Kustom Stereo Amplifier KBA 30X User Manual

OWNER’S MANUAL  
KBA30  
Thank you for purchasing the Kustom KBA30 model bass guitar amplifier. Kustom has  
listened to musicians throughout the world and stands proudly behind each and every  
one we make. It was designed with your needs in mind. Flexible, feature laden, great  
sounding, able to adapt to all kinds of music, this amplifier really delivers what you have  
been looking and waiting for. Whatever style you choose, it’s ready!  
Kustom, with a 30 year tradition of excellence in design, proudly delivers to you this  
amp and rewards you with a rugged and dependable amp designed and engineered  
in the USA. Again, thank you for your purchase. Please take a few minutes to learn  
about all the professional features that are built in.  
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KBA30  
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1.) CD/Tape Input - this 1/4” 3 conductor jack will allow you to plug in a CD player, tape or any other source to  
practice along with. It sums the left and right signals into a mono signal and passes it through to the amplifier  
section. To control the volume of the source, adjust the output volume of the device. We suggest you turn the  
volume all the way down then plug in and adjust the volume according to your taste.  
2.) Guitar Input - this is a 1/4” 2 conductor input jack for plugging in your instrument. It is intended for bass guitar  
or Hi-Z microphones but will accept other instruments as well.  
3.) Volume Level - this control is the output volume control for the bass guitar input. Slowly increase the control  
to increase the volume. If you are using a bass guitar with an on-board preamp, set it’s level for a mid position  
before increasing this control otherwise distortion may occur.  
4.) Notch - this control is a dramatic cut filter. It is “notched” at a rate of -15db. The width of the notch is set at  
one octave and can be swept from 45 Hz to 1KHz. It will create a very precise subtraction of undesirable overtones  
or allow you to fine tune your tone settings.  
5.) Low - this control is the bass control. It is active and set to boost or cut frequencies at 60 Hz. This will effect  
the low frequency signals. Turning it fully clockwise, the signal is boosted 15 db. Turning it counterclockwise,  
the low will be rolled off -15db. Especially good for making low output, thin toned bass guitars sound fuller.  
6.) Lo Mid - this control is the Low Midrange control. It is active and set to boost or cut frequencies at 250 Hz.  
This will effect the mid-low frequency signals. Turning it fully clockwise, the signal is boosted 10 db. Turning it  
counterclockwise, the low-mids will be rolled off -10db. Especially good for “cleaning up” muddy bass guitar  
overtones.  
7.) Hi Mid - this control is the High Midrange control. It is active and set to boost or cut frequencies at 1.5KHz.  
This will effect the mid-high frequency signals. Turning it fully clockwise, the signal is boosted 10 db. Turning it  
counterclockwise, the low-mids will be rolled off -10db. Increasing this will add punch to a bass guitars’ sound.  
8.) High - this is the high frequency control. It is active and set to boost or cut frequencies at 8KHz. This will  
effect the high frequency signals. Turning it fully clockwise, the signal is boosted 15 db. Turning it counterclockwise,  
the highs will be rolled off -15db. This will add or subtract the high end attack of slapping style sounds or pick  
attack and clarity.  
9.) Headphone Jack - this is a 1/4” 3 conductor jack for plugging headphones. It will sum the signal and put  
the sound in both ears, thereby creating a pseudo-stereo sound. Volume will be determined by the volume control  
on the channel you are on. It will disconnect the internal speaker when plugged into. This will allow quiet practicing.  
10.) Jewel Light - this jewel light lets you know that the amplifier is on.  
11.) Power - this switch turns on and off the AC power to the amp.  
Back Panel - (not pictured)  
Speaker Out - this is a 2 conductor 1/4” speaker output jack. This will disconnect the internal speaker and allow  
an external speaker cabinet to be employed. Rating is 8 ohms.  
Line Output - this is a 2 conductor 1/4” line output jack. This will allow an external amplifier or mixing board to  
be supplied with the signal from this amp. This is output is attenuated and comes from the power amp signal.  
Effects Loop - these are 2- 2 conductor 1/4” jacks. This will allow an external effects device or equalizer to be  
patched back in before the power amp section in this amp. One is send and the other is return.  
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Suggested Settings  
(These settings are general starting points. They  
are designed to get you close to the sound you are  
looking for. If the control is not shown, then it doesn’t  
apply to this particular sound. )  
Traditional Electric Bass Setting - in this setting the amplifier will deliver a standard  
electric bass sound. Whether you are playing rock, country, blues or gospel, this setting  
will get you close. Because of the Active E.Q., you will be able to dial in your preferences  
from here. If you play with a pick and want less top end attack on the notes, roll off a bit  
of the High control. If it’s deeper bottom your looking for, add more low and low mid. The  
key is to experiment to achieve your own personal sound.  
Funk “Slap” Sounds - this style of music needs a good strong attack sound with lots  
of top end. Usually a hollowed out middle will produce the extra top end necessary for  
the punch needed for this style of music. If you are using a more thumb style, a bit more  
low end and volume might be needed for your particular style of playing. Or less if you  
really hit it hard. Even though this is a practice or rehearsal level amplifier, it will deliver  
the punch and clarity that you require. Remember to try this amp with an additional  
speaker plugged in. You’ll be nicely surprised.  
Alternative Style - this setting is designed for a upper end punch and edge that will cut  
through most any sound. This style will work well with pick or fingers and will add a touch  
of distortion to the sound as well. Make sure your instrument’s volume control is up all  
the way. Since you are adding volume, you need to be careful with the actual amount  
of e.q.. you use as it also can add distortion to the sound. Also, you may want to use a  
compressor pedal in the signal chain before the amp to give it a smoother sound but still  
“edgy”. As in all the settings above, it is strictly a matter of personal taste in a achieving  
the sound you are looking for.....experiment.  
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