Alto HPA4 Headphone Amplifier

http://www.audiomidi.com/common/cfm/product.cfm?pid=4872

Specifications

Audio Input

* Main input Connectors: X R and 1/4" jack
* Type: HF filtered, servo balanced input
* Impedance: 40 kOhms balanced, 20 kOhms unbalanced
* Max.input level: +21 dBu balanced and unbalanced
* CMRR: typ.40 dB, >55 dB @ 1kHz
* Aux In and Direct In input Connectors: 1/4" TRS (tip=left, ring=right, sleeve=ground)
* Type: unbalanced
* Impedance: >15 kOhms unbalanced
* Max.input level: +21 dBu unbalanced
* CMRR: typ,40 dB, >55 dB @ 1 kHz

Audio Output

* Connectors: XLR and 1/4" jack
* Type: balanced /unbalanced
* Impedance: dependent on the input impedance
* Max. output level: +21 dBu balanced and unbalanced

System Specifications

* Frequency response: 10 z to 50kHz,+/-3dB
* Noise: >90dB, unweighted, 22 Hz to 22kHz (>95dB @ +4dBu)
* THD: 0.005% typ.@+4 dBu, 1kHz, Gain 1

Power Amplifier

* Max.output power: +21dBm
* Min.output impedance: 100Ohms

Function Controls

* Input level: variable
* Balanced per channel: mix between aux and main signal
* Output level per channel: variable
* Treble: +15/-15
* Bass: +15/-15

Function Switches

* Left mute: mutes the left signal of the respective channel
* Right mute: mutes the right signal of the respective channel
* Mode: switches channel to mono

Indicators

* Input level: 8-digit LED display: -18/-12/-6/0/+6/+12/ +18dBu/CLIP
* Output level: 8-digit LED display: -18/-12/-6/0/+6/+12/ +18dBu/CLIP

Physical

* Dimension: 483(W)x217(D)x44(H)mm(19" 8.54" 1.7")
* Net weight: 2.9kg(6.39lb)

Treena

I have the 6 channel version. Got it on ebay for about 100 bucks, and it's been fine for my tracking purposes. In this price range, it was pretty much either alto or behringer, and since the alto had two more channels for the same price and was not made by behringer, i decided to go with it and have been happy so far.

Be thankfull you made the right descision. The Alto is a lot quieter and is a little better built. Besides, people see the big "B" brand in your studio and run.......I would. The Alto is budget gear but you are not incorperating it into your signal chain so it's ok.

what output from pa do you plug into the headphone amp

thanks

samson /behringer/alto

which one