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Genz Benz Shenandoah

SHEN-CPK-8T

Featherweight Acoustic Guitar Amp

Peter Kun Frary, Professor of Music • Leeward CC


Acoustic Guitar Amps

Acoustic guitar amps have more in common with stereo systems than traditional electric guitar amps. What's the difference? Acoustic amps are designed for a neutral full-range sound rather than a colored electric guitar tone (e.g., crunch & distortion). In other words, a dedicated acoustic amp should faithfully render natural tone rather than color and process it. Thus, these amps have high power ratings so tone is clean, a full range speaker system with woofer and tweeter and ultra sensitive preamp inputs optimized for the low output of piezo pickups.

Unfortunately, acoustic amps tend to be optimized for steel-strings and often don't get classical guitar tone right, even with dial diddling. As a hardened nylon-string player, I'm always looking for the holy grail of amps. Is the CPK-8T sent from heaven? Well, maybe not but it's pretty dad burn good.

Genz Benz Shenandoah SHEN-CPK-8T

Genz Benz SHEN-CPK-8T

I jacked in my Hirade TH8SS, TH90 and Takamine LTD 2012C Michi (high end classicals with Cool Tubes preamps) and was greeted with thin tone. Amp tone controls were set flat and such was expected. I diddled the controls, hoping to fatten the mids and reduce lower highs. And, yes, the heavens opened and out came fat and sweet tone. Basically 2 notches added to mids (at 250Hz), 2 notches treble cut, bass flat and tweeter set to -6Db and I was good to go. Not a hint of harshness or piezo quack to be found. Guitar onboard preamps were set flat.

The CPK-T8 sounded great in my small living room but that's not a good test. I also auditioned the CPK-T8 in a symphonic band rehearsal room where I teach, a mammoth space with sound treatment to deaden resonance. What a different response! The room ate the bass and highs, requiring a lot more EQ boost than needed at home. Oddly, my Trace Acoustic amps hardly need any EQ changes in these two environments (only slight high boost in band room).

In terms of tone quality, the CPK-T8 just trails my Trace Acoustic TA50R and wipes the floor with the Loudbox Mini. However, the CPK-T8 is more complicated to dial in the tone I like, needing more and larger EQ tweaks than the Trace when I change venues. I suspect the CPK-T8 interacts with room acoustics more than the Trace. Trace projection is more dispersed and omnidirectional whereas the Genz Benz is more directional, shooting straight forward. For dinner and wedding gigs I prefer omnidirectional projection due to the better coverage.

Genz Benz specs the frequency range of this amp at 65Hz to 20,000. Indeed the 8-inch speaker delivered rich and balanced bass tones from my Hirades, even in drop-D tuning. I found timbre a little too bright with the tweeter engaged and prefer it disabled or cut -6 Db depending on the room (via rear switch). I'm guessing steel-string players would like the extra chime of the tweeter.

And, yes, this little amp cranks, blowing my Trace Acoustic TA50R out of the water in sheer volume. I mainly play solo dinner and wedding gigs so I never need to play this loud, but an acoustic rocker would be happy, especially with the extra crank of the matched extension speaker.

Digital Effects

The onboard digital effects are so-so and my main disappointment with this amp. I'm looking for natural tone and found most of the 15 patches bright, thin and gimmicky. The chorus and rotating speaker effects are horrid. I had great hopes for the two hall patches but they made the amp tone thin when mixed only 25% (9:00). At 50:50 (12:00) I sounded like the tinman! Even a budget standalone unit like the Microverb beat these 15 patches senseless. In contrast the Alesis effects in my 1990s Trace Acoustic TA50R sound a lot better: warm, sweet and complex.

The good news is the CPK-8T has an effects loop and you can easily mix in your favorite effects. But just one decent built-in hall reverb would have been nice for gigs.

Mic Input

My Shure 849 condenser mic sounds rich and natural jacked into my Fishman Loudbox but is bright, boxy and prone to feedback with the CPK-T8. No matter how I diddled the tone controls I could not dial in a natural tone. I could improve it but not enough to suit my ears. My Neumann KM184 fared better but still didn't make the cut. I don't own a dynamic mic so a different mic might make a better sonic match. In fairness, the Shure 849 isn't any good through my TA50R either. I bought the amp to use with piezo pickups so no biggie but if mics are your main thing you may not be happy.

CPK-8T Rear Panel: XLR outputs, effect loop, line level input and output for an extension speaker. The head is easily removable if you need to travel light and jack into a larger system. Without the cab the head becomes a deluxe preamp/direct box.

Appearance & Construction

The diminutive CPK-8T has an attractive vintage vibe and is more handsome than the product pictures. Due to the small size, the this micro amp almost disappears on stage. I prefer black vinyl over the stock reddish brown exterior but Genz Benz doesn't offer color choices.

The knurled metal knobs, rather than plastic, are a nice touch and lend a precision feel to knob twisting. One gotcha: the blue LED pilot light is really bright and can be distracting in dimmer venues. In my lamp lit living room I find the panel difficult to see due to the glare from the LED. Of course, no problem in bright sunlight.

The cabinet has one unusual feature: a built-in kickstand. Give it a good tug and two rubber tipped legs drop down, allowing about a 15 degree tilt. The kickstand is reasonably beefy and certainly better than the one used on Roland acoustic amps. Use of the kickstand reduces bass response in some rooms--you lose coupling to the floor--so it may not be desirable in all venues.

At 16.5 lbs this amp is extremely light, lighter than both my Loudbox Mini and TA50R. It appears to be made of quality materials and sports good fit and finish. The cabinet is plywood and will probably handle knocks better than the dense particleboard common in amp and speaker construction.

Removable Head

The lightweight cabinet design of the Shenandoah Compak 300 combos offer a unique removable amplifier chassis. Simply twist two knurled metal knobs, and pull it forward. This feature allows the player to extract the amp and use it for larger venues, transporting it in the pocket of a messenger or gig bag. Once extracted, the head may be used as a directbox with high quality tone shaping preamp controls.

RFI Resistance

Finally, this amp has a single feature worth its weight in gold: RFI filters. I live and work in a city full of radio and TV transmitting towers. Cheap amps and mixing boards act like radio receivers and it ain't cool to have classic rock stations randomly interrupting sets or tracks. This amazing amp is well shielded and has RFI filters on all preamp inputs. And they really work. I'm about 2 blocks from a radio tower and I can crank this amp and only hear my sweet ones.

Last Words

For under saddle pickup classical guitar amplification the CPK-T8 does exceedingly well: excellent dynamics and tone, even response up and down the neck, nixes RFI and resists feedback with a little care. For value and use as an acoustic guitar amp, I award it an "A". For the weak onboard digital effects and mic performance I have to downgrade the overall grade to B+.

The CPK-T8 packs a lot of punch and tone for under a grand ($900 street price) and is certainly one of the best sounding small amps for piezo driven acoustic guitarists gigging in small venues. Yes, there are compromises in the effects and mic section, but it gets the most important things right and is overall a great micro amp. Genz Benz is one of the many companies swallowed up by Fender and is listed as a KMC company. Hopefully Fender keeps the Genz Benz design team stateside as they're doing a great job.

Basic Specs

• 175W (combo) 300W (extension speaker)
• Lightweight Class D Power Amp Technology
• 2 Channel Preamp Design w/XLR and ¼” Inputs
• All Channel Inputs Mix Together
• Active 3 Band EQ with Sweepable Midrange
• DSP w/15 Preset Programs
• Phantom Power for Condenser Mics
• 3 Separate Direct Outputs
• Auxiliary Input
• Headphone Jack
• Strap Handle
• Lightweight Plywood Construction
• Bottom-mounted Tilt Foot
16.5 lbs
• 13 1/4" x 11 1/4" x 11 3/8"

Buy a Genz Benz SHEN-CPK-8T Amp

10/15/2012

©Copyright 2012 by Peter Kun Frary • All Rights Reserved

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