Channel Islands E•200S Stereo Amplifier

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Channel Islands Audio E-200S Front Panel

The last time I tried out some of Dusty Vawter’s amps I was toting two hefty monoblock amplifiers down the Pacific Coast Hwy. On this journey, my payload was significantly lighter. The E-200S stereo amplifier box fit snugly into the back of my Subaru, and once home, this small unassuming amplifier took center stage powering my 2 way speakers- Green Mountain Audio Eos HX.

Getting it out of the box, was a snap (14.0”W x 2.75”H x 10.0”D). The size and weight of this amplifier made setup and handling a breeze. While the front panel grants access to an on/off button with blue LED surround, the host of usual connections can be found on the amp’s business end. Whether you choose RCA or XLR inputs, the custom differential input stage is used. Then an updated UcD Class D stage drives the output. Speaker binding posts are insulated and accept spades or bananas, and a trigger input is also made available. Power cable plugged in, and we are off.

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200 watts per channel @ 8 ohms/ 400 watts per channel @ 4 ohms

For music, I used a Macbook Pro running iTunes/Pure Music 3. The DAC was my Crane Song Avocet, and the Antelope Audio Zodiac Platinum. With everything connected via balanced cables and several hours of warm up (this amp had already been burned-in) I was ready to start listening to some of my favorite tracks.

I cued up some acoustic music by Kings of ConvenienceThis Norwegian duo offers a great starting point to evaluate the naturalness of the male voice. Listening to “Rule My World” from “Declaration of Dependence” gave me some lovely acoustic guitars with harmonizing male vocals.

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View from above, notice the small footprint

The two part acoustic picking of “Declaration of Dependence” maintained all the midrange richness while allowing the male vocals to almost float above the gentle picking style. The clarity of guitars and male voices were presented in an un-hyped and natural way.

Moving onto more complex works, I began listening to Herbie Hancock’s “Steppin’ in It.” This groove laden funk from Mr. Hancock’s “Man-Child” album features rich synth leads, a tight bass lines from Paul Jackson, and a stellar harmonica solo by Stevie Wonder. Allowing all that musical articulation to shine through requires some control over loudspeaker movement. The E200-S gripped My Eos HX and allowed each and every bass note to come through with precision and depth. While everyone in the band holds down the groove, Herbie takes the Rhodes for a stroll… and before you know it Stevie Wonder is syncopating a harmonica unlike I’ve ever heard. With each breath, a new note even funkier than the last is pumped out. All these counter rhythms and complex instruments can be demanding on an audio amplifier, and the CI Audio E-200S never slowed down. In fact, the intricate stereo soundstage was expansive. To top it off, the tonality of instruments (even the squeaky high harmonica) never sounded dull or harsh.

To verify the neutrality, I relied on several orchestral and vocal ensemble recordings I made for NPR, all at the same performance hall. While less capable amplifiers have shown some distortions or break-up, I’m happy to report that the CI Audio amp had none of those shortcomings. Localizing mic placement, hall width/depth, and reverb decay were all amplified without coloration. This provided a sonic portal to the original recorded events, an immersive experience indeed.

Spending time with the E-200S was revealing in so many ways. From black quiet backgrounds to fully erupting orchestral performances, this little beast was in control. Most of all, this CI Audio amplifier proves that green design and audiophile sound need not be mutually exclusive.

Happy Listening

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Oyaide Electric Company; A Materials Science Approach to Power Distribution 

 

Power Distribution Parts by Oyaide Elec & Acrolink Japan

The Japanese hi-fi market exists alongside a healthy DIY audiophile scene. The Akihabara neighborhood of Tokyo is a great example. One step off the Sobu line and a world of electronics specialty stores become available for professionals and hobbyists alike. One of my favorites, Oyaide Electric shop provides cables, connectors, and parts for building your own audio, video, and power cables/distributors.

Oyaide is a long established electrical wire company that  has been in business since 1952. Over the last 30 years they have grown to develop products for the audiophile and pro audio markets. Materials for Oyaide Elect. are developed and produced in Japan with a combination of technological innovation and traditional craftsmanship.

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 P-004 Beryllium Copper no plating hand polished by traditional Japanese craftsmen

Oyaide power distribution materials are carefully auditioned and produced to provide tonal options for audio enthusiasts and professional musicians. Both the AC wall outlets and power plugs from Oyaide have been developed with several different base alloys and platings.

Their standard 15 amp Power plug and IEC connections (P-004/C-004) have become available with and without the plating of platinum and palladium. This has allowed me to listen to various power cables (Acrolink, Oyaide) and hear how they interact with different plugs and outlets- giving me a better understanding of what the AC conductors sound, which inludes: dielectric materials, shielding, plugs and ultimately the outlets they interface with.

After investigating several brass alloys, I have come to appreciate the sonic qualities of the Beryllium Copper alloy when used for AC power in highly resolving audio systems. Beryllium Copper is used for its spring like qualities combined with electrical conductivity. This alloy has corrosion resistance and maintains its original shape due to its ductile properties.

The Oyaide R0 AC duplex is made of beryllium copper for the contacts and PBT (with 30% glass) for the thermoplastic outlet face. Mechanically, the Oyaide duplexes provides excellent AC blade retention, and the PBT and glass filled body helps dissipate unwanted vibration. The R1 employs the same construction but adds a plating of platinum and palladium to the AC receptacles base alloy.

Homemade Power distribution with Oyaide MT UB Power tap case, R0 & R1 outlets

To satisfy my curiosity, I built a passive power distributor from Oyaide called the MT UB. This 2 mm thick brass and nickel/chrome plated 2 duplex box exemplifies Japanese craftsmanship. Four separate mounting poles with special washers allow each duplex to be well isolated from each other. I wired it with high-purity Japanese solid core copper and used one R0 un-plated beryllium copper duplex and one R1 plated with the platinum and palladium. I will try and describe the sonic differences of each outlet below.

Oyaide R0 duplex: This un-plated Beryllium Copper AC outlet provides an un-hyped and natural soundstage when used on analog and digital equipment. Compared to several other outlets with various metal platings, the R0 has provided me with the most neutral sonic presentation, a robust and taught distribution of power without any accent in the audio band.

Oyaide R1 duplex: Beryllium Copper plated with platinum(0.5 μ) + palladium (0.3 μ). This outlet helps create a sound of focused and refined sonic presentation. While the un-plated R0 maintains an organic flow to the music, the R1 also adds a sense of lowered noise floor with some equipment, and I found that digital gear and video (improved contrast and blacks) benefited most from the R1 outlet. While I still hear a neutral presentation (Sonically), the R1 has a highlighting or spotlighting ability, albiet subtle. 

Over the last decade I have been experimenting with various aftermarket power cables and power conditioners. Sometimes with fair results, and sometimes the cables or conditioners have effected the sound negatively. Starting with a materials based approach, I have been able to better understand how different conductors, dialectics, plugs, and  AC receptacles will effect the sound quality of professional and audiophile sound systems. Oyaide Electric company has provided a basis for AC materials to be judged in audio systems, see for yourself.

-Happy Listening

Caution: AC power distributors and cables are serious and should only be built/worked on by trained/licensed professional electricians.