Private Listening Tests

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Individual hydrogenaudio members have from time to time carried out their own private listening tests. Though individual perception of different kinds of artifacts varies from person to person, these tests provide some additional data points for comparing lossy encoders.

Single-format Tests

AAC

Date Title
Samples
Performed by Codecs Links
2004-12-09 Ahead vs Apple 128-kbps
Classical
Guruboolez iTunes 4.1.052, 4.7.042;
Nero 2.5.9.7, 2.9.998 CBR, 2.9.998 VBR
HA Thread
2005-09-05 48- & 64-kbps HE-AAC
Classical
Guruboolez CT aacPlus v.2 48- & 64-kbps
Helix 11.0.0.1897, Nero 3.2.0.20 VBR
HA Thread


MP3

Date Title
Samples
Performed by Codecs Links
2004-01-18 Dithering Test (1)
Special
Guruboolez MP3 Decoders:
MAD, LAME, Fraunhofer, foobar2000
HA Thread
2004-11-15 130-kbps LAME
rjamorim
Guruboolez LAME 3.90.3 ABR, 3.96.1 ABR, 3.96.1 VBR HA Thread
2005-01-11 128-kbps LAME
ff123
Guruboolez LAME 3.90.3, 3.96.1, 3.97a5 HA Thread
2005-10-17 LAME 3.98 -V5
Classical
Guruboolez LAME 3.98: -V5, -V5 --vbr-new,
-V5 --vbr-new --athaa-sensitivity 1
HA Thread

Notes: (1) Performed under extreme listening conditions not reproducible on daily listening.

MPC

Date Title
Samples
Performed by Codecs Links
2005-06-18 --standard
Classical
Guruboolez 1.01j, 1.15u HA Thread


Vorbis

Date Title
Samples
Performed by Codecs Links
2003-06-18 128-kbps
ff123/rjamorim
Guruboolez GT2 & PCVS HA Thread
2004-06-17 160-kbps
Special
Guruboolez CVS, GT3b2, aoTuVb2, aoTuVb2+QK HA Thread
2004-02-05 -q4
Transients
Guruboolez RC3 2002-03, RC3 2002-04, 1.01, 1.01 QK2 HA Thread


WMA

Date Title
Samples
Performed by Codecs Links
2003-06-18 128-kbps
ff123/rjamorim
Guruboolez WMA9 Standard & Pro HA Thread


Multiformat Tests

Date Title
Samples
Performed by Codecs Links
2003-10-11 130-kbps
Classical (Baroque)
Guruboolez AAC (FAAC, PsyTel, Nero, QuickTime)
MP3 LAME 3.90.3, MPC 1.14, Vorbis GT3b1, WMA9 Pro
HA Thread
2003-12-13 128-kbps
Classical
Guruboolez AAC (iTunes, Nero, FAAC),
Vorbis 1.01, WMA9, MP3 LAME 3.93.1
HA Thread
2004-07-12 175-kbps
Classical
Guruboolez Vorbis Megamix -q5,50, -q5,99 -q6,00
MP3 LAME 3.97a3 -V3, -V2, MPC -q5

HA Thread

2004-12-09 130-kbps
Classical
Guruboolez AAC Nero 2.9.9.998
Vorbis aoTuVb3

HA Thread

2005-03-05 140-kbps VBR
Classical
Guruboolez AAC Nero 3.0.0.4, Vorbis 1.1, QK28

HA Thread

2005-03-17 256-kbps Transcode from MP3
subset of ff123
Guruboolez AAC iTunes 4.7, MP3 LAME 3.97a8
MPC 1.15u, Vorbis aoTuVb3, WavPack 4.2b3 Lossy

HA Thread

2005-07-11 80-kbps
Various
Guruboolez LAME MP3, AAC-HE and -LC,
Vorbis aoTuV, WMA Std
HA Thread
2005-08-09 96-kbps
Classical & Various
Guruboolez LAME MP3, AAC,Vorbis aoTuV (Lancer), MPC, WMA Hardware.fr thread (in French)
2005-08-22 180-kbps
Classical
Guruboolez AAC, MP3, MPC, Vorbis aoTuVb4 HA Thread