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  • Boostaroo R234 Revolution Headphone Amplifier and Sound Enhancer (Discontinued by Manufacturer)
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Boostaroo R234 Revolution Headphone Amplifier and Sound Enhancer (Discontinued by Manufacturer)


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  • Output - Up to 32 mW per channel, 2 channels driven, distortion normally less than 1% with reasonable quality headphones
  • Input - Impedance 5K ohms 1Khz, 2.6 volt max input for no more than 1% distortion
  • Battery life estimated at 40 hours, input must be unplugged when not in use to conserve battery life
  • 2 AAAA cells are required, use of alkaline batteries is suggested for longer playing time
  • Dimensions - 4.3 x 0.875 x 0.832 inch
1 new from $19.99


Technical Details

  • Brand Name: Upbeat Audio
  • Model: R234W
  • Item Package Quantity: 1

Product Details

  • Product Dimensions: 9.5 x 6 x 1 inches ; 3.8 ounces
  • Shipping Weight: 1 pounds
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0007NIOK8
  • Item model number: R234W
  • Batteries 2 AAAA batteries required. (included)
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (44 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: July 7, 2004

Product Description

Amazon.com

If your portable audio player uses headphones or mini-speakers, you'll want to check out the Boostaroo Revolution R234-2 High Definition Amplifier and Splitter. This small, pocket-sized can increase the volume of your audio player by up to 40 percent. The Boostaroo Revolution is a great and economical way to increase the volume of your own portable player through your headphones or mini-speakers, or share your music with up to two additional listeners. Best of all, the Boostaroo Revolution can take all three headphones at once without any noticeable difference in output or frequency response. This means that everyone will have access to the same high-performance music without any loss of quality. And at only three ounces, the Boostaroo Revolution is certain to become your companion wherever your music takes you.

Product Description

Battery-Operated Pocket Amp & Splitter Expands Compressed Digital Audio Into Dynamic Surround Sound 4 Times The Volume Designed For High-End Headphones 60? & 300? 2-Way Splitter For Sharing With 2 Headphones Or Computer Speakers Versatile Use With All Portable Electronics Mp3 Cd Dvd Video Games Laptop Tv & Satellite Radio Gives Needed Power Boost To Fm Transmitters For Surround Sound Imaging In A Vehicle White

Customer Questions & Answers

Customer Reviews

I guess I should have known as much.
Sakeeq
Makes the sound better without having to put up the volume all the way.
Oliver S. Villanueva
This little unit does a pretty darned good job.
Tom Millhollon

Most Helpful Customer Reviews

34 of 37 people found the following review helpful By Meryl K. Evans on November 9, 2005
Before I plugged in to my iPod, I had the iPod volume at about 75%. With Revolution, the volume is at 30% leaving me with plenty of room to make it louder if needed. Also, due to the volume being lower, the Revolution extends the battery life of the audio device.

Revolution looks like a white rectangle box with nothing but a couple of holes for the jacks and two AAAA batteries (that's not a typo). The package also includes two patch cords: one is three and the other is six inches long. When the jack is plugged in, the LED power indicator light comes on so you know it's in use. It's designed for use with high-end (60 ohm+) headphones. Anything less than that can't handle the Revolution's power.

The technology provides the listener with a surround sound feel, like being in a quality concert hall. The device weighs six ounces and comes in white, black, silver, and black/silver.

To use it, simply plug your headphones into the top of the Revolution. Then take one of the Revolution jacks and plug it into the side of the Revolution with the other end plugged into the audio player. If another person wants to connect, then plug the headphones into the other open jack.

Users who have attempted to share audio find using a splitter sacrifices the sound and quality. Revolution doesn't have this problem as each listener can hear as well as they would if they weren't sharing. Travelers can stop straining to hear portable devices in an airplane, gym, or other noisy setting. The device also adds power to cheaper headphones, but remember the headphones need to be able to handle 60 ohm+.

Its battery door feels fragile - like it could break while I was putting the door back on.
Read more ›
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26 of 30 people found the following review helpful By Justin Keller on September 13, 2006
I'm new in the world of headphone amplifiers, but not to headphones. I purchased this amp as an upgrade from my Boostaroo Portable headphone amp, with which I was very pleased. It excited the audio and I got to really explore some songs that were previously muddy.

However, after three days of using the Revolution, I went back to using the lower-end version. The Revolution seems like it took my sound a step back. It exploited all the digital flaws in my MP3s, overdrove certain levels in my lossless audio files, and added a significant amount of hiss to my headphones (btw, I use a pair of Shure E4c's, which I love) and made the desktop speakers I ran though it sound like they were vomiting. No amount of tweaking the EQ would help, nor would adjusting audio levels. I must say, I was pretty bummed that it didn't sound better because it has a very nice form factor. On my way home, I was imagining different ways that I could attatch it to the strap of my bag when I walk to work so that it could double as a cord manager.

I must concede though, that there were two or three tracks out of the hundreds I listened to that sounded pretty good, but those few experiences didn't outweigh those that they ruined.

If you want a cheap headphone amplifier, go with the cheaper Boostaroo, or do as I'm going to do and get a higher quality headphone amp.
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10 of 10 people found the following review helpful By Oliver S. Villanueva on January 24, 2008
This is a great little gizmo for anyone looking to boost up the music of their portable devices. It does exactly as advertised. Makes the sound better without having to put up the volume all the way.

This is what I used it with:

Media Player: Archos 605 80GB wifi
Headphones: Sharper Image Quiet Place FJ453, which I then will be using it with Grado SR-80s

As I mentioned, there are a few caveats to this:

- The battery cover is HARD to take off with just your hands. I recommend using a flathead screwdriver or something similar.

- The batteries. This uses AAAA batteries. Yes, that isn't a typo. There are such things as AAAA batteries. They aren't as readily available as AAs and AAAs, but I've heard you can purchase them at Staples and other office stores. I bought packs of them from ebay for cheap.

- These only work with Higher-end phones. Some people have complained of a white noise/feedback sound. If you use lower-grade phones, you will hear this noise. This is when you have to use the original boostaroo. Upbeat audio has created a list of which headphones are suited for each of their devices [...]

In conclusion, I recommend this only if you have high-end headphones and don't mind AAAA batteries
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17 of 19 people found the following review helpful By P.K. Lipson on September 16, 2006
As a former reviewer has written, the hiss in this amp is noticible right away, which in itself renders it useless. There is also the added dimension of a not so comfortable headahce, which apparently resuts from a frequency emmited, or just general electricity. My player works fine without the amp, that's how I know.
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4 of 4 people found the following review helpful By Amazon Customer on January 16, 2008
Verified Purchase
I'm using high end Etymotic ER4P earphones (27ohms), and a Treo mp3 player running PocketTunes. This amp is amazing. It not only boosts the volume but notably increases the bass as well. In the past the EQ on my player was kind of useless, but now with this amp I can really use the EQ and dial in the sound just how I like it. The amp seems to slightly muffle the sound a bit, but my music is overall warmer sounding now. Basically it reminds me of the warm sound of listening to a tape, but with none of the downsides of a tape recording.
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