Ovation OP-24Plus User manual

G U I
T A R
S
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
OP-24PLUSPREAMP
Owner‘s Manual

2 EN | OP-24 Plus preamp
OP-24 Plus preamp
INTRODUCTION
Congratulations and thank you for selecting an Ovation Acoustic/Electric guitar
equipped with the OP-24Plus preamp. Please read this brief manual thoroughly to
insure you get the best performance from your new Ovation.
The Ovation OP-24 Plus preamp access a wide range of „studio quality“ contempo-
rary acoustic/electric guitar sounds offering a player tremendous control and sonic
flexibility. The circuitry is exceptionally quiet and adds no unwanted coloration.
Referring to fig. 1, you,ll see the layout and nomenclature associated with the control
features if these unit.
PREAMP FEATURES & FUNCTIONS
The preamp audio circuitry is whisper with very low distorion. (see specifications
table) Tone control is greatly enhanced with a „three-and-a-half“ (we‘ll talk about
that later) band graphic equalizer. Moreover, you can connect your guitar to a wide
range of audio amplifier and recording equiment with the preamp standard 1/4“ Hi-Z,
unbalance phone jack output.
CONNECTIONS
Near the endpin of a guitar featuring these preamps, you‘ll notice a 1/4“ phone jack.
This jack provides the signal from the preamp to any of a number of audio devices.
mixers, effects, amps.
THE HIZ CONNECTION
To connect your guitar to any high impedance (Hi-Z) acoustic guitar amp or mixer, use
a standard, shielded, 1/4“ guitar cable inserted into the 1/4“ jack on the guitar. The
preamp will drive most audio equipment with rated inputs down to about 1000 Ohms
(this mean you can connect to almost anything). If you have a battery installed in the
guitar, you‘re ready to play.
OPERATION
Make sure a fresh 9V battery is installed into the battery compartment of your guitar.
The battery will fit only one way to assure correct polarity. Plugging a 1/4“ shielded
guitar cable into the jack on the guitar activates the electronics in your guitar. Please
note that the tuner will operate without „plugging in.“ After connecting the guitar,
plug into a PA or acoustic guitar amp for best results.

3 EN | OP-24 Plus preamp
CONTROLS
Please refer again to figure .1 to help yourself associate control names with their
functions.
1. VOLUME
This slide control allows you to set the output level of the preamp.
Moving the slider toward the top increases the output level. The OP-24 Plus can
output a very potent signal, so be careful not to „overdrive“ your amp or mixer. If you
notice any unwanted signal coloration, just reduce the output level of the guitar with
this control.
2. BATTERY LOW
The indicator performs two functions. First, when you plug in a cable to the output
jack, it will flash briefly to indicate that a battery is present. If no flash is evident, your
battery is either dead or not installed. Secondly, this indicator will illuminate (and stay
on), if the voltage of battery installed in the guitar dips be low about 7 volts. Replace
the battery as soon as possible. With average use, expect about 100 hours of operati-
on per battery.
3. EQ Controls
The EQ section allows you to accent or attenuate certain frequency bands within the
guitar‘s audio spectrum. When all of the controls are in the center (detent) position,
signals pass through the circuit unaltered. Raising an EQ knob above the center
UKIPCNEQNQTCVKQPLWUVTGFWEGVJGQWVRWVNGXGNQHVJGIWKVCTYKVJVJKUEQPVTQN
%QPVTQNU
2NGCUGTGHGTCICKPVQHKIWTGVQJGNR[QWTUGNHCUUQEKCVGEQPVTQNPCOGUYKVJVJGKTHWPEVKQPU
8QNWOG
$CVVGT[.QY
6JKUUNKFGEQPVTQNCNNQYU[QWVQUGVVJGQWVRWVNGXGNQHVJGRTGCOR
/QXKPIVJGUNKFGTVQYCTFVJGVQRKPETGCUGUVJGQWVRWVNGXGN6JG122NWUECPQWVRWVCXGT[
RQVGPVUKIPCNUQDGECTGHWNPQVVQȟQXGTFTKXGȟ[QWTCORQTOKZGT+H[QWPQVKEGCP[WPYCPVGF
6JGKPFKECVQTRGTHQTOUVYQHWPEVKQPU(KTUVYJGP[QWRNWIKPCECDNGVQVJGQWVRWVLCEMKVYKNN
(KIWTG
$CVVGT[.QY
6JGKPFKECVQTRGTHQTOUVYQHWPEVKQPU(KTUVYJGP[QWRNWIKPCECDNGVQVJGQWVRWVLCEMKVYKNN
HNCUJDTKGHN[VQKPFKECVGVJCVCDCVVGT[KURTGUGPV+HPQHNCUJKUGXKFGPV[QWTDCVVGT[KUGKVJGT
FGCFQTPQVKPUVCNNGF5GEQPFN[VJKUKPFKECVQTYKNNKNNWOKPCVGCPFUVC[QPKHVJGXQNVCIGQH
DCVVGT[KPUVCNNGFKPVJGIWKVCTFKRUDGNQYCDQWVXQNVU4GRNCEGVJGDCVVGT[CUUQQPCU
RQUUKDNG9KVJCXGTCIGWUGGZRGEVCDQWVJQWTUQHQRGTCVKQPRGTDCVVGT[
'3%QPVTQNU
6JG'3UGEVKQPCNNQYU[QWVQCEEGPVQTCVVGPWCVGEGTVCKPHTGSWGPE[DCPFUYKVJKPVJGIWKVCTğU
CWFKQURGEVTWO9JGPCNNQHVJGEQPVTQNUCTGKPVJGEGPVGTFGVGPVRQUKVKQPUKIPCNURCUU
VJTQWIJVJGEKTEWKVWPCNVGTGF4CKUKPICP'3MPQDCDQXGVJGEGPVGTRQUKVKQPKPETGCUGUVJG
HTGSWGPE[QHVJG/KF'3EQPVTQND[TQWIJN[QPGQEVCXG
6JG.QY'3EQPVTQNCNNQYU[QWVQKPETGCUGQTTGFWEGVJGUQWPFKPVJGDCUUTGIKQP
4CKUGVJKUEQPVTQNCDQXGVJGEGPVGTRQUKVKQPVQCFFHWNNPGUUQTDQVVQOVQ[QWTUQWPF
GPGTI[EQPVCKPGFYKVJKPVJCVURGEVTWO.KMGYKUGOQXKPIVJGEQPVTQNDGNQYVJGEGPVGTRQUKVKQP
FGETGCUGUVJGUKIPCNUYKVJKPVJCVDCPF
6JG122NWURTGCORQHHGTUF$EQPVTQNUKOWNVCPGQWUN[QXGTVJTGGFKUETGVGTCPIGUQH
&GCORJCUK\KPIVJKUDCPFTGUWNVU+CNKIJVGTNGUURQPFGTQWUUQWPFSWCNKV[
6JG*KIJ'3EQPVTQNRGTHQTOUUKOKNCTN[VQVJGȟ.QYȟEQPVTQNGZEGRVVJCVKVUGHHGEVUJCRGUVJG
JKIJHTGSWGPE[QTVTGDNGDCPF+PETGCUGVJKUEQPVTQNHQTDTKIJVQTCKT[UQWPFUQTFGETGCUGHQT
FCTMGTQTTQWPFVQPCNKVKGU
VJGIWKVCTğUUQPKEURGEVTWO+PCFFKVKQPYKVJVJG/KF5JKHVUYKVEJ[QWECPEJCPIGVJGEGPVGT
156
23 4

4 EN | OP-24 Plus preamp
position increases the energy contained within that spectrum. Likewise, moving the
control below the center position decreases the signals within that band.
The OP-24Plus preamp offers ± 12dB control simultaneously over three discrete
ranges of the guitar‘s sonic spectrum. In addition, with the Mid-Shift switch, you can
change the center frequency of the Mid EQ control by roughly one octave.
The Low EQ control allows you to increase or reduce the sound in the bass region.
Raise this control above the center position to add fullness or bottom to your sound.
De-amphasizing this band results I a lighter, less ponderous sound quality.
The High EQ control performs similarly to the „Low“ control except that its effect sha-
pes the high frequency, or treble band. Increase this control for bright or airy sounds,
or decrease for darker or round tonalities.
Much like the High and Low controls, The Mid-band control adds coloration to one
of two user-selectable midrange frequencies. With the Mid-shift switch in the 400Hz
position(down), the mid EQ is effective controlling „nasal“ tone qualities while in the
1KHz position, the mid control can add punch in upper mids or help „round off“ the
attack present in this frequency spectrum.
4. 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.
5. Mid-Shift
As discussed above, this switch allows you select the center of the frequency band in
which you would like th Mid control to operate.
6. Pre-Shape
By engaging this control (switch in the „down“ opsition), 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 setting you „Dail in“ with the three EQ controls.

5 EN | OP-24 Plus preamp
Specifications
Current Draw 5mA @ 9VDC
Flat Ref. Level -7.5dB
Freq. Response 20Hz~20KHz (±0.5dB)
S/N Ratio 91dB (EQ bypass)
89dB (EQ in w/flat setting)
84dB (EQ in w/max setting)
Low EQ ± 13dB @ 80Hz
Mid EQ ± 12dB @ 400Hz
± 16dB @ 1KHz
High EQ ± 12dB @ 10kHz
Output Max. Level @ 10k Ohm
4Vp-p (1.4Vrms)
T.H.D < .28% @ 500mV input
Low Battery 7.5V

6 EN | OP-24 Plus preamp
GEWA music GmbH | Oelsnitzer Str. 58 | 08626 Adorf / Germany
A BRAND OF
G U I T A R S
ovationguitars
ovationguitarsofficial
ovationguitarsofficial
ovationguitars.com
//