CAD Audio HA4 4-Channel Stereo Headphone Amplifier

(10 customer reviews)


  • Compact and durable design
  • Standard 1/4″ stereo input jack
  • Ideal for recording and live monitoring applications
  • RoHS Compliant
SKU: B005O656B8 Category:


The HA4 is a compact stereo headphone amplifierfeaturing four discrete channels with individualvolume controls. Includes power supply and RCA female to 1 / 4 â �TRS adaptor.

From the manufacturer

CAD Audio

2016. ..our 85th year of excellence!

CAD Audio continues to build on over 85 years of innovation and success in the audio industry by delivering innovative and highly useful solutions for performers, engineers and a wide range of audio professionals. CAD Audio has emerged as a multifaceted company with a variety of the sub brands that extend to market segments such as Recording, Broadcast, Live Performance and Production, Commercial and Consumer Electronics.

CAD Professional Microphones (1988), initially formed in 1931 as the Pro Audio division of Astatic, now designs and manufactures microphones for the recording and live sound markets. CAD Audio is a leader in innovative and cost-effective high performance studio and live microphones.

CAD Audio HA4 4-Channel Stereo Headphone Amplifier

The HA4 is a compact stereo 4-channel headphone amplifier. This rock-solid amplifier features four discrete channels with individual volume controls. The HA4 has exceptional signal-to-noise ratio to provide the listener with amazing clarity. This product is an essential tool for enhanced listening performance and a vital accessory for the recording musician. Its small size makes it easy to transport to the studio.

High-Quality Audio in a Compact Package

The HA4 Compact 4-Channel Stereo Headphone Amplifier from CAD provides high-quality audio in a compact and durable package. The enclosure offers a 1/4 inch stereo input, and 4 individual 1/4 inch stereo headphone jacks. Each of the 4 output channels has its own volume control, so listeners can set their preferred loudness without affecting others.

4-Stereo Outputs with Individual Level Controls

Ideal for recording and live monitoring applications.

Compact and durable design.

Standard 1/4 inch stereo input jack.

4 stereo 1/4 inch outputs with individual level controls.

LED power indicator.

The unit operates on 12VDC power via the included adapter.

A Vital Accessory for the Recording Musician

Number of Channels 4.

Inputs 1 x 1/4 inch stereo input.

1 x DC power input.

Outputs 4 x 1/4 inch stereo headphone jacks.

Frequency Response 20Hz – 50kHz.

Signal to Noise Ratio > 110dBA.

Input Level +16dBu.

Output Impedance 47 ohms.

Output Power 50mW.

Controls 4 x Volume knobs.

Indicators 1 x Power LED.

Power 12VDC, 200mA.

Compliance RoHS.

CAD Audio – The Brand Used by Professionals

Additional information

Weight 10.9 kg
Dimensions 6 × 3 × 3 cm
Item Weight

10.9 ounces

Product Dimensions

6 x 3 x 3 inches

Domestic Shipping

Item can be shipped within U.S.

International Shipping

This item can be shipped to select countries outside of the U.S. Learn More

Country of Origin




Item model number


Date First Available

September 1, 2011

Connector Type

3.5 mm

Output Wattage

50 Watts


CAD Audio

10 reviews for CAD Audio HA4 4-Channel Stereo Headphone Amplifier

  1. John from Pgh

    CAD Audio HA4 ReviewI bought the CAD headphone amp for use with an M Audio 610, iMac and Pro Tools 9. I’ve found the 610 has sufficient volume when I’m recording solo, but when my neighbor comes over to lay down keyboard tracks, the 610 isn’t loud enough to hear the song while talking to relate chord/bridge changes. Also, the 610 routes the 2nd headphone out through main outs 3 and 4 instead of main outs 1 and 2, so another annoyance when two people need to monitor (originally tried a headphone splitter on the 1st headphone jack on the 610).I chose the CAD model since it’s made of steel, has the 4 headphone jacks in the front of the unit, and because I own a CAD Trion 7000 mic, and used to own CAD Equitek 100 and 300 mics. I read reviews from other headphone amps, so thanks to those folks who provided good insight. The HA4 didn’t have any reviews at the time I bought it, so just wanted to relate experience.I wasn’t seeking any type of higher fidelity than the 610 provides, just to add a little bit of volume for when two or more people are recording and conversing, which the CAD does nicely. It has plenty of volume if that’s what you need or want.

  2. shrap

    Works as expected.I got this to replace the Monoprice version that cuts out when high-impedance headphones are connected. It works great. I use it for demonstrating video games. It gets loud enough for anything I’d want to do. Sound quality is great at low and moderate levels. I don’t use it at high levels so I can’t comment on that.The power cord’s a little short (under 6′?) and it’s got a wall transformer on the end. Since it draws so little power, it would work better for me if it could be powered via USB. That’s probably not how most people use it, though.The audio input is on the front. I’d prefer it on the back, but that’s a small concern.

  3. Good shoe – bad shoe size

    I now can only use 1 channel so the box it now useless after about a yearI route the audio from my computer to this box so multiple people can hear audio at varying levels. Within the 1st month one of the channels blew out. about 4 months later channel 1 and 3 were gone. About a year later, channel 2 has a different level of volume on the left channel than the right. I now can only use 1 channel so the box it now useless after about a year. So if you only need a few months to a year’s use out of the box, it’s fine; however, if you are doing any type of quality sound I would pass on this one…

  4. Bronson VanWagoner

    Get It!Bought this to upgrade from the Behringer headphone amp and it is SUBSTANTIALLY better. Not distorted like the behringer when volume is high. Love it. Built really well too.

  5. Ron

    Great headphone ampGreat headphone amp! The tone and volume range are excellent. I had a cheap Behringer unit that didn’t work out of the box, so I upped the ante and went with this one. I’m very glad I did.

  6. truthseeker 10009

    solid little box- the real test with a headphone amp …solid little box- the real test with a headphone amp is how long the jacks hold up and i won’t know that for a while- so far so good

  7. Leon

    CAD Audio HA4 4-Channel Stereo Headphone PreampDoes a great job on a budget!

  8. Bluesman 54

    Is sounds great and infaced easily with me existing gearI needed this for my project studio. Someone is always stopping by to record.. This 4 channel headphone amp is a must have. Is sounds great and interfaced easily with me existing gear. LOVE IT!!!!!

  9. Cubby

    What good is an amp without fidelityWhile using the same headset and switching from my stereo to the headphone amp the difference was dramatic! Tinny, thin, and lacking bass. What good is an amp without fidelity?

  10. D. R.

    Excellent sound for those late night parent moviesExcellent sound for late night parent movies.Sound is magnitudes better than using a simple Y splitter.Before buying check if your TV has RCA audio outputs.

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