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楼主 |
发表于 2007-4-2 03:18
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杂货大曝光
近日把原来用的非全铜的香蕉插换成品相较好的全铜插,没想到高频竟然黯淡下来,怕怕。现在分频器一直外置,以后内置省去的接线又不知道影响怎样。
只好再次更新分频电路,又简单测试了下,0。5米距离,125MS时间窗,还有一些房间的影响。那个1。8khz处的谷是喇叭特有的,已经尽量减少它的影响了。其实宽度只有500hz(不是很宽的),但看上去满大的(因为频域标尺不是线性的);那可不是分频频率啊,分频点在3K以上的部分,(请恕我不知道确切分频频率是多少,其实也早已没有了这个概念;因为不是用公式去计算,而是完全按照频响结果去调整元件的数值。分频点只是用来计算分频元件的手段,结果超越手段;虽然在软件分析的时候,可以清楚看见每个喇叭的频响边缘和交叠情况)此处频响受听音位置的高低影响很大,即测试位到两个喇叭中心的距离不同,相位变化明显,十分难作决断,此处经过较长时间的调整和试验。
看多了树瘤木皮,看来和原装一样的樱桃木也很好看啊。箱体是定做的,背面很保真,就差一个商标了, 呵呵。
现在不仅采用了TASCAM的专业声卡还特意购买了用于电感调校的电感电容表,虽然不是进口的也是国产最好的了。测试使用功放暂时用T-AMP。

US-122L 
USB Two-Channel Audio/MIDI Interface Links and downloads
The follow-up to our mega popular US-122, the new US-122L delivers everything you’d want in a portable audio/MIDI interface.
Record two tracks at a time and monitor them with zero latency. Whether you have a PC or a Mac, your song ideas go down in real time, real easy. Its size means you can take it anywhere you take your laptop, yet it’s packed with features that make buying it an audio no-brainer. MIDI input and output, high quality mic inputs, 96kHz/24-bit recording (better than CD quality)-all the stuff you’d want without the fluff you wouldn’t (if you need four channels and a digital SPDIF I/O, have a look at the US-144). The US-122L: the answer to your recording needs.
Main Features- Two XLR mic inputs with phantom power
- Two analogue line inputs (one switchable to high impedance for use with guitars, basses, etc.)
- One MIDI input, one MIDI output
- USB 2.0 equipped (also supports USB 1.1)
- Up to 96kHz/24-bit for high quality recordings
- Zero-latency hardware monitoring
- Headphone/level control
- Bus powered for use with any PC or Mac, including laptops
- Up to 96kHz/24-bit for high quality recordings
SpecificationsAnalogue inputs and outputsMic inputs (MIC IN L and R) XLR, balanced Input impedance 2.4 kOhm Nominal input level –58 dBu (TRIM=max) to –14 dBu (TRIM=min) Maximum input level +2 dBu (TRIM=min)Line inputs (LINE IN L and LINE/GUITAR IN R, MIC/LINE position) 6,3-mm jack, unbalanced Input impedance 10 kOhm Nominal input level –40 dBu (TRIM=max) to +4 dBu (TRIM=min) Maximum input level +20 dBu (TRIM=min)Guitar input (LINE/GUITAR IN R, GUITAR position) 6,3-mm jack, unbalanced Input impedance 1 MOhm Nominal input level –51 dBu (TRIM=max) to –7 dBu (TRIM=min) Maximum input level +9 dBu (TRIM=min)Line output (LINE OUT) RCA, unbalanced Output impedance 100 Ohm Nominal output level –10 dBV Maximum output level +6 dBVPhones output (PHONES) 6.3-mm stereo jack Maximum output power 14 mW + 14 mW (32 Ohm)Audio performanceA/D Conversion (AK5381) 24-bit/96 kHz, 27.6 samples delayD/A Conversion (AK4384) 24-bit/96 kHz, 19.3 samples delayFrequency response (LINE OUT, –10 dBV)20 Hz – 20 kHz, ±1 dB
(normal sampling rate up to 48 kHz)
20 Hz – 40 kHz, +1/–3 dB
(high sampling rate up to 96 kHz)Signal-to-noise ratio, LINE IN to LINE OUT Through ADC and DAC >96 dB(A)
(INPUT = min, input impedance 40 Ohm) Through direct monitor >100 dB(A)
(INPUT = min, input impedance 40 Ohm)Total harmonic distortion
(THD+N, 22 Hz to 22 kHz), LINE IN to LINE OUT Through ADC and DAC < 0.006%
(1 kHz sine, +20 dBu input, INPUT = min.) Through direct monitor < 0,004%
(1 kHz sine, +20 dBu input, INPUT = min.)  |
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