Richmar Quattro 2.5 DQ8450 | 4-Channel TENS, EMS, IFC & Russian Stim

Richmar® Quattro™ 2.5 Professional 4-Channel Electrotherapy Device

The Richmar Quattro 2.5 is a professional four-channel electrical-stimulation system for physical therapy clinics, rehabilitation departments, chiropractic offices, sports-medicine practices, athletic-training rooms, and other clinician-directed treatment settings.

Five electrotherapy waveform families are built into one compact tabletop device:

• TENS

• EMS

• Russian stimulation

• IF-2P premodulated interferential

• IF-4P traditional interferential

The Quattro 2.5 also provides two programmable treatment groups, 50 preset programs, user-defined protocols, professional two-step programming, constant-current and constant-voltage operation, and a large graphical LCD display. This combination gives clinicians considerably more control than a basic portable TENS or two-channel combination stimulator. 

Sale by or on the order of a physician or licensed practitioner. It is intended for use under the continuing supervision of a qualified professional. 

For complete setup, parameter, safety, cleaning, error code, and troubleshooting information, read our Quattro 2.5 Manual Summary, Safety, and Specifications.

Product highlights

• Professional microprocessor-controlled electrotherapy system

• Four stimulation output channels

• Two independently programmable channel groups

• Individual output-intensity control for all four channels

• TENS, EMS, Russian, IF-2P, and IF-4P waveform families

• Synchronous and asynchronous EMS modes

• Synchronous and asynchronous Russian modes

• Two programmable treatment timers

• Ten presets per waveform family

• Fifty total presets

• User-defined protocol storage

• Professional mode with two treatment steps

• Constant-current and constant-voltage output choices

• Interferential vector and frequency-modulation controls

• Large graphical LCD display

• Physical knobs for direct channel-intensity adjustment

• Maximum treatment time of 60 minutes

• AC-powered tabletop and therapy-cart design

• Starter self-adhesive and reusable rubber electrodes

• Two-year manufacturer warranty

The device is suitable for tabletop, therapy cart, or mobile use, but the device requires its supplied AC power adapter rather than operating from an internal battery.

Quick product specifications

Understanding the four-channel design

The Quattro 2.5 has four output channels, but the programming is organized into two treatment groups.

This arrangement allows the clinician to run a different waveform, program, timer, and intensity configuration on Channels 1–2 than on Channels 3–4. This can support two treatment areas or two patients at the same time when clinically appropriate and properly supervised. 

It should not be marketed as four entirely separate programmable systems. The intensities are individually controlled, but waveform and timing selections are shared within each two-channel group.

Electrotherapy modes explained

Symptomatic relief of chronic intractable pain and acute post-traumatic or post-surgical pain for TENS and interferential modes. Its EMS and Russian indications include muscle-spasm relaxation, prevention of disuse atrophy, local circulation, muscle re-education, maintaining or increasing range of motion, and immediate postoperative lower-leg stimulation for prevention of venous thrombosis when appropriately ordered and supervised. 

For a broader explanation of sensory and muscle-stimulation modalities, read TENS vs. NMES: Differences, Uses, and Safety.

IF-2P vs. IF-4P interferential stimulation

The Quattro 2.5 allows a static beat frequency or frequency-modulated sweep. IF-4P additionally includes automatic vector control from 0% to 100% and manual vector adjustment from 0° to 90°.

Explore related products and education in our Interferential Therapy collection.

Technical waveform ranges

These are device capabilities, not recommended patient settings. Treatment parameters must be selected according to the prescription, clinical assessment, waveform, electrode size, placement, patient response, and complete device instructions.

Constant current vs. constant voltage

The Quattro 2.5 allows the clinician to select either CC or CV operation.

Neither mode is automatically superior for every treatment. The choice should be made by a trained clinician using the manual, electrode instructions, facility protocol, and patient-specific treatment plan.

What comes with the Quattro 2.5?

Richmar’s manual lists the following starter accessories:

Includes the Quattro 2.5 device, starter self-adhesive electrodes, rubber electrodes, sponges, elastic straps, lead wires, device connectors, power supply, and instruction manual. Accessory quantities and part numbers are subject to the current Richmar package configuration.

Electrode options and replacement supplies

The Quattro 2.5 can be used with compatible self-adhering electrodes or reusable rubber electrodes with properly prepared sponges or approved conductive gel.

Use self-adhesive electrodes with at least 25 cm² of active surface area and specifically recommends a minimum size of approximately 2" × 2". Electrodes should be fully adhered, separated from one another, and selected to fit the anatomy and planned current density. 

Added conductive gel is normally not needed with pre-gelled self-adhesive pads. Gel or properly moistened sponges are used with the reusable rubber-electrode system as directed in the manual.

Quattro 2.5 vs. other electrotherapy devices

Choose the Quattro 2.5 when:

• Four-channel clinical stimulation is needed.

• Both premodulated and traditional four-pole IFC are important.

• The clinic wants TENS, EMS, and Russian stimulation in the same system.

• Two treatment groups with separate timers are useful.

• Fifty presets and custom programming provide enough flexibility.

• Ultrasound is not required.

• A conventional clinical LCD-and-dial interface is preferred.

• The clinic wants a lower-cost option than a premium touchscreen system.

Appropriate professional settings

The device is not a general consumer home TENS unit. Its parameter range, output capability, professional programming, electrode requirements, and clinical warnings make clinician supervision essential.

Basic setup overview

This section should remain concise on the product page, with the complete procedure kept in the manual article.

1. Inspect the device, cables, lead wires, electrodes, and skin.

2. Connect the AC adapter and switch on the device.

3. Connect the lead wires through the appropriate Quattro cable connectors.

4. Place correctly sized electrodes on clean, dry, intact skin.

5. Select Channels 1–2 or Channels 3–4.

6. Select the waveform and preset or custom program.

7. Select constant-current or constant-voltage operation.

8. Adjust the waveform-specific treatment parameters.

9. Set the treatment time.

10. Increase each channel intensity gradually while monitoring the patient.

11. Reduce output to zero and stop the selected channel group before removing electrodes.

The device performs an initial self-test and includes load detection that can alarm and reset the intensity if adequate electrode contact is not detected. 

Important safety information

Frequently asked questions

What is the Richmar Quattro 2.5?

It is a professional four-channel electrotherapy system offering TENS, EMS, Russian, two-pole premodulated interferential, and four-pole traditional interferential stimulation.

Is the Quattro 2.5 a prescription device?

Yes. Its sale to or on the order of a physician or licensed practitioner. 

Does it have four independent channels?

It has four separately adjustable output intensities. Programming is organized into two independent groups: Channels 1–2 and Channels 3–4.

Can it run two different treatments at once?

Yes. The two channel groups can use different waveforms, programs, timers, and intensities. This can support two treatment areas or two patients when appropriately supervised. 

How many presets are included?

The device provides 10 presets for each of five waveform families, for a total of 50 presets, plus professional and user-defined programming. 

Does it have true four-pole interferential stimulation?

Yes. IF-4P uses four electrodes and a 4 kHz carrier. The device also includes IF-2P premodulated stimulation.

Does it include Russian stimulation?

Yes. It provides synchronous and asynchronous Russian modes using a 2.5 kHz carrier and an adjustable burst frequency from 2 to 100 Hz.

Does it provide NMES?

The device labels its muscle-stimulation waveform as EMS. Its motor-level indications and programmable contraction, relaxation, and ramp functions align with professional neuromuscular electrical-stimulation workflows.

Is it battery-powered?

No. It operates from the included 100–240 VAC power adapter. “Portable” refers to its ability to be carried or moved on a therapy cart, not cordless operation.

Does it include ultrasound?

No. Clinics needing electrical stimulation plus therapeutic ultrasound should compare the Richmar ComboCare.

What electrodes should be used?

Use compatible electrodes that satisfy the device manual’s size, connector, and current-density requirements. The manual recommends self-adhesive electrodes with at least 25 cm² of active area.

Can 1.25-inch or 1.5-inch pads be used?

They fall below the manual’s 25 cm² minimum active-area warning and should not be represented as standard replacement pads for this device. Use approximately 2-inch square or larger electrodes unless Richmar or an appropriately qualified clinician directs otherwise.

Can the included rubber electrodes be used without sponges?

The manual allows either properly moistened sponges or an approved conductive transmission gel. The electrodes must be secured using the appropriate straps.

Can pre-gelled adhesive pads be used with additional gel?

Normally no. Additional gel may interfere with their adhesion. Separate conductive media are primarily used with compatible non-gelled rubber or carbon electrodes.

What is professional mode?

Professional mode allows two programmed treatment steps within one session so selected parameters can change from the first step to the second. (Balego)

What is the maximum treatment time?

The timer can be set from 1 to 60 minutes.

What is the warranty?

A two-year warranty, subject to the warranty terms and exclusions. 

Additional Recommended Resources

• Quattro 2.5 Manual Summary, Setup and Safety

• TENS vs. NMES Guide

• Contact Balego