Phil Jones Bass M-500, Руководство пользователя, Страница: 15 / 25

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If you are playing 5 or more strings on your bass beware that the lowest notes can cause
great stress on your speakers if you do not have enough of them. Low frequencies only
propagate well from large surface areas, which is why upright acoustic basses are a lot
bigger then violins. The same goes for speakers: more cone area means better coupling of
low frequencies. So if you really want ground shaking lows from your B / E or even F#
strings, consider using a lot more speakers.
Setting up the Limiter
Although a limiter is not essential to bass amplification, it can be a useful tool in
smoothing out the character of your instrument or playing style. The M-500 limiter has a
preset compression ratio of 3 to 1. For each additional increase of 3dB above the set
threshold, the increase in level is actually 1dB. So dynamic range of your instrument is
reduced.
First set up the limiter by having the compression control (5) set fully clockwise. Now
switch on the limiter (4). Start playing and turn control (14) anti-clockwise. You will see
the red light start to come on and that is the indication that the limiter is now working. Set
this control to suit your taste.
The M-500 has an extremely powerful EQ system. Take great care when turning up the
master volume control (20). On the front panel there is a power level indicator (21). The
red light shows the maximum safe power of 500 watts delivered into about 3
Ω . Below is
a chart of recommended speakers that are suited to the M-500. The red light will come on
at these power levels indicated. This is not actually the full power that is available but the
true power that is being delivered to the speakers. It is possible that the red light will flash
on and off when you are playing, because this light sees the instantaneous peak power
faster than what you can hear. Above this level the amplifier will increase its harmonic
distortion. That still may be well below the distortion of your speakers. It is typical that
many bass speakers can produce more than 10% distortion, which can still be heard as
acceptable sound.