Do these provide 250 or 660 ohms of power for headphones?

Well, ohms don't measure power. Ohms are a measure of impedance. With that said, AKG bills the HP4E as providing 600 Ohms of output impedance. I use it with 600 Ohm AKG K240s (the old Austrian made ones) and it works great.

Can I connect it to tv?

Yes. However, you will need some sort of adapter/cable depending on what output your TV has. If your TV has a 1/8" stereo headphone output get a 1/8" to stereo 1/4" inch "Y" cable.

Can I run an instrument thru it?

I have to disagree with the other answers here. Absolutely, you can get stellar tone using this as an amplifier for your instrument - but with a few considerations / adjustments. I have plugged my Rickenbacker 4003 bass into the HP4E and obtained beautiful tone. This is due to this AKG's strong point - it's excellent stereo amplifiers - which are warm and clear - unparalleled actually in my experience for headphone amps. But since there is no EQ of any kind on the AKG, you would want to use an equalizer before plugging in. Even better, I used a Tech 21 Sansamp VT which gave me both excellent tone (since its EQ is designed for bass) and excellent impedance matching. It might be limiting for guitar, but again - this unit's strong point is its amplifiers - they're wonderful. And since it has 1/4 inch inputs, you can plug your instrument straight in and with good headphones you'll hear the quality.

Akg Hp4e 4 Ch Headphone Amplifier

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Description

🎛️ Amplify Your Audio Game — Because Your Studio Deserves the Best

INSTANT INPUT SWITCHING - Front panel toggle switches let you effortlessly select between two stereo inputs, streamlining your workflow during critical recording sessions.
PLUG PLAY VERSATILITY - Each channel features both 1/4" and 1/8" headphone outputs—no adapters needed, just seamless connectivity for any headphone style.
REFERENCE GRADE CLARITY - Top-shelf AKG components provide reliable, high-volume amplification without distortion, making it ideal for low-impedance headphones and critical listening.
RUGGED COMPACT DESIGN - Built into a durable metal half-rack 1RU chassis, this lightweight powerhouse fits perfectly into any professional or home studio setup.
POWER YOUR STUDIO LIKE A PRO - Four high-power stereo amplifiers deliver pristine sound to each headphone channel independently, ensuring flawless monitoring for every team member.

The AKG HP4E is a professional-grade 4-channel headphone amplifier featuring four independent high-power stereo amps, dual 1/4" and 1/8" outputs per channel, and two stereo inputs with front panel switches. Housed in a rugged metal half-rack chassis, it offers reliable, distortion-free amplification optimized for low-impedance headphones, making it a compact and versatile choice for recording studios and serious audiophiles.

Specifications

ASIN	B01MUUG22U
Best Sellers Rank	#215,968 in Electronics ( See Top 100 in Electronics ) #302 in Headphone Amps
Brand Name	AKG
Customer Reviews	4.5 4.5 out of 5 stars (32)
Global Trade Identification Number	00885038038825
Included Components	Power Supply, Quick Set Up Guide
Item Dimensions	8.9 x 8.55 x 3.45 inches
Item Weight	2.12 Pounds
Manufacturer	AKG
Material Type	metal
Model	HP4E
Number of Channels	4
Part Number	3450H00010
UPC	885038038825
Unit Count	1.00 Count
Warranty Description	2-Year Warranty

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