CoolCrunch

CoolCrunch is made to attenuate the volume on the speakers without lowering the master volume of the amp …
One keep then the crunch without breaking the ears …
Thanks to its small size and simplicity, it fits inside the combos and in your budget.

CoolCrunch 5 & 30. Logo

CoolCrunch5. Speaker attenuator in a Fender Champ 57 reissue

A CoolCrunch5 prototype installed on the back of a Champ 57 reissue.

The more the tube amplifier that we offered is typed, and the more it requires certain conditions of drive and level to sound well … But everything depends on the places :
A Champ 57 or a Blues Junior can be perfect in clubs but brutal at home or in a very small place: how to still let them breathe and crunch ?

At home, we can use a tiny amp: it’s the logic of my microCombos… But we may also want to keep his favorite gear. CoolCrunch responds to this desire by letting the amp sing as it pleases without screaming …
And in addition it offers a credible line output for PA coupling or recording.


Main features

Power capacity: 5W RMS or 30W RMS.
Progressive attenuation by potentiometer.
Bypass Switch to put the HP back online.
Line out to connect the amp to PA, with its own grain.

CoolCrunch, speaker atténuator. Controls and internal wiring.

Prototype of CoolCrunch30.
The enclosure before implantation.
Internal view of the wiring and the power potentiometer.


Guitar Poppa’s choices

CoolCrunch is adaptated to powers that remain modest: 5W and 30W.
it aims for small amps, those that come and go between scene, rehearsal and home.
The reduced dimensions of the box facilitate its integration into the existing.
Safety and price are also easier to master in this power range.

Contact us for higher powers

Simplicity of construction and safety
The power connections are wired and soldered.
The industrial wire wound potentiometer provides a progressive and reliable attenuation.
The amp “sees” in all cases a load impedance of 4 to 15 ohms, which remains inside the standard values of tube technology. It runs therefore no risk.

A simple but proven line output.
It is constantly available and comes out in low impedance.
The signal is taken from the output of the amp, and therefore retains the grain of the beast.
It is then attenuated and filtered to obtain a standard guitar level.
The bass is limited below 80Hz (avoids the cheap boombox effect …)
The treble is limited above 5KHz (respects the spectrum of HP guitar)


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Versions and options

Common features

Enclosure
Molded aluminum. Facade 110x60mm, depth 50 mm approximately.
Vertical or horizontal orientation to choose optional when ordering.

Attenuation potentiometer
Industrial power model, wound on ceramic.
Continuous attenuation adjustment from zero level to total power.

Bypass switch
Reconnects instantly the speaker direct to the amp.
“True bypass” structure disconnecting all attenuation components.

Line out
Permanent. Guitar level, low impedance 1kOhm, bandwidth 80Hz to 5KHz.

Two versions :
5W et 30W maximum

CoolCrunch30 & CoolCrunch30. Speaker attenuators for amps 5w and 30W

Choosing the version

Choose a power rating equal to or greater than the power of the amp into 8 ohms.

Connection options

Input, (receives the amp output):
— 40cm cable + Jack 6.35 male.
— Or 6.35 female Jack socket.

Output, (to the speakers):
— 50cm cable with FastOn lugs
— Or 6.35 female Jack socket.


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To order…

1. Choose the version.
2. Specify the chosen options.
3. Specify the delivery area.
4. Click <add to the command>.
5. Click <Cart> on the main menu to finalize.

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CoolCrunch5. Speaker attenuator for single end amps 5W (6V6 or EL84)CoolCrunch5
109 €

For amplifiers 5W max :
Single end 1x6V6 or 1xEL84
Push-pull 2xECL82.

Not suitable for amps from 8 to 15W and over :
Single End 1x6L6 or 1xEL34.
Push-pull 2xECL84, 2x6V6 or 2xEL84.
Other characteristics as indicated above.
Connection options and box orientation to select below.

CoolCrunch5





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CoolCrunch30. Speaker attenuator for amps 8w to 30W.CoolCrunch30
Price down : 119 €

For amps from 10 to 25W:
Single end 1xEL34 or 1x6L6,
Push-pull 2xECL84, 2x6V6, 2xEL84, 4x6V6, 4xEL84.
Some 2x6L6 or 2xEL34 power of less than 35W …

Not suitable for 40W amps and up.

Other characteristics as indicated above.
Connection options and box orientation to select below.


CoolCrunch5






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A sound question

Some customers have expressed to me an impression of loss of treble when CoolCrunch is in action in their combo …

This impression is normal, and inherent in making the amp work with an attenuator …

1. A tube amp loses some treble when it runs at high volume.
This happens when it debits heavily in an attenuator, rather than debiting moderately direct in the speaker.
2. In addition, one hear less treble at lower volume.
This physiological effect is added to the first :
one hear with less treble a sound that is already rounded by the amp…
But the attenuator is not in itself responsible for these effects.

The solution is to raise the treble pot to get a dryer crunch…
It will compensate the losses that one perceived.
With fingering and good ear, it works easily and well !


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For information: limits of the warranty

Each model is individually tested on a tube combo.
It is guaranteed two years, parts and labor, against any defect hidden in the device.

On the other hand, Guitar Poppa is not responsible for the deteriorations of the amp which would be caused by a bad connection because of the user:
Inversion of input and output connections; forgetting a connection causing the amp to work without a charge, and damaging the output transformer ; short circuit damaging the tubes and / or the output transformer, or the CoolCrunch potentiometer.

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