No difference in output or frequency response was observed when one headphone was plugged in or when 3 headphones were plugged in at the same time. Signal to noise ratio was measured -95dBa from clipping level into a 33 ohm resistance. Distortion was measured just below the clipping level, at 0.3%, which is the residual distortion of the generator used.

The input impedance was found to be approximately 500 ohms. The output impedance was approximately 1 ohm. Maximum power transfers occur with an 8 ohm load.

Frequency Response:
The Boostaroo employs similar output amplifiers to those found in CD players. Frequency response is equal to or exceeds specifications. Typical specifications are 20 to 20,000Hz +/- 2 dB (EIAJ CP-307 Method).

Output (@ 3VDC):
Under 1% harmonic distortion.

1. Into 8 ohm headphones - approximately 40 mW per channel, 12 dB gain in sound per channel. Or 100% boost in loudness.
2. Into 16 ohm headphones (stereo mini jack), approximately 40 mW per channel, 12 dB gain in sound per channel.
3. Into 25 ohm headphones: approximately 40 mW per channel, 11.1 dB gain in sound per channel.
4. Into 32 ohm headphones: approximately 30 mW per channel, 10.9 dB gain in sound per channel.
5. Into 64 ohm headphones: approximately 13.8 mW per channel, 10 dB gain in sound per channel.

Power Requirements:
3.0 VDC: Two size AA batteries are required. Use of alkaline batteries is suggested for longer playing time. Also works with rechargeable batteries, nickel-metal hydride type preferred.

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