alto headphone amp

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)






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