Can four people listen at different volumes?

Yes. Each of the four outputs has its own volume knob, so everyone sets their own level from the same source.

Does it work with 6.35mm studio headphones?

Only with an adapter. The input and all outputs are 3.5mm jacks, so 6.35mm headphones need a 3.5mm-to-6.35mm adapter.

Will it drive high-impedance headphones?

Not well. Output is modest, so it suits earbuds and low-impedance headphones better than 250-ohm or 600-ohm models.

What comes in the box?

The PH04 amplifier, a 12V 1.5A power adapter and a user manual.

How does it compare with a rack headphone amp?

It is much smaller and uses 3.5mm jacks, while rack amps like the Behringer HA400 offer 6.35mm jacks and more power in a larger box.

Can I use it to share a TV with several people?

Yes. Feed the TV's headphone or line output into the input and plug up to four sets of earbuds or headphones into the outputs.

What do buyers say about the Fosi Audio PH04 4 Channel Headphone Amplifier?

Rated 5 out of 5 from 4 ratings. Buyers like: Works well with a Brennan B2 for headphone use; Delivered promising results and good quality.

Where can I buy the Fosi Audio PH04 4 Channel Headphone Amplifier?

8 stores we checked sell it, including Fosi Audio, Suncoast Audio Direct, buynbuy store, cloudshiftsol, routeshop shop.

Fosi Audio PH04 4 Channel Headphone Amplifier Price History: $29.99

Q: Where is the Fosi Audio PH04 4 Channel Headphone Amplifier cheapest?

At Suncoast Audio Direct, for $29.99, 42% under what the other stores charge, as of our latest check.

What reviewers say

Owners who wrote about the PH04 describe it working well and delivering good quality, including with a Brennan B2 as the source. Feedback is limited, but the tone is positive.

What people mention

Sound qualityPraisedOwners say it delivers good, clean stereo sound.
CompatibilityPraisedIt works well with sources like the Brennan B2 and with 3.5mm headphones.
BuildPraisedThe compact metal case is described as tidy and portable.
Long-term useMixedFew owners report on durability over time.

From Fosi Audio

4 independent stereo high-power amplifier sections with separate volume knobs for each of up to four outputs
Lets up to four people monitor the mix for tracking, live uses, or listen to the TV with earbuds while working out
Ultra-compact and portable design suited to studio or stage where multiple headphones are used at once
3.5mm (not 6.35mm) input/output, so no 6.35 to 3.5mm adapter is needed
Power switch to turn the amplifier on/off anytime
Ultra low noise headphone amplifier

Guarantee: 24 months warranty; 18 months warranty stated for the headphone amplifier in the product details
Returns: 30-day money-back guarantee; full refund available via return in 30 days
Shipping: Free worldwide shipping, except certain regions such as Ukraine and Russia; free shipping in 3-7 days
In the box: Fosi Audio PH04 x 1, 12V 1.5A Power Adapter, User's Manual

About the Fosi Audio PH04 4 Channel Headphone Amplifier

Share a Single Stereo Source: 4 channel amplifier features 4 independent stereo high-power amplifier sections with separate volume knobs for each of up to four outputs, which makes it possible for up to four people to monitor the mix for tracking, live uses and listen to the TV with earbuds while working out.

For Studio and Stage Applications or more: Such an ultra-compact and portable design makes it very suitable for the studio or stage where multiple headphones are used at the same time.

Fantastic Stereo Quality: It is a mini headphone amplifier with 3.5mm (not 6.35mm)input/output that contributes to the smoother connection of output and input, suitable for virtually all types of headphones, creating the highest Stereo audio Quality and eliminating the need for a 6.35 to 3.5mm adapter to connect the headphone power amplifier to the headphone.

Unique Compact design with switch: It is convenient for you to turn on/off the compact headphone power amplifier with a power switch anytime and anywhere, saving energy when enjoying high stereo audio quality.

What You G: Ultra low noise headphone amplifier*1,12V DC power adapter *1, Use manul*1, 18 Months Warranty for Fosi Audio Headphone amplifier. Please contact us at any time if you have any problems.

Specifications

Details

Model

PH04

Input Mode

1/8'' headphone, stereo

Output Mode

1/8'' headphone, stereo

Input Impedance

100 Ω

Output Impedance

80 Ω