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Amplifiers & SpeakersAmplifier Heads

Euphonic Audio Doubler Mark II Bass Amplifier

         Manufactured by: Euphonic Audio


Continental US - larger items may carry a partial shipping charge to AK, HI and PR
All shoppers outside the US State of New Jersey pay NO SALES TAX on any purchases at Gollihur Music. (NJ Residents pay NJ State Sales Tax of 7%.) International customers, please visit our "How to Order" Policies page for information concerning VAT and Customs Charges that may be assessed by your country and/or delivery services.
  $895.00  

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The Euphonic Audio iAMP Doubler MARK II

The New Doubler


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.

You 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 It's also had improvements made to the notch filter, and the 1/4" TRS DI output has been replaced by a proper XLR -- so no more "breakout cables" are needed to interface with the sound engineer.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 (subject to revision)...
  • Variable Phase control 0 to 180 degrees, to help with feedback and other issues
  • Variable notch filter 50-600Hz with moderately high Q, to reduce gain at a selectable frequency for feedback reduction
  • 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

Bob at a September 2008 outdoor party gig playing a Micro 300/Wizzy 10 rigThe 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.
  • Trim controls to adjust the overall level of channel one, channel two, and the DI output
  • 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
  • Effects Loop: Parallel effects loop with blend control
  • Internal (computer style) jumpers control...
    • Effects loop is inserted in
      • Channel One only
      • Channel One and Two are both affected (default)
    • choose between pre- and post-EQ for the DI output (default: set to pre-EQ)
    • choose what signal is muted by the footswitch
      • speaker output and tuner output muted
      • speaker output muted only (default)
  • 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
  • Line Voltage: 100/120 - 240v selectable by rear panel switch
  • Weight: 4.75 lb
  • Tiny internal cooling fan
  • Thermal and overload protection
  • Classy brushed aluminum look chassis with black and red artwork
  • Plus the Doubler-specific features:
    • Variable Phase control 0 to 180 degrees, to help with feedback and other issues
    • Variable notch filter, to reduce gain at a selectable frequency for feedback reduction
    • XLR (balanced low impedance) input for microphone or other devices
    • Switchable phantom power (48v) for the XLR input


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.


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:
   HIGH PASS FILTERS: getting rid of the mud and rumble

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Some of our customers have told us what they think about this product.
Check out what they had to say!
Hi Everyone at Gollihur music.. You guys are Fantastic! I placed my order for an EA Doubler on the 25th May and recieved it in Sydney Australia TODAY (June 1).... I plugged it in and it is all I could have hoped for....A sweet musical sounding amp with great EQ and all the facillities I could want! Your service and the product are Fantastic. All the Bass to you!
Hugh F
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.
Neal Wilson 4/9/10
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.
Mark P (Via Facebook, Sept 2010)
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)
Pat G (December 2012)