Manley ENHANCED PULTEC EQP1-A EQUALIZER - Manual (Page 5)

FRONT PANEL
IN
BYPASS
A B C D E F G H I J K
HIGH FREQ. CUT
SECTION
LOW FREQUENCY
SECTION
BOOST SELECT CUT BANDWIDTH SELECT BOOST SELECT CUT POWER
HIGH FREQUENCY BOOST
SECTION
A IN / BYPASS - This switch in BYPASS mode bypasses the EQ section while the amplifier remains
in circuit.
B L.F. BOOST - Shelf - Provides continuously variable BOOST from 0dB to +15dB to the selected low
frequency (control C). Check out the curves on pages 15 & 16.
C LOW FREQUENCY SELECTOR - Used for both L.F. BOOST and/or CUT. For BOOST or CUT
this frequency is almost the maximum of the curve. With maximum boost (or cut), lower frequencies
may get 3 dB more boost (or cut).
D L.F. CUT - Shel f - Provides continuously variable CUT from 0dB to +16dB to the selected low
frequency ( control C). Many use a combination of boost and cut to get an interesting shape. The typical
effect is boosed lows with a dip in the low mids or mids. Why ? Because the boost and cut are not mirror
images of each other. The cut stetches higher.
E BANDWIDTH - This continuously variable control affects the width of the HIGH FREQUENCY
BOOST effect. Counter-clockwise (around 1) is narrow or a high Q. Clockwise is a larger bandwidth,
wider or lower Q. The maximum boost of 20 dB occurs at narrow bandwidths and goes to 13 or 14 dB
with wider bandwidth. Because the area stays somewhat constant it does not sound like lost boost. The
bandwidth also tends to get slightly narrower with higher H.F. BOOST frequencies - normal for
passive EQs. This knob may seem reversed if one is used to modern parametrics.
F H.F. BOOST - Peaking - Provides Continuously variable BOOST from 0 to +20dB to the selected
high frequency (select control G). The maximum amount of H.F. BOOST is affected also by the
BANDWIDTH control. (see E)
G HIGH FREQUENCY BOOST SELECT - Selects at which frequency maximum operation of the H.F.
BOOST section occurs. The frequencies are marked in KiloHertz.
H HIGH FREQUENCY CUT - Shelf - Provides continuously variable CUT from 0 to -21dB of the
extreme high frequencies.
I HIGH FREQUENCY CUT SELECT - Selects at which frequency the H.F. CUT control occurs.
The frequency is about half way down the curve (max =-21dB, at selected freq = -12 dB)
J LED - When power is first turned on the LED is RED. This means that the EQ is muted until the tubes
are warmed up. It prevents thumps and pops. About 20 seconds later the LED turns GREEN and the
EQ will pass audio. This circuit is smart enough to ignore a quick black-out.
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