bo: 2014

2014-12-23

Seagate USB HDD inside

Seagate Backup Plus Slim Portable Drive (STDR1000200)

2014-07-30

IPTV Set-Top Box MAG250 / MAG245 inside

http://www.infomir.eu/eng/products/iptv-stb/

MAG245

MAG250

2014-04-07

Asus Xonar Essence STX RMAA tests.

This is an RMAA audio tests of the Asus Xonar Essence STX sound card.

Asus Xonar Essence STX

Test conditions:

Windows 7 Pro SP1 x64.
RMAA version 6.4.0.
Asus MME drivers version 7.12.8.1794. 100% main output volume. 76% line output mixer volume. 100% line input mixer volume. 96 kHz PCM output.
Asus ASIO drivers version 2.0.0.07 at 24 Bit-Depth, 10 ms latency.
TRS-RCA cable line output to line input loop.
200~210 ms latency at 44.1 kHz
390~420 ms latency at 96 kHz

Test results

Frequency response 24-bit, 96 kHz

Frequency response 24-bit, 44.1 kHz

Dynamic range 24-bit, 96 kHz

Dynamic range 24-bit, 44.1 kHz

THD 24-bit, 96 kH

THD 24-bit, 44.1 kHz

IMD 24-bit, 96 kHz

IMD 24-bit, 44.1 kHz

IMD (swept freqs.) 24-bit, 96 kHz

2014-03-24

ARIETTA crossfeed filter measurements.

The "CORDA ARIETTA" headphone amplifier of the MEIER-AUDIO is equipped with a low level crossfeed filter for relaxing listening by headphones. Below are some measurements of the Meier crossfeeder.

CORDA ARIETTA

See also audio tests of the headamp here.

The graphs shows measurements like a Bauer stereophonic-to-binaural DSP (bs2b) description.

Crossfeed filter frequency response.

The frequency responses of the crossfeed filter are made by frequency analysis of white noise: one channel signal is for frequency responses of lowpass and highboost filters, mono two channels signal and independent two channels signal is for approximate stereo frequency response.

Crossfeed filter time delay response.

The time delay response of the crossfeed filter are made by analysis of one channel sinusoidal signal.

See also original description of the Meier's crossfeed http://www.meier-audio.homepage.t-online.de/crossfeed.html.

2014-03-19

MEIER-AUDIO CORDA ARIETTA headphone amplifier RMAA test report.

This is a more precise RMAA tests of the MEIER-AUDIO CORDA ARIETTA headphone amplifier are made with Asus Xonar Essence STX sound card through ASIO drivers.

CORDA ARIETTA headamp

Test conditions:

Sound card line output to amp input and amp output with volume at 2 clock to card line input.
RMAA version 6.3.0.
24 Bit-Depth, 96 kHz sample rate.
Asus drivers version 7.12.8.1794 (Xonar Essence STX).
ASIO version 2.0.0.07 at 24 Bit-Depth, 10 ms latency.
Windows 7 Pro SP1 x64.

2014-03-06

Focusrite Scarlett 2i4 RMAA test report (Balanced I/O).

Below is a RightMark Audio Analyzer (RMAA) test results of the balanced I/Os of the Focusrite Scarlett 2i4 USB sound card.

See also the early posts about viscera and unbalanced I/O tests of the Scarlett 2i4.

Focusrite Scarlett 2i4

Abbreviations and conditions:

S1 - mono; instrumental + pad mode at 11 clock gain; 3 clock monitor volume; 220 ms latency; ASIO;
S2 - stereo; instrumental + pad mode at 11 clock gain; 3 clock monitor volume; 220 ms latency; ASIO;
S3 - stereo; instrumental + pad mode at 11 clock gain; 3 clock monitor volume; 220 ms latency; MME (16-bit @ 96 kHz);
S4 - stereo; instrumental mode at 11 clock gain; 1 clock monitor volume; 220 ms latency; ASIO;
S5 - stereo; line mode at 1 clock gain; max monitor volume; 220 ms latency; ASIO;

Windows 7 x64;
Focusrite USB2.0 Win-2.5.1 Driver;
ASIO 24-bit @ 96 kHz;
MME 16-bit @ 96 kHz (only 16-bit by Focusrite MME driver supported);
RMAA 6.3.0;
Balanced TRS jack cable - #1 output to #1 input, #2 output to #2 input;

Test results

S1 - THD

S2 - THD

S2 - Stereo crosstalk

S2 - Dynamic range

S2 - IMD

2014-01-24

Focusrite Scarlett 2i4 RMAA test report.

Below is a RightMark Audio Analyzer (RMAA) test results of the "2 in / 4 out USB audio interface for musicians and digital DJs...".

See also a new post about balanced I/O tests of the Scarlett 2i4.

Focusrite Scarlett 2i4

Abbreviations and conditions:

S2i4-l - unbalanced #3 and #4 outputs looped to #1 and #2 inputs in the line mode with TS jacks; ~70% gain; 40 ms latency; stereo;
S2i4-lm - unbalanced #3 output looped to #1 input in the line mode with TS jack; ~70% gain; 40 ms latency; mono;
S2i4-lp - unbalanced #3 and #4 outputs looped to #1 and #2 inputs in the line + pad mode with TS jacks; ~80% gain; 220 ms latency; stereo;
S2i4-lpm - unbalanced #3 output looped to #1 input in the line + pad mode with TS jack; ~80% gain; 220 ms latency; mono;
S2i4-ip - unbalanced #3 and #4 outputs looped to #1 and #2 inputs in the instrument + pad mode with TS jacks; ~55% gain; 220 ms latency; stereo;
S2i4-ipm - unbalanced #3 output looped to #1 input in the instrument + pad mode with TS jack; ~55% gain; 220 ms latency; mono;
S2i4-bipm - balanced #1 output by ~80% monitor volume pot looped to #1 input in the instrument + pad mode with TRS jacks; ~40% gain; 220 ms latency; mono;