Alctron HA 408

Shared monitoring for the studio, podcasting and rehearsals

Letting several people hear the same source should not complicate a session. The Alctron HA 408 centralizes signal distribution to multiple headphones while retaining separate level control for each of its four channels. It therefore meets the needs of small working groups who want to listen together without relying on a single headphone output.

In the studio, this stereo headphone amplifier allows several musicians to monitor the same audio program. In podcasting, it makes shared monitoring easier for guests. It also fits naturally into singing lessons, for monitoring an accompaniment or analyzing a take together, as well as rehearsals when headphone monitoring is preferable to playback through speakers.

Its capacity reaches 8 headphones across 4 channels. Volume controls are therefore independent per channel, rather than per headphone when two headphones share the same channel. This distinction allows connections to be organized according to the participants' monitoring preferences.

Versatile connections to simplify your setup

Three inputs combined automatically

The HA 408 features inputs in 3.5 mm jack, 6.35 mm jack and RCA formats. This variety makes it easy to integrate with audio equipment using different connectors. You can therefore choose the connection suited to your source without building your entire setup around a single format.

The three inputs are mixed automatically: connected signals can be combined for monitoring without adding a dedicated mixer for this task. This operation is particularly useful when several elements need to be heard together. To adjust their relative balance, plan to adjust the levels on the source devices using the controls available on them.

Four controls to adapt the monitoring level

Each channel has its own volume control. A participant can therefore request more level on their channel without imposing this change on the others. This is a practical advantage during group sessions, where the headphones used and monitoring preferences may not be identical.

The outputs are provided in 3.5 mm jack and 6.35 mm jack formats. The HA 408 supports headphones with an impedance ranging from 16 to 250 ohms, a range that allows it to be used with various models. Checking your headphones' impedance remains useful before preparing your setup.

A compact format to keep your workspace clear

With dimensions of 140 x 98 x 31 mm and a net weight of 408 g, the HA 408 takes up little space next to an audio interface or recording station. Its metal enclosure complements a design focused on one specific function: distributing stereo monitoring to multiple users.

Its rated power reaches 290 mW per channel at 100 ohms, with a maximum gain of 22 dB per channel. The signal-to-noise ratio of over 98 dB completes these specifications. Together, these features provide a dedicated solution for multichannel headphone distribution, without multiplying the number of devices required for a single session.

Technical specifications

Bluetooth	No	Outputs	stereo minijack headphone, jack
Connection	mini Jack 3.5, RCA, 6.35mm jack	Color	Grey
Impedance	5 Ω	Power output	290 W
Inputs	minijack, jack, Rca

Type	stereo headphone amplifier	Maximum gain	22 dB per channel
Number of channels	4 independent channels	Signal-to-noise ratio	greater than 98 dB
Connection capacity	up to 8 headphones	Output power	290 mW per channel into 100 ohms
Volume control	independent per channel	Compatible headphone impedance	16 to 250 ohms
Input mixing	automatic	Housing	metal
Input impedance	22 kilohms	Power supply	5 V / 2 A DC
Maximum input level	+22 dB	Dimensions (L x W x H)	140 x 98 x 31 mm
Output impedance	4.7 ohms	Net weight	408 g