ounkchicago
100+ Head-Fier
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- Jun 28, 2007
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I've already posted initial impressions about the RP-21 in another post, but I'll recap briefly here. About 100 hours of burn-in so far, relatively neutral soundstage with tight, accurate bass, very smooth and detailed mids, but a slight inaccuracy in the treble that isn't a dealbreaker. Good isolation, initially bad comfort but is improving with each listening session as the headband is getting stretched out (decreasing clamping force over time), and build quality seems durable.
As stated in the title, this thread is concerned with how the sound of the RP-21 changes with different sources / DACs / amplification. So far, I've had the pleasure of testing the RP-21 with the following setups. They are listed in order of decreasing fidelity.
(1) Cambridge Audio Azur 640v2 CDP > Creek OBH21-SE > RP-21
(2) Apple Lossless > EMU 0404 USB > RP-21
(3) Apple Lossless out of an iMac G5 > RP-21
(4) Apple Lossless out of an iPod Nano 1G > RP-21
(5) 192 kbps Mp3 out of an iBook G4 > RP-21
Now I'll skip directly to the punchline. The surprising observation is that the overall difference in overall quality between (1) through (4) is very small. This means that, to my ears, the RP-21 do not improve much (barely noticeable difference) with amplification, and they are more forgiving of poorer quality DACs. The greatest distinction here is between any of the above setups and (5), but that's more because of the file quality than the DAC in the iBook.
My conclusion is pretty straightforward. Out of all the headphones I own, the RP-21 improves the least with amplification, and is the most forgiving of poor sources. Therefore, it is best matched with DAPs, other portable music players, or straight out of a laptop or desktop PC sound card.
I'll conclude by re-iterating the above comments in headphone rankings on various attributes. The headphones I own are: Beyer DT880, AKG 240S, Grado SR-225, Senn PX-200, and Equation RP-21.
Improvement with Amplification (Highest to Lowest)
1. Beyer DT880
2. AKG K240S
3. Grado SR-225
4. Sennheiser PX-200
5. Equation RP-21
Overall Sound Quality (my preference) using a quality DAC + headphone amp
1. Beyer DT880
2. Grado SR-225
3. Equation RP-21
4. AKG K240S
5. Sennheiser PX-200
Overall Sound Quality (my preference) out of an iPod or laptop (Apple Lossless)
1. Equation RP-21
2. Grado SR-225
3. AKG K240S
4. Beyer DT880 (just because they're underpowered)
5. Sennheiser PX_200
Comfort
1. Sennheiser PX-200 (because it's so small and light)
2. Beyer DT880 (very comfy but full sized)
3. AKG K240S (also very comfy, but closed design makes it a little hotter)
4. Equation RP-21 (reasonably comfy, but they still feel like studio monitors)
5. Grado SR-225 (stock bowls make my ears hurt after about 45 minutes)
As stated in the title, this thread is concerned with how the sound of the RP-21 changes with different sources / DACs / amplification. So far, I've had the pleasure of testing the RP-21 with the following setups. They are listed in order of decreasing fidelity.
(1) Cambridge Audio Azur 640v2 CDP > Creek OBH21-SE > RP-21
(2) Apple Lossless > EMU 0404 USB > RP-21
(3) Apple Lossless out of an iMac G5 > RP-21
(4) Apple Lossless out of an iPod Nano 1G > RP-21
(5) 192 kbps Mp3 out of an iBook G4 > RP-21
Now I'll skip directly to the punchline. The surprising observation is that the overall difference in overall quality between (1) through (4) is very small. This means that, to my ears, the RP-21 do not improve much (barely noticeable difference) with amplification, and they are more forgiving of poorer quality DACs. The greatest distinction here is between any of the above setups and (5), but that's more because of the file quality than the DAC in the iBook.
My conclusion is pretty straightforward. Out of all the headphones I own, the RP-21 improves the least with amplification, and is the most forgiving of poor sources. Therefore, it is best matched with DAPs, other portable music players, or straight out of a laptop or desktop PC sound card.
I'll conclude by re-iterating the above comments in headphone rankings on various attributes. The headphones I own are: Beyer DT880, AKG 240S, Grado SR-225, Senn PX-200, and Equation RP-21.
Improvement with Amplification (Highest to Lowest)
1. Beyer DT880
2. AKG K240S
3. Grado SR-225
4. Sennheiser PX-200
5. Equation RP-21
Overall Sound Quality (my preference) using a quality DAC + headphone amp
1. Beyer DT880
2. Grado SR-225
3. Equation RP-21
4. AKG K240S
5. Sennheiser PX-200
Overall Sound Quality (my preference) out of an iPod or laptop (Apple Lossless)
1. Equation RP-21
2. Grado SR-225
3. AKG K240S
4. Beyer DT880 (just because they're underpowered)
5. Sennheiser PX_200
Comfort
1. Sennheiser PX-200 (because it's so small and light)
2. Beyer DT880 (very comfy but full sized)
3. AKG K240S (also very comfy, but closed design makes it a little hotter)
4. Equation RP-21 (reasonably comfy, but they still feel like studio monitors)
5. Grado SR-225 (stock bowls make my ears hurt after about 45 minutes)