The HP4E 4-Channel Headphone Amplifier from AKG features two stereo input and four stereo output channels of high-quality audio. It can be used to add up to four headphones in applications for mixing, recording, and is designed with convenient switches on the front panel to enable you to select your desired input.

Headphones require no adapters. The front panel is built with both a 1/8" and a 1/4" headphone output and volume control for each channel. Housed in a sturdy chassis, the HP4E is an ideal headphone amplifier for any recording session.

2 x Stereo TRS Inputs    4-Channels, Each with Volume Control    1/8" & 1/4" Headphone Output Per Channel    Selector Switch for Each Output 1-2

Related Questions and Answers

Q: 1. Is it possible to operate it in mono using the XLR connection or only when using the 1/4" connection?

A: Thank you for your question. for mono operation you would need to use the right 1/4 inch input only.

Q: 2. I'll rephrase my earlier question: Does the "stereo/mono" button provide mono output?

A: Yes, when the MONO/STEREO switch is pressed in for the Rolls RA62C 6-Channel Headphone Amplifier, the right and left channels are summed together, providing a mono output signal.

Q: 3. Where can I find the mounting hardware for a rack?

A: thank you for your question. This unit does not have rack mount hardware available. I would suggest getting double sided hook and loop tape and attached to a single 1RU shelf such as the B&H # AURS1U

Q: 4. Will this unit drive a 250 ohm headphone with enough power to where I dont feel like I need a higher power amp?

A: This is a professional, studio- quality headphone amplifier that is compatible with low and high impedance headphones, and will have the power to handle 250 Ohm headphones.

Q: 5. Will this unit drive a 250 ohm or 600 ohm headphone player with plenty of power, to where I don't feel like I need a higher power amplifier?

A: The specs show power of 600mw with 32 ohm headphones. One must also consider: 1- the headphone sensitivity specification, which will tell you how loud a headphone is, based on the power applied. 2- the transients in whatever it is you are listening to; large transients requires much more power. see below article of explanation: https://www.audeze.com/blogs/technology-and-innovation/sensitivity-impedance-and-amplifier-power

Q: 6. 12 V, 500 mA is the requirement for the power adapter for the AKG HP4E according to the specs. Question: Is the tip positive or negative?

A: The manufacturer has not specified whether the power supply for the AKG HP4E 4-Channel Headphone Amplifier has a positive or negative tip, however, a dedicated power supply included with the HP4E.

Q: 7. Will this unit drive a 250 or 600 ohm headphone with plenty of power to where I don't feel like I need a higher power amplifier?

A: This headphone amplifier is designed to handle high impedance headphones, so it will have enough power for 250 or 600 Ohm headphones.

Q: 8. Will this Rolls RA53B shipped with 220V power adaptor?

A: The 12 VDC Power Supply included is designed to accept 120 VAC only.

Q: 9. Can multiple headphones listen to the same content?

A: That is literally the only thing this product does.

Q: 10. The description says "stereo/mono operation". Is this really true; if so how?

A: The Rolls RA62C has a stereo/mono button next to the "Main Input" knob on the front of the unit.