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JDS Labs, Inc cMoyBB v2.03

Headphone Amplifier with Selectable Bass Boost, Auto On/Off, and Smooth Volume Adjustment Knob


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JDS Labs, Inc cMoyBB v2.03

Headphone Amplifier with Selectable Bass Boost, Auto On/Off, and Smooth Volume Adjustment Knob


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Product Features:

  • Portable Headphone Amplifier with Exclusive Bass Boost
  • The bass boost switched can increase sound up to 9.4dB, which amounts to a doubling of the perceived sound
  • Unlike most cMoys with protoboards, JDS Labs uses printed circuit board (PCB) for clear signal transfer and minimized signal distortion
  • JDS uses only the best power instruments in order eliminate noise and poor signal transfer
  • Equipped with a DC auxiliary power input jack compatible with any regulated 9-24V adapter with 1.3mm x 3.5mm DC jack, for recharging
  • The unit can be used for listening while connected to the DC auxiliary power adapter
  • Blank mint-tin allows for complete customization and expression of personal style
  • Equipped with a standard 9V battery for reliable and easily replaceable power source
  • Aluminum tin protects electronics from EMI/RF interference
  • Volume adjustment knob does produce noise when adjusting while listening
  • Also found with a NiMH rechargeable battery

Technical Specifications:

  • Approximate Operating Time: 8-50 hrs
  • Frequency Response: 20-20,000 Hz
  • Dimensions: 0.82"W x 2.51"D x 4.56"H
  • Authorized Internet Dealer
  • 2-year Manufacturer's Warranty

Headphone Amplifier Specifications

Amplifier Style
Some headphone amplifiers are designed to be portable and others are meant to be placed on a desk. This will tell you what style of amplifier this item is.
Digital-to-Analog Converter (DAC)
A Digital-to-Analog converter (also known as a DAC) converts a digital audio signal into an analog signal. This is especially helpful for listen to music from digital sources, such as iPods and smart phones.
Frequency Response
The range of frequencies the amplifier will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
20 - 20000 Hz
Input Connection
This is the manner in which the headphone amplifiers receive an input audio signal.
3.5mm Mini-Jack
Output Connection
This is the manner in which the headphone amplifier will output the audio signal.
3.5mm Mini-Jack
Number of Outputs
Some headphone amplifiers have a built-in splitter so multiple pairs of headphones can be connected to it. The number specified here is the number of headphones that can be connected to the amplifier.
The width of the item from left to right (side-to-side) measured in inches.
The height of the item, measured from top to bottom, in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
2 years
Labor Warranty Duration
2 years
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


Alabama, US

Good, but I question the default OPAMP

November 14, 2013

As far as CMoys go, this one is a pretty good design with good components. I'm not a fan of any bass boost (I prefer neutral) but it has a switch, so I just leave it off and it's no big deal. It's still a great CMoy design regardless. I do question the use of the OPA2227 as the OPAMP that it comes with (I've always felt like it had a pretty bad sound and, ironically, not so great at bass either) but it has a socket so you can put in whatever you want (and I was going to change it anyway since I love the AD8620 the most of all personally.) I think it would be better if it came with the more well-rounded OPA2132 (which is more or less accepted as the "default" OPAMP for CMoys normally) but in my case it's no big deal -- just not everyone necessarily knows about OPAMP rolling and might not think to change it.

The pricetag definitely hurts, but it does seem to be using a good design and quality components and there aren't many better sounding designs you can find for cheaper (in fact, the alternative I was using has disappeared from the market everywhere.) There's even some sort of bipolar transistor (or something which certainly looks like one) which I'm wondering if maybe is there to help protect from reversed polarities (the bane of my existence I swear) but I don't really know enough about them to know for certain and I'm definitely not about to test. (Most CMoy designs fry more or less every component if you accidentally reverse polarity even for just a moment, so I'm not going to test, lol.)

9 of 10 found this helpful

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Great Product!

October 26, 2014

The item is of great value! It has a powerful bass that is great for watching movie. It produce great sound with Beats Solo headphone.

10 of 13 found this helpful

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Topeka, KS

Hands down, the best Cmoy!

October 6, 2013

Met all expectations and more! Mine was built with care.

5 of 7 found this helpful

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: JDS Labs, Inc cMoyBB v2.03