1. 如果部機可以由頭(CD)到尾(power amp)行真平衡制式的話, 而我則用"XLR-to-RCA" adapter 在pre-amp 去 power-amp, 請問你們會否認為這是有點浪費了全平衡的製作?



(因在我的認識, 真平衡是每聲道行2組modules, 而single-ended則是一組module! 單在制作成本上來說, "真平衡"粗略說可以是雙倍成本...)



2. 如果用"XLR-to-RCA" adapter, 你們認為是否對音色必會有重要壞影響呢? 對部只有xlr輸入和輸出的器材來說, 是否有不良影響呢?

謝謝你們!



最後修改時間: 2010-07-23 10:49:33

"真平衡"粗略說可以是雙倍成本
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If you do not use it, it is a waste of $$$. PS: your question is difficult to answer because it can be equipment specific. But in general, true balance circuitary is more quiet & dynamic.

如果用"XLR-to-RCA" adapter, 你們認為是否對音色必會有重要壞影響呢? 對部只有xlr輸入和輸出的器材來說, 是否有不良影響呢?

depend on the converter type quality, like fm acoustic may not

You should use XLR-RCA adaptor with transformer inside.

For example:

http://www.tomoca.co.jp/tomoca/mictrans/11t-rca/11t-rca.html

600 Ohm 10k Ohm

據我膚淺的認識, 所以transformer, 其實是一粒0.47的電阻...
對嗎?

加上, 圖中所見的, 都不知從何購買...

只知市面上有Cardas, Neutrick兩個牌子的adatper...

Transformer = 電阻 ???

Please take a look at the circuit diagram on:

http://www.tomoca.co.jp/tomoca/mictrans/11t-rca/11t-rca_tomoca.pdf

Neutrik also has a transformer-based adapter:

http://www.neutrik.com/us/en/audio/210_1842753590/NA2M-D2B-TX_detail.aspx

Circuit:

http://www.neutrik.com/Secure30/getMedia?encoding=ISO-8859-1&client=neutrik&saveAs=true&saveAsName=NA2M-D2B-TX.pdf&mediaPath=D:\DATA\CLIENT\neutrik\media\products\downloads\&mediaSavedName=210_1842753590.pdf&contentType=application/pdf

Balanced 比起RCA的聲是大了 6 db，而聲亦比較行，用 adapter 轉 RCA 只是 負訊號接了去地，聲音質素沒有不良影響，只是各人喜好。全平衡設計只用 RCA，當然是浪費。

If we are talking about pre-amp to power amp, many power amp will convert the incoming balanced signal to single-end before amplification any way.

So the question is whether the conversion is done better with the external adapter or the internal input circuit.

if your pre-amp is true balanced design,
why not matach with a pre-amp also true balanced design?

my line up is all single-ended....therefore very simple.

用RCA一樣可以享受全平衡效果。只要將XLR輸出之1及3接橋橋後，輸出的訊號會有更大動態及寧靜度提高。如沒有金屬橋，可接上CADAS XLR/RCA轉插便可。至於RCA線可如常接在SlNGLE-END輸出口便可。
當然輸出器材是真平衡才可。

cardas adapter最正

仆街丁滿！
收皮啦！死番去古代啦！
唔舊唔L推嘅！

最後修改時間: 2024-07-04 13:37:41

My preference is true balanced as much as possible. In case you may need to convert the balanced to RCA, I would suggest you may use a 1:2 or 1:4 interstage transformer. I use the Hammond 1:4 studio grade transformer with very good result.

Using the Cardas XLR to RCA is NOT good at all. It only takes either the +ve or -ve signal for the XLR output.

With use of interstage transformer, the +ve and -ve signal feed to the primary winding.

Johnny

最後修改時間: 2024-07-09 16:43:55

阿丁sir係咪考古學家嚟？ 咁叻發掘啲史前遺物出嚟!

I am using the Hammond 1140-LN-D 2.4K : 40K transformer.

Johnny

Here it is

Hi johnnykmtang
Did you make the converter yourself?
May I ask why such step up ratio?
That would increase the output impedance significantly (~ x270)

Yes, I made the converter myself.

The Hammond 1140-LN-D turn ratio is 1:4.

https://www.mouser.ca/datasheet/2/177/1140-1389973.pdf

When low impedance end of the transformer connects to the DAC/CD or preamp, the output impedance from the transformer would be 16 times of the input. This is perfectly OK because the input impedance of the preamp or even the power amp is rather high (25K~100K). This would be a perfect match.

It is quite confusing regarding the impedance specified by the manufacturer of the transformer. This parameter is not applicable in real application most of the time.

Johnny




最後修改時間: 2024-07-11 08:25:40