Phil Jones Bass DOUBLE FOUR Owner's Manual page 6

5. Bass Control
This is centered on the fundamental frequencies of 4 and 5 string basses.
Boosting or cutting this will have significant effect on the weight of the tone.
6. Mid Range Control
This gives the "voice" of your instrument. Generally you will find that cutting
this control instead of boosting will have more of a truer bass sound. Boosting
may be useful for soloing or special effects.
7. Treble Control
This gives the instrument the definition to the sound. Boosting it for "slap"
bass or cutting back for "Reggae" bass sound.
If you boost excessively you may get more noise as hiss and that could be due
to the noise coming from the pre amp in your bass or a poorly shielded
instrument cable. PJB has a dedicated bass instrument cable (Model BI-12)
that is totally noise free and actually will improve the tone of your
instrument.
8. Master Volume
This controls the volume of both instrument and auxiliary input.
9. Auxiliary Input Jack
This is a stereo mini jack and can accept any signal from iPod, iPad, computer
or drum machine.
10. Auxiliary Input Level
Adjust this to balance you backing track to your bass level.
11. Line Output Jack
The pre amp in the DOUBLE FOUR is recording studio quality so the line out is
a very pure signal for recording or driving another amplifier.
12. Headphone Jack
You can use any kind of stereo headphones on this jack but remember you will
only sound good in your headphones if they are high quality. Don't try using
those cheap ones you get with a phone, you will be disappointed. We
recommend the best you can afford and PJB have designed a high quality
headphone (model H850) that can handle bass guitar (many can not!) and
they sound great on music too.
13. Power Switch
This switches off the amplifier from the DC supply but AC signal will still be in
the external supply. We advise that you disconnect the power supply from AC
source if you do not intend to use the DOUBLE FOUR for long periods of time.
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