+4dBv or -10dBu?

[silent_fish]

不尽然， 我在用HUGO的SPL前级， 音源是DAC2, 耳机是AKG501，声音调到７，８点钟位置,换成＋４，声音变薄，动态不好，换成－１０就正常了.

我怀疑dac2和wyred stp se的搭配，是同一个问题

[silent_fish]

汗，刚才捣鼓了半天，以为ProAc的高音烧了，原来公房设到MONO，没想到设到MONO，高音全没了？？？Why !!!

拿AKG做参考，两者的声音非常类似，这说明系统平衡没有大问题。可能以前太习惯中频的夸张了。

在HMV试听的新款AKG也非常好，深海塞尔好像是另外一种风格

[silent_fish]

作者: hugoo

DAC2不是专业器材吗，SPL也是专业，专业对专业应该是+4才对，越来越糊涂了。
我现在接Apogee的解码进W4S前级，一个专业的，一个民用的，什么也没动，就这么接上去也没听出有什么问题。

这东西对我这种不懂技术太深奥了。

没有其他解释了，DAC２的输出阻抗是５０欧，够底吧

[silent_fish]

有道理，不过我听耳机的时候，主音量旋钮是打到最小的，应该主音量只是控制喇叭

[silent_fish]

You could be right.

DAC2 has four different output level, adjusted by a rotary switch on back panel.

DC coupled, short circuit proofed output circuitry, Output impedance: 50 Ohm
+17 dBu (5.48Vrms) with a 0dBFS sinewave input
+11 dBu (2.74Vrms) with a 0dBFS sinewave input
+7.2 dBu (1.78Vrms) with a 0dBFS sinewave input
+4.8 dBu (1.35Vrms) with a 0dBFS sinewave input

I believe I am using +4.8dBu, can double check.

Looks SPL has max input level of 21.3dBu, how do I understand this? if set to -10dBu, which one should be the max input level?

[silent_fish]

作者: sgyyz

我的，
rDac output impedance: < 5 ohm
Creek integrated input impedance: 47 kOhm

以为rDac的output impedance是错了（太低了），email ARCAM，工程部回说的确是少过5 ohm。

This is really low

[silent_fish]

They are just voltage in different scale(log), but how does it explain the max input level of 21.3 dBu.

[silent_fish]

My understanding is:

I think 21.3dBu is max non-distortion voltage (9v) for the input of SPL

Under 9v, if input level and output level doesn't match, it simply means volume pot doesn't work in a optimized way(either too loud or too soft).

Many hi-fi review said the higher the voltage, the better the sound.

Even if I use max DAC2 output(5.48v), it's still in the working zone of SPL preamp, it's just the volume control won't work well with my amp, input sensitivity for the kwa-150 is less than 1V, the SPL will have to do a lot of attenuation.

[silent_fish]

Since the source is still +4dBu, SPL is simply expecting +4dBu as max input level, I don't think there is an improvement. Unless there is difference in audio quality while SPL is doing attenuation.

I think tt's better for source have higher voltage output.

[silent_fish]

谢谢,回答得很专业,很详尽

[silent_fish]

I don't know your stp -se is passive, what kind of passive technology (transformer, resistors, others) it uses?