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Headphone distribution amplifier, Looking for suggestions
doomsweek
post Oct 18 2012, 11:05
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Hello, I want to power two headphones at the same time, an HD600 and an HD650. Currently I'm looking at the Behringer AMP800 and the PreSonus HP4. One of the problems I have with them is that they both have very big output impedances (47ohms and 51ohms, respectively).

Is it possible for the O2 to serve them both at the same time using a headphone splitter? But I think the HD650 would be louder than the HD600 for the same level. How do you guys propose I solve this?

You could also suggest different products. Budget is ~150USD. I want something that could power two headphones, has inaudible noise, has an output impedance of < 2ohm, and adds no coloration to the sound and has separate volume control for each headphone output.

Thank you and good day.

This post has been edited by doomsweek: Oct 18 2012, 11:20
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arward72
post Dec 10 2012, 20:44
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I use a Behringer HA4700 headphone amplifier sandwiched between Beyerdynamic DT 770 Pro 250 Ohm headphones and an ASUS Xonar DX soundcard.
These hardware components receive 16bit - 44100KHz .wav files which i created using ExactAudioCopy via Foobar2000 and the ASUS Xonar DXs ASIO driver.
This hardware / software / input signal configuration has kept me very satisfied for over a year now and i do not believe it is possible to improve apon it without
totally annihilating the law of diminishing returns.

http://www.behringer.com/EN/Products/HA4700.aspx

http://www.behringer.com/EN/Products/HA8000.aspx


The Behringer HA4700 has four independent amplifiers for connecting headphones while the Behringer HA8000 has eight.
The HA4700 has both tone and balance controls whereas the HA8000 has neither.
The HA4700 MAIN IN and MAIN OUT connectors come as balanced 1/4" TRS and XLR.
The HA8000 features 1/4" TRS connecters for both MAIN INPUTs.


HA4700 Specs

Price
$149 AU
MAIN IN
HF-filtered, servo-balanced XLR- and 1/4" TRS connectors
Input impedance
40 kΩ balanced,
30 kΩ unbalanced
Max. input level
16 dBu balanced and unbalanced
CMRR
typically 40 dB, >55 dB @ 1 kHz
AUX IN
1/4" TRS connector (stereo)
Input impedance
5 kΩ
Max. input level
+22 dBu
DIRECT IN
1/4" TRS connector (stereo)
Input impedance
15 kΩ 
MAIN OUT
XLR- and 1/4" TRS connectors, balanced
PHONES OUTPUT
1/4" TRS connector (stereo)
Max. output power
+24 dBm (load impedance 100 Ω)
+21 dBm (load impedance 8 Ω)
Min. output load impedance 8 Ω
Frequency response
10 Hz to 150 kHz, +/-3 dB
Noise
22 Hz to 22 kHz >90 dB @ 0 dBu
Dynamic range
22 Hz to 22 kHz: 110 dB
Distortion (THD)
0.006 % typ. @ +4 dBu, 1 kHz, Gain 1


HA8000 Specs

Price
$178 AU
MAIN IN
HF-filtered, servo-balanced 1/4" TRS connectors
Input impedance
40 kΩ balanced,
20 kΩ unbalanced
Max. input level
16 dBu balanced and unbalanced
CMRR
typically 40 dB, >55 dB @ 1 kHz
AUX IN
1/4" TRS connector (stereo)
DIRECT IN
1/4" TRS connector (stereo)
Input impedance
15 kΩ 
PHONES OUTPUT
1/4" TRS connector (stereo)
Max. output power
+24 dBm (load impedance 100 Ω)
Min. output load impedance
100 Ω
Frequency response
10 Hz to 150 kHz, +/-3 dB
Noise
22 Hz to 22 kHz >90 dB @ 0 dBu
Dynamic range
22 Hz to 22 kHz: 110 dB
Distortion (THD)
0.006 % typ. @ +4 dBu, 1 kHz, Gain 1
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