Home  Donate  New  Search  Gallery  Reviews  How-To  Books  Links  Workshops  About  Contact

Musical Fidelity V90-DAC
USB, Coax & TOSLINK D/A converter
© 2013 KenRockwell.com. All rights reserved.

Intro   Specifications   Measurements   Sound  Recommendations

Please help KenRockwell..com

Musical Fidelity V90-DAC

Musical Fidelity V90-DAC (needs 12 V DC wall-wart, 21.0 oz./596 g, about $300). enlarge. I'd get it it at Amazon. This free website's biggest source of support is when you use that or any of these links when you get anything, regardless of the country in which you live — but I receive nothing for my efforts if you buy elsewhere. I'm not NPR; I get no government hand-outs and run no pledge drives to support my research, so please always use any of these links for the best prices and service whenever you get anything. Thanks for helping me help you! Ken.

Musical Fidelity V90-DAC

Musical Fidelity V90-DAC. enlarge.

 

July 2013   Musical Fidelity reviews    audio reviews    all reviews

Digital Inputs: 1 USB, 1 Coaxial and 2 TOSLINK.

Analog Outputs: Unbalanced RCA pair.

Power: Tiny 12V DC wall-wart. 100-240V, 50-60 Hz, non-polarized 2-blade USA plug.

Notable: Solid mechanical construction. No bothersome controls or options; just plug-and-play.

Missing: No other controls. No analog inputs or digital outputs. No headphone jack or volume controls. No AES digital inputs or outputs. Not USB powered; always needs wall power.

Musical Fidelity V90-DAC

Bottom, Musical Fidelity V90-DAC. enlarge.

 

Musical Fidelity V90-DAC

Wall wart and Musical Fidelity V90-DAC. enlarge.

 

Musical Fidelity V90-DAC

Musical Fidelity V90-DAC and The Planets. enlarge.

 

Introduction         top

Intro   Specifications   Measurements   Sound  Recommendations

Adorama pays top dollar for your used gear.

B&H Photo - Video - Pro Audio
I use these stores. I can't vouch for ads below.

The Musical Fidelity V90-DAC is a very well made and very basic digital-to-analog converter (DAC). It's a simple utility DAC with a power switch and input selector, and that's it. Plug it in and you're done; there are no menus, no filter selectors, no volume controls, no headphone jacks and nothing else but the music.

The V90-DAC is a queer size, an inch less than half-rack wide with a faceplate a fraction of a millimeter taller than 1 RU. Clearly not for studio use, its odd size and building-block simplicity suggests this is a DAC ideal for tucking away behind the rest of your equipment.

Its case is sheet metal and its faceplate is aluminum. The toggle switches are metal. The feet are hard plastic, so it slides around.

The power switch is upside-down (down is ON), and the input switch has three clicks. Perfect! There is a tiny blue POWER LED and a green LOCK LED, and that's it for the front panel. The markings are all painted, not engraved.

It's made in Taiwan, which costs its maker about three times as much as dumping its production to China, as too many once great brands do today. It's in a tougher case with much better feeling controls than Chinese DACs like the Cambridge DacMagic Plus and Audio Engine D2, each of which cost twice as much as this V90-DAC.

It's powered by a tiny included 12 V DC wall wart. The included wart is a tiny switching supply that runs universally from 100-240 V, 50-60 Hz. Mine has a two-blade (non-polarized USA) plug. The 12 V DC input is a coaxial socket, but of a smaller (3.5mm) diameter than standard 12 V plugs.

I love that the V90-DAC has a real input toggle switch. I HATE crappy Chinese DACs with idiotic pushbuttons and LEDs that require many pushes to try to select an input; with the V90, just flip the switch and you're done.

It's more toughly made and is much simpler than the Cambridge DacMagic Plus or Audio Engine D2 and it sounds at least as good, but the V90 tests poorer than either — or the superb iPhone 5 — if you care about measurements.

 

Specifications         top

Intro   Specifications   Measurements   Sound  Recommendations

 

DAC

"32 bits."

Upsampled to 192 ksps.

 

Input

TOSLINK.

Coaxial RCA.

USB to 24 bits, 96 ksps, asynchronous.

 

Output

2.2 V.

47Ω source impedance.

 

THD

0.0004% (-108 dB), 20 - 20,000 Hz.

 

Crosstalk

-104 dB, 20 - 20,000 Hz.

 

Signal to Noise Ratio

117 dB, A-weighted.

 

Jitter

12 ps total.

 

Power

12 V DC, 500 mA.

Rated 1.3mm (?I.D.), measured 3.5mm O.D. plug.

Won't run from USB power.

 

Quality

Made in Taiwan.

 

Environmental

5-45º C.

10 - 90% RH, noncondensing.

 

Size

102 x 170 x 47 mm, DWH.

4 x 6-2/3 x 1-2/3 inches, DWH. Yes, the specifications read in thirds of inches.

Depth includes connectors and switches.

Height includes feet.

 

Weight

21.025 oz./596.0 g,

12 DVC adapter 1.950 oz. (55.2g).

Musical Fidelity rates it as 24 oz. (600 g), or 40 oz. (1,100 g) for the complete system packed in carton.

 

Included

V90-DAC in a nice box.

Power wart.

Instruction sheet.

 

Announced

28 May 2013.

 

Available since

July 2013.

 

Price, USA

$300, July 2013.

 

Measurements         top

Intro   Specifications   Measurements   Sound  Recommendations

Output Levels  Channel Balance    Output Impedance

Output Noise   SNR   Frequency Response   THD    SINAD   

Output Spectra    Low-Level Linearity   Jitter Rejection

 

These measurements were made with a $50,000 Rohde & Schwarz UPL laboratory analyzer. The traces from the Rohde & Schwarz UPL laboratory analyzer are color coded for the Left Channel and for the Right Channel. When they don't lie on top of each other, it's due to channel imbalance.

Unless otherwise specified. all measurements are made with a coaxial digital input from the UPL at 44.1 ksps, 1.0 V P-P with 24 undithered bits at 1 kHz at 0 dBFS. The DAC's output was loaded with 200 kΩ in parallel with 400 pF. I saw no difference in in self-jitter or jitter rejection or anything regardless of if I used the TOSLINK or coaxial input.

 

Output Level     measurements        top

2.1932 V RMS (+6.822 dBV), which is 9.66% or 0.801 dB above the standard, so this DAC will sound just a tiny bit louder than a standard DAC, SACD or CD player.

 

Channel Balance     measurements        top

0.03 dB channel imbalance, which is audibly perfect.

(2.1968 V RMS (+6.834 dBV) left, 2.1896 V (+6.807 dBV) RMS right.)

 

Output Source Impedance     measurements        top

Actual output source impedance: 101 Ω.

(300 Ω load drops level 2.5227 dB /2.5247 dB; R source = (R load/attenuation ratio) - R load.)

 

Output Noise    measurements        top

Playing zeros, AC coupled from 1 Hz:

-108.7 dBV A-weighted.

-106.14 dBV unweighted.

 

Signal to Noise Ratio (SNR)     measurements        top

With a 0 DBFS output of +6.822 dBV, this calculates as:

-115.5 dB A-weighted SNR (18.9 effective bits).

-113.0 dB unweighted SNR (18.5 effective bits).

 

Output DC Offset     measurements        top

-228 µV left, -250.3 µV right.

No problems here.

 

Signal to Noise + Distortion (SINAD)     measurements        top

96.76 dB left, 93.23 dB right.

(15.8 effective bits left, 15.0 bits right).

 

Frequency Response     measurements        top

Musical Fidelity V90-DAC THD

Musical Fidelity V90-DAC frequency response. (R&S UPL source.)

It's a third of a decibel low at 20 kHz. This deficiency is probably deliberate, as it may ever so slightly smooth the sound compared to a more accurate DAC, but it doesn't meet its specification of ±0.1 dB.

I measured the same frequency response at 55 ksps, and it was also unchanged with a reduced 134 pF instead of a 400 pF load; so it's most likely an internal filter artifact and not a cable-driving artifact.

 

THD: 0.002% (-94 dB)     measurements        top

Measured THD (harmonics only) rises above -17 dBFS, so it never measures that well, but it's still about 40 dB below audibility. It's as good as my iPhone 5, which tests better than most "audiophile" DACs.

Musical Fidelity V90-DAC THD

THD versus level from -70 dBFS to 0 dBFS, 22kHz bandwidth. (R&S UPL.)

 

Musical Fidelity V90-DAC THD

Harmonic components, 1kHz at 0 dBFS. (R&S UPL source.)

At full scale, it's mostly benign second harmonic distortion

 

Musical Fidelity V90-DAC THD

Harmonic components, 1kHz at -20 dBFS. (R&S UPL source.)

At -20 dBFS, it's the usual distortion.

 

Musical Fidelity V90-DAC THD

Harmonic components, 1kHz at -40 dBFS. (R&S UPL source.)

Likewise, at -40 dBFS, it's the usual distortion.

 

Musical Fidelity V90-DAC THD

THD at 0 dBFS (2.2V RMS), 22kHz measurement bandwidth. (R&S UPL.)

Whatever is raising the distortion. at full output is doing it without regard to frequency. Since it's mostly second harmonic, as any engineer can see by the fact that the curve doesn't notch down as we approach 10 kHz and the 22 kHz measurement cutoff, I'll bet you something isn't completely symmetrical about whatever power supply is working from a single-ended 12 V DC wall-wart.

 

Musical Fidelity V90-DAC THD

THD at -20 dBFS (220 mV), 22kHz measurement bandwidth. (R&S UPL.)

At -20 dBFS, it's beautiful. Too bad it can't dish this out at full output.

 

Musical Fidelity V90-DAC THD

THD at -40 dBFS (22 mV), 22kHz measurement bandwidth. (R&S UPL.)

Not bad for -40 dBFS.

 

Musical Fidelity V90-DAC THD

THD at -60 dBFS (2.2 mV), 22kHz measurement bandwidth. (R&S UPL.)

This is fine for -60 dBFS; this is mostly noise.

 

Output Spectra     measurements        top

10 kHz Sine Wave, Narrowband FFT (self-jitter test)

DacMagic Jitter

Output spectrum, TOSLINK input from R&S UPL. (Coax input was the same.)

This is poor; my iPhone 5 is 42 dB cleaner playing an ALC file coded from my 16-bit 1984 test CD than this DAC playing a freshly-generated 24-bit signal. You won't hear this, but it shouldn't have these close-in spikes. I popped my Benchmark DAC1 HDR in to reality-check my lab setup; it was as clean as always.

You'll never hear this, but it shows that it's not as good as pricier American-made DACs. These spikes are so close-in (the whole trace only covers ±200 Hz at 10 kHz) that they are completely inaudible.

 

Low-Level Linearity: Superb     measurements        top

The Musical Fidelity V90-DAC is better than the Benchmark DAC1 HDR, but not quite as good as the Cambridge DAC magic plus.

No big deal; even I can't hear a half a dB at -120 dBFS (-120 dBFS is completely below the threshold of hearing unless you're playing your music at 120 dB SPL peak, which is the threshold of pain.)

Musical Fidelity V90-DAC linearity

1 kHz level error versus digital modulation level, -120 ~ 0 dBFS. (R&S UPL.)

 

Jitter Rejection: Superb    measurements        top

Musical Fidelity V90-DAC THD

20 kHz signal with 0.1 UI of jitter added at 19 kHz as generated by the R&S UPL.

This is perfect. If jitter was affecting the audio output, you'd see a spike at 1 kHz. The tits around 4.5 kHz, 5.5 kHz and 15kHz are artifacts of my test setup; they are there with or without jitter.

 

Sound         top

Intro   Specifications   Measurements   Sound  Recommendations

The V90-DAC's sound is as expected: neutral.

It's output is just slightly louder than a standard DAC or disc player (0.8 dB hotter), so to most non-professional listeners it will sound a bit bigger, fuller and better than other DACs, but that's just because it's louder — not actually better. The difference is so subtle that consumers aren't likely to hear the level difference as a level difference.

This slight level boost is clever, because it's so slight that the impressionable listener won't detect it as louder. It's so slight that it will subtly improve subjective things, making a very impressive A/B comparison to the innocent.

I fed the coaxial output of one of my reference Sony SCD-XA777ES players into the V90-DAC, and then A/B'ed the analog output of the reference player with the output of this inexpensive DAC. The SCD-XA777ES has a standard output level, while this V90-DAC is 0.8 dB hotter.

As expected, the sound is the same between the two DACs, except for the slightly hotter level of the V90-DAC. Casual audiophiles will imagine all sorts of sonic subtleties which are just the result of the slight level shift.

If a DAC has any sort of sonic coloration, it's broken. This DAC is fine.

 

Recommendations         top

Intro   Specifications   Measurements   Sound  Recommendations

DACs shouldn't have any sound or character to them; if they do, they're broken. This V90-DAC sounds like whatever you put into it, which is exactly what it's supposed to do. I saw no difference in output quality regardless of the input used.

As a basic building-block DAC used as part of a much larger system, I really like its solid construction quality compared to other more expensive DACs. This V90-DAC is much better made than many other DACs that cost twice as much; it doesn't feel like a toy as so many of them do, and it sounds just as good.

Sonically, its ample output lets it sound as good or better than many other DACs when A/B' ed, even if the sound really is the same.

As measured, its output is not quite as good as a much more expensive DAC (or as good as the superb analog output of an iPhone 5 whose output section is better than most "audiophile" products; don't confuse it with an ordinary cell phone! ), so I wouldn't go out of my way to buy one of these simply to replace the analog output of an existing player; it won't change anything except offer a little more level.

Don't worry about my measurements, nothing I measured is audibly different than the other DACs to which I compared it. I have to make some excruciatingly precise measurements to show the minor differences, none of which is audible in the levels I've measured here.

I've only compared it to DACs that sell for at least twice as much, and it sounds just as good. I've even had DACs I refused to review here that sold for over five times as much that sounded worse!

For $300, this is a very competent and well-made DAC.

 

Help me help you         top

I support my growing family through this website, as crazy as it might seem.

The biggest help is when you use any of these links when you get anything, regardless of the country in which you live. It costs you nothing, and is this site's, and thus my family's, biggest source of support. These places have the best prices and service, which is why I've used them since before this website existed. I recommend them all personally.

If you find this page as helpful as a book you might have had to buy or a workshop you may have had to take, feel free to help me continue helping everyone.

If you've gotten your gear through one of my links or helped otherwise, you're family. It's great people like you who allow me to keep adding to this site full-time. Thanks!

If you haven't helped yet, please do, and consider helping me with a gift of $5.00.

As this page is copyrighted and formally registered, it is unlawful to make copies, especially in the form of printouts for personal use. If you wish to make a printout for personal use, you are granted one-time permission only if you PayPal me $5.00 per printout or part thereof. Thank you!

 

Thanks for reading!

 

 

Mr. & Mrs. Ken Rockwell, Ryan and Katie.

 

Home  Donate  New  Search  Gallery  Reviews  How-To  Books  Links  Workshops  About  Contact