ATI Technologies P100S Panduan Pengoperasian dan Pemeliharaan - Halaman 3

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Another important consideration is the presence of high amplitude, subsonic

input signals which originate in record warp, eccentric center holes and seismic

pick up from small earthquake and dancing DJ's. These signals are strongest in

the neighborhood of the cartridge and tone arm resonant frequency, typically 6 to

10 Hz. In studio applications these signals can overload amplifiers, saturate

console transformers, overdrive limiters, and damages loudspeakers. The

preamp input stage is the optimum location for a subsonic filter. That filter should

ideally remain in the circuit at all times. However, previous attempts ay "Rumble

Filters" noticeably rolled off low frequency audio and had to be switched out most

of the time. Your P100S preamp incorporates an active, tow pole subsonic filter

bridged around the RIAA feedback equalizer. This filter follows the RIAA curve

within .5 dB down to approximately 28 Hz, rolls off only 6 dB at 20 Hz then

plunges quickly -30 dB at 7 Hz. Excellent subsonic rejection is thus attained

without loss of low frequency audio.

The high-end sound of many cartridges can be noticeably altered by adjusting

the resistive and capacitive loading. You may jumper program the cartridge

loading from 47 pf up to 294 pf and from 50 to 100K ohms.

INSTALLATION

MOUNTING

Your Encore preamp won't win any beauty contests and should be hidden away

under the turntable. Mount it vertically on the side wall of your turntable cabinet

with screws through the keyhole slots on either end of the preamp. Avoid strong

magnetic fields from the turntable motor and make sure your cartridge leads

reach the preamp before final mounting.

WIRING

Our insurance company insists on three wire grounded plugs. The third wire

ground can cause a ground loop with your studio ground. If you are very sure

that your studio ground will provide adequate protection to your personnel in

case of an AC line short to the chassis, a 3 to 2 AC line adapter can be used to

isolate the power line ground. E recommend that the adapter be removed and

the power line ground be reconnected prior to any service work requiring removal

of the studio ground from the preamp chassis.

The four inch, low inductance copper strap that you are, of course, using for your

studio ground is not going to fit over the #6 ground stud on the P100 chassis.

Run copper strap to within a few inches of the chassis and jump to the chassis

with shield braid. Connect the tone arm ground lead to the same stud.

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