Ashdown ABM 900 Panduan Petunjuk Pengoperasian - Halaman 5
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The ABM Design Philosophy
This is a NO COMPROMISE design using the best parts available wherever possible.
Some examples of this are as follows:
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Gold plated jack sockets for reliability and long life.
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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).
•
All MOSFET output devices for reliability and superior bass power and quality.
•
Doubling up of the reservoir capacitors for the output stage providing double the available 'punch'
or instantaneous transient power (very important for bass).
•
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.