给你一个roland 详细参数，自己看吧：
● Number of Audio Record/Playback Channels [Sampling Frequency = 96 kHz, 48 kHz, 44.1 kHz]
Recording: 4 channels, Playback: 4 channels, [Sampling Frequency = 192 kHz] Recording:
2 channels, Playback: 2 channels
● Signal Processing PC interface: 24-bit, AD/DA Conversion: 24-bit, Internal: 40-bit
● Sampling Frequency AD/DA Conversion: 192 kHz, 96 kHz, 48 kHz, 44.1 kHz, DIGITAL (IN/OUT):
96 kHz, 48 kHz, 44.1 kHz
● Nominal Input Level Input jacks 1–2 (XLR type): -60 to -6 dBu, Input jacks 1–2 (1/4-inch TRS
phone type): -50 to +4 dBu
● Nominal Output Level OUTPUT 1–2: +0 dBu (balanced)
● Headroom 14 dB
● Input Impedance Input jacks 1–2 (XLR type): 4.8 k ohms (balanced), Input jacks 1–2 (1/4-inch
TRS phone type): 15 k ohms (balanced)
● Output Impedance OUTPUT 1–2: 2 k ohms (balanced), PHONES: 47 ohms
● Frequency Response 192.0 kHz: 20 Hz to 90 kHz (+0/-8 dB), 20 Hz to 60 kHz (+0/-2 dB),
96.0 kHz: 20 Hz to 40 kHz (+0/-2 dB), 48.0 kHz: 20 Hz to 22 kHz (+0/-2 dB), 44.1 kHz: 20 Hz to
20 kHz (+0/-2 dB)
● Residual Noise Level INPUT 1–2 MAIN OUT: -95 dBu typ. (GAIN: min., 600 ohms terminated, IHF-A)
* Internal Direct Monitor Mixer setting: Input channel fader: Unity
● Dynamic Range AD block: INPUT 1–2: 104 dB typ. (GAIN: min.), DA block: OUTPUT 1–2: 109 dB typ.
● Connectors Input jacks 1–2 (XLR type / 1/4-inch TRS phone type), XLR type (balanced / phantom
power: DC 48 V, 6 mA Max) * Current value per channel. 1/4-inch TRS phone type (balanced), Coaxial Input connector, Coaxial Output connector, Headphone jack (Stereo 1/4-inch phone type), Output jacks 1–2 (1/4-inch TRS phone type (balanced)), MIDI connectors (In, Out), USB connector
● Interface Hi-Speed USB, Digital input/output: Coaxial type (Conforms to IEC60958 consumer
format.), MIDI input/output
● Power Supply USB Bus Power
● Current Draw 480 mA
● Dimensions 184.6 (W) x 133.9 (D) x 44.3 (H) mm, 7-5/16 (W) x 5-5/16 (D) x 1-3/4 (H) inches
● Weight 0.57 kg / 1 lbs 5 oz
● Accessories Owner’s Manual, Cakewalk SONAR LE DVD-ROM (for Windows),