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Old 09-22-11, 06:44 PM   #1
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Dale Rasco
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RAM DAC-AMP20 Review


MSRP: $99.99
Performance:
Feature Set:
Ergonomics:
Value:


RAM DAC-AMP 20 Review



About RAM:
RAM Electronics Industries, founded in 1977, answered the demand for high quality wire harnesses and cable assemblies used in the manufacturing and connectivity of electronic equipment and instrumentation. We offer our customers cut and stripped wire, audio and video cables, complex wire harnesses, ribbon cables, molded cables and other state of the art cables used in the amusement, electronic data processing, gaming, medical and telecommunication industries.

Customers are offered a complete line of services from the initial interconnection design to final product packaging and production. Using connectors from many major brands as AMP, Molex, FCI, JST and others supplements RAM's resource capabilities of matching process to program.

RAM has an extensive inventory of semi-automatic and fully automated crimping, wire cutting and cable handling equipment and offers one of the most complete automated IDC/Ribbon Cable termination systems, in the Northeast corridor.


Unboxing and Setup:
The packaging is what you would expect from a company like RAM. No frills, just a plain white box with the unit packed with the proper amount of internal bracing and the unit was in a plastic bag to avoid any dust particles, etc. Two things caught my eye as I took the unit out the box. First, compared to other units I have seen or used such as the NuForce uDAC-2, the RAM DAC-AMP20 is about twice the size. However; the NuForce is also only USB powered and only outputs via headphones/mini-plug as to where the AMP20 has the ability to use external stereo speakers. The second thing I noticed immediately was that the external power supply was fairly large but again; this should be somewhat expected given that the unit can power two 10 watt channels. I should mention that the unit is only dependent on the external power when using the AMP20 to power speakers, it is completely portable via USB power for the headphones similar to the uDAC-2.

As far as aesthetics go, the DAC20 looks pretty nice. My only recommendation would be for RAM to change the red collar for the headphone output to black so it blends better. Other than that I really have no complaints about the look of the unit.

As for the features; I think the connectivity options are about right for the price of the unit. The digital optical input, which is default when both the USB and optical are connected, makes it convenient to connect devices such as Blu-Ray/DVD players, TV’s with digital output and other such components and the USB connects quick and painlessly to your MAC or PC which is where most of us will end up using this unit anyway. All in all, the setup was fairly quick and painless. I had the unit setup on a Mac-Mini in about five minutes and most of that time was spent running the power so it was hidden in order to avoid any confrontations with my better half.


The DAC-AMP20 is a Digital to Analog Converter with Optical and USB Inputs, and an Amplifier with both Headphone and Speaker Outputs. Headphone output or 10 Watts per channel for connecting a pair of Stereo Speakers to your computer or any toslink digital output device. Along with the unit, RAM also includes the a copy of the test results of each unit that shows the THD and response of the unit tied to the serial number in the documentation. I thought that was a very confident thing to do and thought it should be mentioned.

Update: Scans of the test results.

THD

Signal Noise Level

Dynamic Range

Stereo Crosstalk



Update
After working with the AMP-20 and I have found some additional information that will be important to anyone seriously looking for a DAC solution. As pointed out by one of our forum members, RAM doesn't publish their specs in regard to two very important areas, but I have located the information within my Mac-mini setup and have posted directly below.
  • Maximum sampling rate: 48kHz
  • Resolution: 16-bits
DAC-AMP 20 Published Specs:
  • Supports LPCM Digital Audio, (no Bitstream support)
  • Dynamic Range: 90 dB
  • Sampling Rate: 32Hz~192KHz
  • Signal to noise Ratio: 90 dB Headphone amplifier:
  • THD: 0.03%
  • Signal to noise: 105dB
  • Power: 45mW
Amplifier Specifications:
  • Power: 10W x 2
  • THD: 0.1%
  • Signal noise 80dBAnalog:
  • Frequency range: 20Hz~20KHz
  • THD: 0.042%~1KHz
Inputs:
  • Optical fiber
  • USB
  • Outputs:
  • 32ohm 3.5mm earphone jack
  • 8 ohm Speaker Wire
  • Dimensions: 90 x 65 x 30 mm
  • Weight: 150 g.
Reference System:
  • Apple Mac-Mini
  • Asus
  • Apple TV
  • Audio Technica ATH500
  • Polk TL2
Subjective Listening:

From the PC via USB:
After playing around with the options for a bit it was time to sit back and do some real listening. I started off with Fates Warning's 'The Eleventh Hour'. The song is a great piece for listening through some headphones and really losing yourself in the mood of the song. Jim Matheos' writing ability is absolutely phenomenal, but it is also a bit of an acquired taste. All of the different emotions in the song come across with clarity and authority. From the despondent feeling of the first two versus to the angry transition to the bridge and back again I really felt like the recipient of the songs message.

Ok, so enough of the depressing stuff; time for an upturn. Of course one of my favorite reference pieces is Clint Mansell and the London Music Works ‘Requiem for a Tower’. Blasting through the Audio Technica’s, thanks Dave, I really felt the energy of the song build and then soar only to crash and re-build. It was an awesome to experience the piece alone in my own little world where I really felt like I was detached from everything.

Next on the list was the song ‘Crying’ by Yngwie J. Malmsteen from his 1986 album ‘Trilogy’. This is one of my all-time favorite instrumental songs for several reasons. First and foremost I think it let everyone know that just because you don’t play your guitar slow, doesn’t mean you don’t play with feeling. Second because the song itself has several different textures of guitar that need to be heard to be appreciated.; the slow fingerpicking of the steel string acoustic and the fast staccato finger picking of the nylon string at the beginning of the song progress to a complimentary melodic rhythm before eventually giving way to a blistering electric guitar solo to finish out the song. That one always gives me chills…

From the Apple TV via Toslink:
For the optical input test I used the Apple TV and a combination of speakers attached to the DAC, the Audio Technica ATH-500’s and plugged directly to my receiver via the headphone jack mini-plug. I started with ‘Let Me Go’ by 3 Doors Down. The song is a good contemporary rock song that has plenty going on with the vocal harmonies and melody of the song that I think it offered some great listening. Each part came out very clear and the sound was full and engaging. Luckily I was going through the Polk speakers so I was less embarrassed about singing out loud, of course my bride was embarrassed enough for both of us.

Alright, it was time for something different now. I love the rock and I am all about the heavy metal, but I need to hear how clear this thing really is. I opted to listen to Andres Segovia ‘Sarabanda’ as loud as I could stand it and in the end the DAC won. I the only noise I could detect was a faint hiss of the volume just before the song started. Other than that, the song was as clear and about as perfect as I’ve ever heard. I really expected the result to be less than pleasing but in the end the unit prevailed.

The last song on my list was ‘Throwin’ it All Away’ by Zakk Wylde from the ‘Book of Shadows’ release from the late 90’s. For any of you that haven’t heard the CD, it is a bit of a departure from any of Zakk’s other material whether it be Ozzy, Pride and Glory or his band for the last 10 plus years; Black Label Society. This CD was heavily influenced by the likes of The Allman Brothers and Lynyrd Skynyrd as it has a very definite southern rock flavor and it’s a shame he only put out the one CD in this genre. The song is a great southern rock style ballad with everything from acoustic guitars, piano, violin (fiddle for the purists) and a great guitar solo. There is a lot of emotion in the song and each instrument comes out clear and full of energy.

Conclusion:
I have to say that I was pleasently surprised by the AMP20's performance. I was honestly expecting a half-hearted solution as RAM is not always at the forefront of my mind when I think of audio components however; I will definitely think about them moving forward. Don't get me wrong, the DAC-AMP20 is not for everyone, especially the crowd looking for something in the Benchmark or Music Hall line-up. But we can't all afford to shell out that kind of money and if you are looking for a solid mobile DAC that will perform consistently and give you an option to connect external speakers; then defintitely check out the DAC-AMP20. However; if you are looking for an inexpensive DAC only, then there are some better options out there that have better performance at an equal or lower cost.

For questions, comments or discussion of this review, see it in the Home Theater HiFi Audio Components forum:

Win this review unit!


Regards,
Dale Rasco




“Opportunity is missed by most people because it is dressed in overalls and looks like work." -Thomas A. Edison


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Last edited by Dale Rasco; 10-02-11 at 07:28 AM..

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