParaMedic 26 Output Transformers.
Other Options:
Real time clock for triggering presets.

Please Note: White Instruments reserves the right to improve our products and to change features and specifications without notice. Such changes, however will always equal or exceed the previous design specifications unless otherwise noted.

Full function copies of White Windows 2 software are available at no charge by mail or can be downloaded from our web site: http://www.whiteinstruments.com/software.htm

Virtual PARAMEDICs and data files, requiring no actual units, can be created for evaluation, training, documentation and advance setup purposes.


White Instruments Div. C Van R, Inc.
- P.O. Box 90003 Austin, TX 78709 U.S.A.
Phone: 512-389-5358  Fax: 512-301-3932
Email: sales@whiteinstruments.com
webmaster: Emory Straus - eestraus@mymediastaff.com