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This is a NO COMPROMISE design using the
best parts available wherever possible.
Some examples of this are as follows:
• Gold plated jack sockets for reliability and
long life.
• Full metal XLR sockets for strength and
their positive latching facility.
• Powerful output stages for extra
headroom (rated in English RMS real
power and not MUSIC or PEAK power as
these can claim to be 2 or 3 times the
actual real power of the amplifier).
• Doubling up of the cooling fans for
reliability and reduced fan noise (2 fans
can run at half the speed to provide the
same cooling capacity and as a
consequence generate only half the noise
of one fan running at twice the speed).
• Speed controlled fan drive circuit. Again
this reduces the amount of fan noise as
the fans run slow when the unit is cool
and increase in speed with output power
demands.
• Powerful TOROIDAL mains transformer.
This is more expensive than a laminated
stack transformer but has better
regulation, i.e., provides more power on
demand without sagging out and also
has a minimal external magnetic field
which means that single coil pick up
basses are less likely to pick up mains
hum from the amplifier.
• FET input circuit to the preamp for
‘Warmth’even when using the CLEAN
input mix setting.
• D.C. heaters for the TUBE section for low
noise operation.
• Switch on delay for silent power up.
• Thermal trip for output protection.
• Relay switched speaker output lines for
silent power down.
• Sub Bass output and Sub Harmonics
facility for really serious bottom end.
Everything possible has been done to make
this a reliable, top of the range, minimum
service, high quality, long lasting powerful
bass amplifier.
We know you will appreciate the effort that
has been put into the design and
manufacture of this unit and you will be
rewarded in your choice of bass amplifier by
long life and reliability.
ABM Design Philosophy
ABM/RPM-1
#17669 - Manual 2005_ABM 18/4/05 12:21 pm Page 5