The New Meridian Explorer USB DAC
Head Over to Apartment Therapy Tech for a full look at this new High-resolution USB DAC.
The New Meridian Explorer USB DAC
Head Over to Apartment Therapy Tech for a full look at this new High-resolution USB DAC.
I am currently listening/evaluating the Hegel HD20 DAC. This DAC from Norway provides a preamp for directly driving power amps, or line level out to a separate input stage. Note: A specially designed coaxial input claims to corrects impedance issues normally found on digital RCA connectors. Stay tuned for a full review.
Find my most recent review of the Dragonfly DAC at Apartment Therapy Tech – Plug-in Entry Level Audio Upgrade: The Audioquest Dragonfly USB DAC
While Benchmark Media is well know for the widely popualr DAC1, they have been hard at work updating and upgrading to the new DAC2 HGC. With promised greater resolution, here are the main features:
Channel Islands Audio has been producing high quality audiophile products for over 15 years. Situated along the Pacific coast and near wine country, this small audio firm builds some unique stereo gear with clean modern case work. While always being interested in these tight industrial designs, I never had a chance to actually hear one. That all changed after I spent several days at T.H.E. Show Newport. Listening to CI Audio amps, passive preamps, and DACs was a treat and had me asking for more. Fortunately, I was able to take a closer look at one of their latest designs.
Under development for 2 years, the Transient MK II represents CI Audio’s research into USB to digital audio conversion.
Removing the hood of this converter reveals a XMOS based asynchronous USB input with low jitter clocks. This asynchronous method allows the Transient to act as the master audio (sample rate) clock for your computer audio. By using two sample rate clocks all the usual suspects are available; 44.1, 48, 88.2, 96, 176.4, & 192Khz. Combined with a galvanically isolated S/PDIF on 75 ohm BNC, this USB converter provides a clean way to interface with your favorite DAC (Digital to Analog converter). It even goes further, to provide I2S outputs via 5 pin DIN and HDMI. These I2S outputs separate word clock from data stream, and a handful of Hi Fi companies have begun using this interface*. Even if you don’t use the advanced I2S outputs, the true 75 ohm BNC S/PDIF allows for correct impedance when connecting to a DAC of your choice.
With a clean modern faceplate, this unit has an industrial refinement about it. The sample rate is easily seen by one of six blue LEDs that indicate a lock. Steel hardware against the aluminium chassis provides a tasteful contrast, and the tactile feel of the precision machined volume buttons exemplify build quality. It is evident that a keen eye laid out the chassis design, for even the rubber feet and front logo have a machined inlet for their precise placement. Powering is simple – the Transient pulls direct current from your USB port, making it truly portable. Taking it a step further, the VDC-5 MK II power supply can be purchased for those wanting to squeeze out every last bit of resolution.
While the USB to Digital Audio conversion is the primary purpose, CI Audio has also included a built-in DAC (Wolfson) with RCA outputs and digital volume control**. Those neatly machined volume buttons also allow quick-setting of 2V RMS output for a proper analog level to feed your preamp. Even without a pre-amp,utilizing the built-in volume allows you to plug directly into an amplifier. This type of digital volume maintains excellent L/R channel separation, but for listening at lower levels a separate pre amp may be prefered.
Transient MK II/Listening to the USB to S/PDIF conversion
With a Macbook Pro running Itunes and Pure Music, I tried the Transient MK II as powered with DC from the USB connection. For this trial, my Crane Song Avocet was the DAC and I fed it from the Transient’s S/PDIF output. Audio MIDI setup quickly recognized the attached USB Audio device, and so did Pure Music.
Now I was ready to dive into some tunes. I decided to try the standard red book CD sample rate of 44.1. Without a hiccup, all the audio files played back. I found the CI Audio unit to present a solid digital signal that my DAC could easily decode. Listening to Beethoven symphonies conducted by Karajan was simple and musically involving. The width and depth of the concert hall was spacious and localization was very clear. Not only were these some fantastic recordings, but the Transient II transmitted the data without error. With more obvious resolution, I began recognizing the superior image stability and reverb tails with the Transient’s USB to S/PDIF conversion. Having used a variety of computer audio interfaces, the Transient MK II’s ability to transmit all the digital data started to become evident. This brings me to another point; even though some DACs can do jitter reduction (i.e. Crane Song Avocet), feeding a DAC a lower jitter signal will always result in cleaner audio reproduction – the Transient MK II uses custom sample rate clocks with less than 1 psec of Jitter.
Moving on to hi-resolution audio files (24 bit/ 88.2 and above) was a cinch. A quick change of the sample rate in Pure Music had me listening to Stevie Wonder at 96khz. The Transient MK II obediently changed sample rates with LED indication, and the music commenced. 24/96 transmitted without any issues and sounded great. Stevie Wonder’s multitracked clavinets smacked some funk with clean articulation and all the harmonic content. I even cued up some stereo 24/96 SFX I recorded and was impressed at the image stability, and clarity. The clean resolving presentation of the Transient became very obvious even when low-level SFX were played. Using the Transient for my professional audio needs was certainly a no-brainer.
But, what about upsampling standard 44.1 files? By allowing your computer/Pure Music to do the upsampling in 64 bit mode, the math can be done very accurately. This allows the Transient MK II to act as master clock for your upsampling requests. Upsampling an old Count Basie recording (Japanese transfer) proved to be quite worthwhile. Moving from 44.1 to 176.4 was a fun experiment. I for one enjoyed the sound presented this way, and felt that a smoothness was brought to the presentation. If you consider digital recordings harsh, this may be the way our ears respond to different degrees of filters present at different sample rates. With the solid master clock of the Transient MK II, you can experiment with upsampling and choose what sounds best to you.
VDC-5 MK II Power Supply
Channel Islands also offers an optional power supply that provides high current and low noise for the Transient MK II. This unit cosmetically matches the Transient, and eliminates the use of DC from your computer’s USB port. Since the Transient smoothly switches between computer power or the VDC-5 MKII, it was easy to hear the differences with and without it. Bass definition, extension, and stereo image stability were noticeably improved when using the seperate power supply. While these differences were heard by several friends, it was most impressive how well the Transient operated on USB bus power alone. Those with highly resolving stereo systems may want to consider the upgraded power supply.
As an additional feature, the Transient MK II has a built-in DAC. My friend Jin was interested, so we decided to test it out on his vintage Marantz system with Wharfedale speakers. After speaking with the designer (Dusty Vawter), I was told the Wolfson DAC has been carefully implemented to extract the best possible sound. Regardless of the DAC being a secondary feature, I thought the sound was indeed musical. Using the analog 2V RMS output into the Marantz 1090 proved to be quite lovely. More so, the presentation was clean, smooth, and involving. The tonality of instruments were natural and voices sounded equally organic. While arguments can be made for the various differences in a DAC’s sound, the one thing that stood out was that nothing stood out. No exaggeration of the audio band, just clean audio that was easy to engage and listen to for hours.
As my friend and I were trying out the Transient MK II, we decided to check out some internet radio stations. I quickly found WWOZ, my local radio station in New Orleans. Soon, we were listening to Jazz and Funk from the Crescent City! USB converter, DAC, Hi-Res audio, and discovering internet radio through my HiFi…This little device brings a world of music into your home. You’d be surprised how good some of these stations can sound when converted through the Transient MK II. Sure, these weren’t Hi-Res audio streams, but the content was never-ending – that could now play through my stereo! This was certainly icing on the cake, and hours later we were still listening to various radio stations from around the world.
With modern sleek looks and smooth operation, the Transient MK II excels at getting the most from your computer audio. The build quality and value truly makes this product stand out. Without reservation, I highly recommend looking into this superb USB converter!
The Transient MK II includes a USB cable, one BNC to RCA adapter, and a 5 year warranty. Click here for information on Channel Islands Audio.
Transient MK II – $699.00
VDC-5 MK II – $329.00
My overall impressions with the Transient MK II were very good. While I have heard DAC sections that resolve more absolute detail (and twice the price), the analog output provides even sonics with no exagerations in the audio spectrum. The quality of the analog output made it enjoyable in all the systems I tried; Luxman L-550AX, Marantz 1090, & the NAD C 725 BEE. The Transient as a pre amp into my Anthem MCA 2 was a clean & imidiate sound. My biggest impression – this device has quality and portability that I have never experienced in a compact USB converter. This device makes it easy to share your quality recordings on friends stereo systems.
The USB to S/PDIF conversion works much better, and more reliably than my Yellowtek Puc2 USB asynchronous converter. I suspect several things that are contributing to this; understanding high-speed USB 2.0 and how to fully implement it for all sample rates, XMOS, custom word clocks, galvanic isolation, and proper s/pdif impedance. All the sample rates work with no fuss!
*I2S is a digital audio connection being adopted by several audiophile manufacturers including Audio Alchemy,Perpetual Tech,Camelot, PS Audio…some Future CI Audio products will include this input connection.
**Connecting the DAC output directly to my Anthem MCA amp and Eos HX speakers was very worthwhile. The sound was quick, clean and without any added color or tone. This feature is great to compare your own line stage/pre amp to.
Source: Macbook Pro running Pure Music with a large variety of recordings and resolutions.
Amplifier: Anthem MCA-2 class A/B
Computer interface: CI Audio Transient II USB to S/PDIF converter and VDC-5 MK II (power supply)
DAC: Crane Song Avocet DAC/Monitor controller (Discrete Class A)
Power: Shunyata Hydra 2 x 2 and power cables (various: copperhead, sidewinder VTX, Hydra VTX…)
Cables: Audio Magic Sorcerer speaker cable, Excalibur II interconnect, DH labs D-75 BNC to RCA, & Wireworld starlight USB
When you think of traditional speakers you often expect a wooden box of some type with drivers arranged inside. Not so with Green Mountain Audio’s Eos HX. In fact, no wooden cabinets here, except for the lovely Cocobolo wood that surrounds the tweeter. By taking a closer look it becomes evident that unique materials were used to build this speaker. The handcrafted Eos HX from Colorado Springs, CO combines artisanal workmanship with engineering refinement.
This HiFi meets steam punk design is the brain child of designer Roy Johnson. Mr. Johnson has spent years researching and developing a full range of speakers, and the Eos HX sits at the top of his 2-way designs. Never quite satisfied, the Eos has seen three iterations: the Eos, the Eos HD, and the latest being the HX.
These speakers are full of innovation. Starting with the Q-stone cabinet material, these monitors have a unique ability to be shaped in acoustically appropriate ways while also maintaining a low self resonance. The curved shape around mid/woofer allows for the fullest dispersion of sound, and the adjustable tweeter employs wool felt discs to eliminate early cabinet reflections. Without metallic resonances, the lightweight soft dome tweeter from Seas extends beyond 30Khz. The twin ports for the woofer have been specially designed to more efficiently handle bass pressure. What you end up with is a truly tuneful bass response with an excellent percussive attack.
The heart of the Eos HX is found in its crossover circuit. Through much refinement, Roy Johnson has arrived on a crossover design (1st order) that works at achieving time-coherence across the audible frequency range. Further sonic enhancements include Marigo internal wiring and Audio Magic nano stream process for the entire crossover circuit (including internal wire and binding posts). All these combined refinements further the speaker’s ability to reproduce nuances in the music.
Spending some quality time with the Eos HX proved to be very enlightening. While the bass extension rolls off around 50 hz, these 2 way compact speakers (6 inch mid/woofer and fabric dome tweeter) produce an even and smooth marriage between tweeter and woofer. The dual ported Eos HX maintain an accurate and satisfying extension of low-end, especially in smaller listening rooms. Recordings like Count Basie to more modern pop styles of Beach House were reproduced with greater resolution than I had previously heard. Even micro details were more readily heard, but never in an overhyped way. With such a natural sound reproduction of voice and instruments, I found myself hearing much deeper into recordings. The stereo image is quite amazing for a monitor of this size.
I cannot emphasize enough the emotional quality these speakers reproduce. All the attitude and inflection of singers were heard with an obvious transparency. listening to multiple voices proved to be very revealing, localization and distinctions from singer to singer became more obvious. When I turned my attention to percussion instruments like cymbals, the articulation of attack was easy to hear and subtle differences between strikes were apparent. Cymbals have never sounded so real and fully textured. Whatever the instrument, The Eos HX have an uncanny ability to reproduce it without adding to or smearing the sound. Most importantly, these speakers produced a highly musical and involving listening experience. Without reservation, I highly recommend auditioning the Eos HX.
Further information on Green Mountain Audio can be found here.