I'm interested in the answers to the following questions about the Squeezebox Radio stereo headphone socket:
1. What is the ideal headphone impedance in ohms?
2. What is the ideal headphone sensitivity in dB per mW for maximum perceived loudness?
3. Can the Radio output circuitry tolerate the left & right channels being connected together?
The background to these questions is as follows:
I often use the SB Radio for bedtime listening, when for practical reasons stereo headphones are unsuitable.
I happen to have the earpiece from a Stanton DJ Pro 300 single-side headphone available.
As delivered from the factory, this headphone already has the left & right stereo channels connected as standard, so that the earpiece is effectively connected between L+R and ground.
The driver in this earpiece is specified as 100 ohm impedance with a specified sensitivity of 100dB @ 0.2mW at 1kHz.
I have already briefly connected this earpiece to the SB Radio and, although it works well enough audio quality-wise, I have to turn up the Radio volume way up for easy bedtime listening, so that if I unplug the cable without first reducing the volume setting, the loudspeaker output nearly shatters my eardrums!
This implies that I should replace the earpiece driver with one that is more sensitive, i.e. more audio output per mW of signal.
If I ultimately have to do this, maybe I should install two earpiece drivers into the headphone, one for the left channel and one for the right channel, and remove the L-R short-circuit.
Any advice appreciated!
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2012-07-02, 09:55 #1
- Join Date
- Jun 2010
Squeezebox Radio stereo headphone socket