Doubler Bass Amplifier (Mark II Updated Version)

(4 reviews) Write a Review
To Continental US (Lower 48)
  • Doubler Mark II Bass Amplifier, front
  • Doubler Mark II Bass Amplifier, back
Our Low Price: $895.00
Found a lower price?

Frequently bought together:


The Doubler Amp, from Euphonic Audio (EA), has been a great product for many years -- so great, that it's the amp I personally use in my own rig for both electric and upright bass. Small, lightweight, and powerful, it is capable of very transparent sound, but can also dial in a killer electric bass tone with its very carefully dialed-in EQ points. But it's delightfully simple to operate, with straight-forward controls.

It also has flexibility, with its two separate input channels. You have the ability to switch between two basses, OR use one bass with two different EQ/volume settings, OR even blend two channels together. With its special multiple inputs on channel 2, you can even mix the channel 1/4" input with a phantom-powered XLR input -- so if you play upright and want to blend a pickup with a mic (even a condenser) that capability is built-in.

Includes our exclusive Gollihur Music tipsheet to get the most out of your purchaseYou can use an optional foot switch to switch between the channels, and even a dual footswitch adds the capability to mute the amp (and you can use the effects send as a tuner output so you can tune silently.) And the built-in parallel effects loop provides many more options.

How do you improve on something so good? EA has found a way.

The new amp has several updates; most will be happy to hear that it's received a nice bump in wattage to 625w at 4ohms. It's also had improvements made to the notch filter, and the 1/4" TRS DI output has been replaced by a proper XLR -- so no more "breakout cables" are needed to interface with the sound engineer. And the cosmetics have been nicely upgraded; the corners are rounded, the whole amp has a much more modern appearance and isn't so "boxy" as it used to be. And the cooling fan only comes on as needed, and a new quieter fan unit does the job even more silently. And the 120/240v adjustment for foreign use is no longer an internal jumper -- a switch is now on the back of the unit, next to the power plug.

Acoustic Bass players are going to love these useful features...

  • Variable Phase control 0 to 180 degrees, alters phase alignment when blending channels
  • Variable notch filter 50-600Hz with moderately high Q, to reduce gain at a selectable frequency for feedback reduction on channel 2
  • High pass filter (allows you to reduce the output below a certain frequency, to help with boomy rooms and stages).
  • XLR (balanced low impedance) input for microphone or other devices
  • Switchable phantom power (48v) for the XLR input

The Wizzy 10 can make an excellent companion speaker for a powerful yet compact rig. In spite of being so light and compact it can deliver quite a punch. At the right is a photo of true Bass Bliss, with Bob at a September 2008 outdoor party gig playing a Micro/Wizzy 10 rig. Carrying it in and out of a gig was bliss, too.

All this and more in a compact package weighing less than 5 pounds!

  • Inputs: Two separate and distinct channels with individual controls.
    • 1 Meg ohm input impedance on both 1/4" inputs
    • Channel 2 has XLR input with phantom power
  • Boost controls to adjust the overall level of channel one, channel two
  • Intelligent Input Switching with optional footswitch; you can use a single or double momentary contact footswitch (examples of footswitches that should be compatible are the Boss FS-6 and Rolls RP8)
    • With one instrument plugged in, the switch toggles the instrument between channel one and channel two, so there can be different settings
    • with two instruments plugged in, the switch moves from channel one » channel two » both
    • a single footswitch controls the Intelligent Input Switching; when a double (¼" TRS plug) switch is used, the second button controls the mute function
  • Controls: Channel switch, Input gain, 3-Band EQ, Master Volume, Mute switch, Effects loop blend
  • EQ: Low, Mid, and High for each channel - Channel 1 Mid EQ set at 500Hz for electric bass, Channel 2 Mid EQ set at 800Hz for upright/acoustic bass
  • Effects Loop: Parallel effects loop with blend control
  • Outputs:
    • Speakon speaker,
    • tuner ¼ jack
    • effects send ¼ jack
    • balanced DI out (XLR)
  • Channel 1 Mid EQ set at 500Hz for better compatibility with electric bass
  • Channel 2 Mid EQ set at 800Hz for better compatibility with upright/acoustic bass
  • 1 Megohm input impedance on both 1/4" inputs
  • Frequency Response: 20Hz to 20kHz ± 3dB
  • Power Output: 625 watts @ 4 or 2* ohms; 450 watts @ 8 ohms
    * In practice, the amp will run a 2ohm speaker load at moderate power with no problems. If you need more volume than that, you really need a more powerful amp.
  • Line Voltage: 100/120 - 240v selectable by rear panel switch
  • Size: 2.5"H x 11.25"W x 7.5"D (including knobs)
  • Weight: 4.75 lb
  • Tiny internal cooling fan, thermostat controlled
  • Thermal and overload protection
  • Classy brushed aluminum look chassis with black and red artwork
  • Variable notch filter on channel 2, to reduce gain at a selectable frequency for feedback reduction
  • High pass filter with three cutoff frequency choices per channel (allows you to reduce response below a certain frequency, to help with boomy rooms and stages)
  • XLR (balanced low impedance) input for microphone or other devices
  • Switchable phantom power (48v) for the XLR input

Internal switches and jumpers control...

  • choose between pre- and post-EQ for the DI output (default: set to pre-EQ)
  • choose what output signals are muted by the footswitch
    • speaker output and tuner output muted
    • speaker output muted only (default)
    • tuner output muted only
  • 48v Phantom Power active on XLR input
  • Boost on/off for channels 1 and 2
  • High-pass filter cutoff frequency for each channel (25Hz/80Hz/50Hz)


EA thinks you're smart: They use REAL Volume Controls

Rather than have all the volume in the first turn of the knob, EA uses potentiometers that are more linear. This means you may actually have to turn the master volume all the way up to the 3 o'clock position when things get really, really loud. This gives you a more realistic measure of how much power you are using. Most other amp manufacturers (and think stereos, car radios, etc.) use a taper that puts all the volume up front. This is to impress unsuspecting customers trying gear in stores. "Wow, listen to how loud it is, and it's only on 2? ," he says, and thinks to himself, ”This thing must get really loud!!”

Nope, they're just fooling with you. It pretty much stops getting louder around 5, and then only gets more distorted. EA thinks it's better to use the entire volume control. You'll otherwise never actually attain the mythic eleven.

Is this an EA Exclusive?? We're not sure, but we think others should follow their example. Euphonic Audio says respect your customers, don't try to fool them.


7 Day Trial on all amplifier purchases at Gollihur Music7 Day Trial Period on Amplifiers and Speaker Cabinets

We know that it's tough to buy new gear over the Internet. So purchasers have a seven (7) day trial period during which they may return the amp in new condition -- NO QUESTIONS ASKED! -- for a full refund, minus all shipping costs and a small transaction fee to cover credit card processing. Call or email us first: returns must be preauthorized; a restocking fee applies if the unit is not returned in new condition.




Product Manual

Need to figure out some of the more in-depth features of this product? Here's a copy of the manual, in PDF format, here.

You may wish to visit the manufacturer's website to see if a more recent version is available.



View AllClose

Warranty Information

Limited Warranty The warranty for Euphonic Audio Amplifiers and Speaker Cabinets is THREE YEARS from the date of purchase. This covers defects in material and workmanship for the ORIGINAL owner.

The warranty is void under the following conditions:
  • If the unit has been damaged due to accident, improper handling, installation or operation
  • If the unit has been damaged in shipping
  • Abuse or misuse. This includes exceeding the physical limitations of amplifier or speaker cabinet, i.e. using excessive bass boost in the Wizzy 10.
  • Unauthorized repair or attempted repair
  • If the serial number has been defaced or removed
Euphonic Audio, Inc. reserves the right to make such determination of the above on the basis of factory inspection.

All liability for any incidental or consequential damage for breach or any expressed or implied warranties is disclaimed and excluded here from.

Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental and/or consequential damages, so that the above limitation or exclusion may not apply to you. This warranty gives specific legal rights and you may also have other rights, which vary from state to state.

Repair Procedure
Please follow these steps if your equipment requires repair:
  1. Locate your original bill of sale which should include date and place of purchase.
  2. Call, FAX or write to Euphonic Audio describing the problem and for issue of a Return Authorization Number (RA)
  3. Pack the unit carefully, preferably in the original shipping carton, enclose a brief description of the problem, and a copy of the Bill of Sale. Write the RA number on the carton and ship prepaid to the factory. Please be sure to properly insure the unit when shipping it.
  4. If it is determined that the unit is under warranty, we will repair the unit as deemed appropriate (repair or replacement parts) free of charge and return the repaired unit to you.
  5. If it is determined that the unit is not under warranty, we will return the repaired unit COD for the cost of repair, shipping and insurance.
View AllClose

4 Reviews

  • 5
    Almost eerily good

    Posted by Michael C on Oct 7th 2017

    I just wanted to let you know that the package arrive today. (The EA Doubler) is a beautiful piece of equipment and sounds great through my new speaker. I got pretty loud in my apartment and the sound was beautiful. It was very clear and without any color whatsoever. It’s almost eerie to hear things that cleanly and purely. Thank you again for all of your help. I will highly recommend you to anyone who requires services such as the ones that you provide.

  • 5
    Incredible sound

    Posted by Pat G on Dec 12th 2012

    Hi Mark, Just a quick mail. Got the EA doubler amp/ Wizzy 12 cab the other day and absolutely LOVE them. I did a small concert hall gig (300 people) and we only used PA for the piano. The amp sound (my DPA and pick-up blend) was incredible and more than enough. Thank you again for getting it to me so quickly and with such great service. You are the working bassist's best friend! Arigatou! (from Tokyo, Japan)

  • 5
    My life is changed

    Posted by Mark P on Sep 7th 2010

    I got my EA Doubler and Wizzy 12 on Friday, and put them to use at a gig on Saturday. My life is changed. Thanks for your advice and for all the tips you give on your website and send with the products. You rock.

  • 5
    Very pleased, nice and punchy

    Posted by Neal Wilson on Apr 2nd 2010

    Hi Gollihur Music, I received my EA Doubler today and I'm very pleased. I actually had a doubling gig tonight to put it through its paces- with a 7 piece traditional country band. The electric bass was nice & punchy & the upright was clear. It was medium volume and the amp stayed cool to the touch all night. Definitely a keeper.

View AllClose