OP-24Plus
®
OP-24Plus C
®
Acoustic/Electric Guitar Preamps
Owner's Manual
Ovation Instruments
Division Of Kaman Music Corporation
37 Greenwoods Road
New Hartford, CT 06057
www.kamanmusic.com
Printed In U.S.A.
990153-C
Specifications: OP24Plus
Current Draw:
5mA @ 9VDC
Flat Ref. Level:
-7.5dB
Freq. Response:
20Hz-20KHz (
±
0.5dB)
Signal to Noise:
EQ bypass
- 91dB
EQ in w/flat setting:
- 89dB
EQ in w/max High:
- 84dB
EQ Response:
Low:
±
13dB @ 80Hz
Mid:
±
12dB @ 400Hz
±
6dB @ 1KHz (shift)
High
±
12dB @ 10KHz
Output: Max. Level @ 10K Ohm:
4Vp-p
1.4VRMS
THD:
< .28% @ 500mV input
Tuner "On" Time:
30 Seconds
Low Battery "ON" voltage:
7.7V
EQ In/Out
This push-button enables you to engage or defeat the EQ section.
When the switch is in the depressed position, the EQ is active.
Mid-Shift
As discussed above, this switch allows you select the cen-
ter of the frequency band in which you would like the Mid
control to operate.
Pre-Shape
By engaging this control (switch in the "down" position), you
add a fixed EQ curve on the sound from the pickup. Technically
speaking, when the pre-shape circuit is in operation, the bass
and treble frequencies are enhanced while at the same time,
mid range response is attenuated. This pre-emphasis can be
used alone, or with any other EQ settings you "dial in" with the
three EQ controls.
Tuner (OP24 Plus C only)
Pushing the tuner button activates the built-in tuner. When turned
on, the green "OK" LED flashes. Playing a note on your guitar will
illuminate a "note" LED on the bottom row which indicates the
name of the note played. If this note is a sharp (or flat) the LED on
the far right will also light. In addition to these LEDs, one of the
three indicators in the row above will turn on. If the note you're
playing is substantially flat, the left LED will glow brightly and, as
you tune the string sharper, this "flat" LED will get dimmer and
finally shut off as the "OK" LED lights to indicate that the pitch
you're playing is in tune. Likewise, if you're playing a note that is
sharper than the correct pitch, the "Sharp" LED will light. Tuning
the string lower will cause this LED to dim and finally yield to the
"OK" LED.
It is not usual to perform the tuning procedure on all strings more
than once to get your instrument tuned correctly, especially if you're
using new strings. Although there is a built-in auto-off feature for
the tuner circuit, to conserve battery power, it's a good idea to
push the tuner button again to manually turn off the circuit when
you're done tuning.
Specifications: OP24Plus C
Current Draw:
6mA @ 9VDC Tuner Off
10.8mA Tuner On Max.
0.4uA Off
Flat Ref. Level:
-7.5dB
Freq. Response:
20Hz-20KHz (
±
0.5dB)
Signal to Noise:
EQ bypass
- 91dB
EQ in w/flat setting:
- 89dB
EQ in w/max High:
- 84dB
EQ Response:
Low:
±
10dB @ 134Hz
Mid:
±
12dB @ 400Hz
±
7dB @ 880Hz (shift)
High
±
10dB @ 10KHz
Output:
Max. Level @ 10K Ohm:
4Vp-p
1.4VRMS
THD:
< .28% @ 500mV input
Tuner Accuracy:
<.1%
Low Battery "ON":
7.7V
