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Amplifiers & SpeakersCombo Amps

Acoustic Image CODA Series 4plus Combo Amplifier

         Manufactured by: Acoustic Image

Continental US - larger items may carry a partial shipping charge to AK, HI and PR
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FLAT RATE WORLDWIDE SHIPPING!14 Day Trial Period on Series 4 Acoustic Image amps and speaker cabinets

New owners have a fourteen day trial period during which they may return the amp in new condition -- NO QUESTIONS ASKED! -- for a full refund, minus our outgoing shipping cost and a small transaction fee to cover credit card or PayPal payment processing. Returns must be preauthorized; a restocking fee applies if the unit is not returned in new condition.

The Coda combo (and its matching extension cab) are the newest generation of the amp that started it all; the venerable Contra combo amp. Consisting of an ultra-portable combination of Preamp/Amplifier/Speakers, with a revolutionary down-firing woofer and front-facing mid/high driver for transparent, detailed sound - this is the amp that all other acoustic amplifiers are usually measured against.

With 650 watts of clean power pushing the specially designed speaker array, you'd think you'd have to hire a roadie to help you move your gear - but this amp only weighs around 22 pounds, and is under a foot tall and about a foot around! A one-hand carry is no stretch with this amp; it's very easy to find a place in your car and onstage for this little powerhouse.

The Series 4PLUS Coda combo incorporates a Clarus 2-channel head, mounted into the cabinet using the Cabrio Docking System, which allows you to separate the head from the cabinet for independent use.

A cool built-in "kickstand" mechanism allows the cabinet to be tilted to better direct sound to the player’s listening position. For larger venues, the Ten2 EX (Series 4) extension cabinet is an ideal match.

I use Acoustic Image gear for almost all of my URB and EUB gigs... what wins me over is -- when teamed with a good pickup or mic -- the amp tends to simply make my bass sound acoustically bigger, rather than giving it a separate electric voice.

— Bob

LOTS more detail below!

Bob's first Acoustic Image combo (a Contra) arrived in 1999, and we've been hooked on their incredible amps ever since. Its design was innovative, it was eminently portable, and its sound was unmatched by any other amp on the market. And the smart folks at Acoustic Image didn't rest on their laurels, they continued to hone the design by responding to the needs of their users; over the years, they made them lighter, smaller, and more powerful. Not to mention better-sounding, quieter, and more feature-packed.

They've come a long way since the first series of amps, and we're very proud to have made the journey along with them -- as a valued "partner" (not just a "seller") for Acoustic Image.

So now, we have the next generation of amps. With the advent of the new "Flex" system (see related links, below), Rick Jones -- the bassist and engineer behind the design of these fabulous amps -- seized the opportunity to improve on the design of the Acoustic Image preamps. As of now, all of the two-channel Acoustic Image models -- Ten2, Coda, Corus, and Clarus -- incorporate the new "Flex" design preamp, which features a new four-band EQ, improved effects, and more (see below.) These new models are therefore designated as "Series 4PLUS."

The Coda amplifier is an all-in-one "combo" amp, meaning that it contains a preamplifier, power amplifier, and speaker system in one compact unit. We've broken down our description below into sections so that you can understand the various parts of the whole.

The Preamp:

A key ingredient in Acoustic Image gear is the very careful design of the electronics. They have always been engineered to deliver the natural sound of your instrument, no artificial flavorings or colors. Please answer this question... do you want to hear your instrument or the amp??

Me, too. My specifications for an ideal sound is for a pickup/mic and amp to simply make my bass sound bigger.

Besides the amazing transparent sound, useful features have been designed into the Acoustic Image preamps to provide the most flexibility for various playing situations. For instance, you get -- on each channel -- a parallel effects loop, and a selectable low-cut (aka high pass) filter to help with feedback or “boominess” elimination (see explanation in features list below). You also have on/off access to the built-in digital effects. You get a balanced direct out with ground lift, as well as pre/post setting, to allow connection to a mixing board for PA support, or for recording purposes. There's even a Phase Switch, which alters the phase by 180°, which can often help with acoustic feedback.

The front end also features the input options for either microphones (XLR) or instruments (¼"), and switchable 48v phantom power -- and a 10db gain switch (for low/high output mics) -- is available on the XLR input. Separate Input Level (gain) and Output Volume Controls allow for precise tonal vs. volume control, and a Master Mute Switch allows you to cut the output for silent tuning or for breaks.

The two-channel, Series 4PLUS Coda has two separate channels which can be used to blend two sources - two different pickups or mics (or a combination of the two), or two different instruments. The XLR and ¼" inputs are on separate jacks. Additionally, they are separately buffered, which means that you could effectively use both at once, on each channel. You would only have independent control if at least one of those sources had its own volume control (like a keyboard, or an instrument with an outboard active preamp) but it does open up the possibility of actually "mixing" up to four different sources.

The preamp features a new four-channel equalizer, as follows:
  • Low: Shelving, ±12dB at 50Hz
  • Lo Mid: ±12dB at 250 Hz
  • Hi Mid: ±12dB at 1200 Hz
  • Treble: Shelving, ±12dB at 8 kHz
The built-in Digital Effects can be assigned to either channel (or both/neither), and the amount of the effects in your mixed signal can be adjusted with the level knob. The rate setting is now configurable (!) and the effects include the following presets:
  • Reverb
  • Delay
  • Reverb PLUS Delay
One last new feature - illuminated on/off buttons for the front panel controls to indicate whether the button is on (lit) or off (unlit). This is really helpful on a dark stage!

The Power Amplifier:

More Power!! (please insert your own Tim Allen Home Improvement TV show grunts) Yes, it can put out up to 650 watts (at 4 ohms). That said, the combos are not rock and roll amps — a small combo shouldn't be expected to compete with your 4x10 stack!

Yes, with that sort of power, this combo can get quite loud. But the wattage is there to ensure smooth, clean response. Bass frequencies take a great deal more energy to produce that high frequencies, and the somewhat percussive nature of upright bass can be very demanding. The "extra" energy (commonly called "headroom") is available to cleanly handle those peaks and percussive plucks, so you don't get that "squashed" sort of attack many bass amps often deliver when they hit the wall.

The wattage is certainly handy to have when you have larger gigs, too. Lots of players gig Acoustic Image Clarus heads (which is identical to the preamp/power amp section of this combo) along with a more conventional and efficient speaker cabinet for larger gigs. And since the head "pops out" easily and quickly -- 30 seconds or less, no tools required -- you have that option available to you with this combo! I, myself, have taken the head out of the combo, for use with a larger speaker setup, on electric bass/classic rock gigs. It did an admirable job driving a pair of Euphonic Audio Wizzy 10 cabs -- it makes for a formidible, yet still very light and highly portable, rig.

The Speakers:

The design and performance of the Acoustic Image speaker array is quite revolutionary. The lowest bass frequencies are omnidirectional. As we all know, our acoustic instruments do not radiate only in one direction — their sound moves about the room. The ten inch down-firing woofer in the Acoustic Image combos spreads that sound around naturally, as our ears might expect. There is still plenty of definition, it's just not as annoyingly directional as so many other amps can be. With other amps, you might walk across the front of the stage, and suddenly you walk into a small "zone" where THE BASS is SHOUTING at you. Not with this amp.

But that's only one of the differences between it and other bass amps. These combos have a complement of drivers that results in a full range speaker cabinet. In addition to the woofer, you'll find a five inch cone mid/high driver. Plug your MP3 player in and be amazed at the result! Nice tight bass, with balanced mids and highs; real, uncolored sound. As pure and clear as the sound in front of your instrument, no added "shading."

What you get is flat frequency response across the spectrum, extended, tight, well-controlled natural bass sound, and omnidirectional output below 800 Hz (so you can be heard, without monitors, all over the bandstand) — all in a package that's about foot tall and less than 23 pounds in weight! In fact, the amp virtually disappears on stage leaving behind the natural sound of the bass - it's like having another double bass on stage along with you!

Other Fun Facts to Know and Share

About the 2-way cabinet (didn't AI Combos used to have a tweeter?)
Note: in late 2010, the Acoustic Image combos and speaker cabinets evolved from a three-way (Woofer + Midrange + Tweeter) speaker array to a two-way (Woofer + Mid/High Driver) arrangement. The original tweeter was crossed-over at such a high frequency that some folks couldn't even hear the difference when it was on or off! The new arrangement actually has several benefits:
  • The new proprietary extended range driver, exclusive to Acoustic Image, is smoother and more detailed than the previously used midrange and tweeter combination
  • Using fewer speakers to cover the full frequency range reduces phasing and amplitude anomalies caused by crossovers in multi-speaker systems (translation: all things being equal, two-way systems are better than three-way)
  • The new 5" driver has higher power handling, providing a bit more perceived volume and definition when needed
The Series 4PLUS Coda includes the Cabrio Docking System, which allows you to remove the Clarus head from the combo and use each component separately.

These combo amps were a real breakthrough when first developed by Dr. Rick Jones, a bass player (check out his CD at right for firm cred) as well as founder, and President of Acoustic Image, and they continue to get better with each generation.

What about electric bass?? I have taken my small AI combo out with my five string (low B) fretless electric bass on rather enthusiastic gigs with a drummer. It does a good job, but these are at moderate volumes and I'm not competing with a Fender Twin. For a more aggressive bass, or your Led Zeppelin cover band, you might want a more traditional rig - but in a pinch, this amp can cover the gig. Also see my points about using the head separately, and the sidebar (below) about the head being the ultimate back up amp...

Is the Clarus the Ultimate Back-up Amplifier???
(The removable head in this combo amp is exactly the same, feature-wise, as the Clarus)

These days I actually gig electric bass more than upright (hey, the market dictates what pays, not taste, and I'm sure we both could name some artists that evidence that fact!), and I've been enjoying gigging with the Random Act of Blues this summer of 2011. Anyway, I was auditioning a new bass head that I didn't completely trust, so rather than lug my heavy rack case on this particularly hot day, I stuck a Clarus in one of our Gollihur Gig Bags just in case.

As it turned out, the guitarist's Marshall head died after the first song! I grabbed the Clarus as a temporary replacement; ok, it wasn't a Marshall but he plugged his pedalboard output into it, and it got him through the rest of the set. Thanks to this experience, it occurred to me that the Clarus may be the perfect "backup" amp! Think about it:
  • It is very compact and less than 5 lbs. -- so it's hardly any trouble to carry
  • It has plenty of power to cover bass guitar or URB requirements
  • The Clarus has effects on-board for guitar
  • With its high-pass filter and EQ controls, it can make a solid stage monitor amp
How cool is that?!?

  • Cabrio Docking System allows you to separate the amp and speaker components for separate use!
  • 1/4" or XLR input; input impedances are 1 megohm or 600 ohms based on jack chosen, separately buffered
  • Effects Loops via 1/4" phone jacks for each channel
  • Balanced XLR Line Output with Ground Lift
  • PRE- or POST- switch for XLR output
  • AC Power On/Off switch with LED Indicator
  • 650-Watt (@4 ohms) "Digital" Power Amplifier -- clean power! (Internal speakers are 8 ohms)
  • External Speaker Output (Neutrik Speakon)
  • Two-way Sealed Speaker System
    • 10" Long-throw Low-frequency Woofer
    • 5" Mid/High-frequency Driver
  • Detachable AC Input Connector with Built-in Fuse
  • Dual voltage operation (115v/230v, 50/60 Hz) via automatic switch (comes with USA Cable; to use in other countries, you can source an IEC-C13 AC Cable, also commonly used for computer power supplies.)

  • Lightweight- less than 23 lbs! with Durable Molded Enclosure
  • 12" H x 15" W x 13" D
  • Molded Carry Handles
  • Dust cover with cable pocket and shoulder strap included

Includes Vinyl Cover

Included with all of the combo and extension speaker (EX) models is a lightweight "dust cover" with shoulder strap and accessory pocket. Made of lightweight vinyl, it covers the top and sides of the cabinet, with openings to allow access to the amplifier's integrated handles. It also comes with a carry strap which loops through the openings and the amp handles, allowing you to "shoulder" the amp. The cover is handy - it even has a small pocket for cables, tuners, and other small gigging accessories. But don't expect it to substitute for a case, as it offers only minimal "protection" from slight bumps and other minor hazards. If your gigging needs require something a little more protective, we have other options available separately. Check out the optional padded Mooradian case in the Related Products, below.

The photo at left shows it with the cover on and carry strap ready for transporting. A zippered pouch is provided to carry the power cable and other small items, shown in the photo to the right (without the carry strap). This light-duty cover will not shield the unit from rain, and it does not cover the bottom of the cabinet.
Not 100% Sure? New owners have a fourteen-day trial period during which they may return the amp, in like new condition, for a full refund less actual shipping cost.

This item is made in USA! Click for more 'Made in America' items!

Is this product returnable? Click here for our return policy.
Is there a Factory Warranty? Click here to find Warranty Information for all of our manufacturers.
International customer? Click here for important information about ordering from outside the USA, and what to expect concerning taxes, VAT, delivery times, and more.

Check Out the FAQ Resources That Apply to This Product:
   ACOUSTIC IMAGE COMBOS/SPEAKERS: What's the difference between the Contra, Coda, Corus and TEN²?
   AMPLIFIERS: Why Would I Want a 'Transparent' Sounding Amp?

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Some of our customers have told us what they think about this product.
Check out what they had to say!
Thank you Mark for taking my order on Friday Evening after hours and for the prompt delivery of the Acoustic Image Coda. It is more than amazing and I couldn't be happier. We will be sure to send any business your way because of your excellent service.
Jerry N (August 2012)
For years, I have been a fan of Acoustic Image, using a Series III Clarus with both Epifani UL-110 cabs as well as an Acoustic Image Contra-Ex Cab. My Rob Allen basses have always sounded perfect with the AI gear. Recently, I decided to upgrade to an AI Series 4 Plus Coda because to have it all in one unit. Plus I wanted to upgrade to the newer features (e.g., 4-band eq, on-board effects, headphone output).

Last week I received my Coda from Gollihur Music, and it is everything I hoped for and more. It sounds great with my Rob Allen's. It really captures the natural, organic Rob Allen sound and just makes it louder.

It also sounds very good with my Lull P4. It does not claim to be a full-on rock combo, but it sounds very good to me and works perfect for the light jazz stuff that I love to do. The Presence switch on the speaker is very functional with the P4. I have a few other pre-amps and will be selling one or two because they AI sounds like it will meet most of my needs.

The four-band eq sounds very nice and the on-board reverb effect is handy and sounds very good to my ears. The Coda has a lot of capability and I love how it fits in such a small and easy-to-carry package. It takes up very little space in my practice room. Plus, my cat can't claw it to death because it is not covered in scratch-able material.

I admire the Acoustic Image well-earned reputation for design, quality, and customer service. And, this being my second purchase via Gollihur Music, they deserve a thumbs up for providing accurate information and great customer service as well.

"tedw" (August 2014)
Hi Mark, Just wanted to say thanks for sending the great Acoustic Image amp, but especially for your quick shipping. I wasn't expecting to see the AI until Monday and there it was on Friday afternoon! I unpacked it in my cube at my day job and then a couple of hours later I was using it at my jazz quartet gig in downtown San Jose. Wow - the sound is so clean, transparent and present. Four sets whizzed by and pretty worn out but with a big grin I packed up and headed home. The amp is definitely a "keeper".
Jack M (August 2016)
I just wanted to drop you a line to thank you for helping me to get a great sound from my string bass. I wanted to play my Englelhardt string bass with a 7 piece swing band that included trumpet, sax, trombone, guitar, drums, bass and vocals, but could never seem to get a great, or even good, amplified sound. After explaining the loud environment in which I played, Gollihur recommended, and I purchased, a Krivo magnetic pickup and a preamp to replace the electronics in my Palatino Electric string bass. It sounded pretty decent and was a huge improvement. I tried the pickup on my 1985 Engelhardt EM-1 string bass and it sounded pretty decent but the strings were dead, so I purchased some Corelli 370’s which I love. Unfortunately, I still got a really "boomy" sound from my electric bass amp. I read a lot about the Acoustic Image amps but wasn’t sure that the amplifier would make that big of a difference. After much deliberation, I found and purchased a used Coda II and immediately loved it. I still felt like I needed a bit more, so I took the plunge and bought the Acoustic Image Ten2 X extension cabinet. I cannot say enough good things about this new setup. The direct out is great for larger shows and the amp along with extension cabinet seldom needs to be set above '3' to sound great in any room. The electric bass sounds amazing as well. The fact that the amp and cabinet are super compact and weigh 23 and 27 pounds respectively, is icing on the cake. Lastly, to complete my setup, I bought leather bumpers for both of my basses and a Golihur branded Bass bag for the Engelhardt. I love the bag. The quality is great and as advertised, it goes on and off the bass easily. This is a really longwinded way of saying, THANKS. Thanks to Golihur, I have been able to go from feeling like I had to play electric all the time and could never get a good amplified string bass sound, to having a GREAT, consistently dependable, amplified string bass sound. I now am able to play my string bass for all but the most obviously electric tunes. If players ask, "will the Acoustic Image amp make that big of a difference over their electric bass amp?" I can unreservedly say, "Yes, there is a huge difference." I have a great sound and wanted to share my experience in case it can help any other players whom you may advise.
Michael R. (December 2018)