論壇 › DIY分享 › DIY雙十仔: P.16 update

djaddy 發表於 2010-5-6 23:35

Djaddy Hing 實木係咪好貴架
minimoai 發表於 2010-5-6 21:46 http://www.post76.com/discuss/images/common/back.gif

~ 1K each lor.

fuman0123 發表於 2010-5-6 23:39

簡直係高手中高手{:6_168:}

Big_McIn 發表於 2010-5-7 01:19

本帖最後由 Big_McIn 於 2010-5-7 01:21 編輯

I ordered this.
djaddy 發表於 2010-5-6 23:04 http://www.post76.com/discuss/images/common/back.gif

Class AB vs Class D for Sub, which one is better, djaddy Hing?

djaddy 發表於 2010-5-7 05:39

Class AB vs Class D for Sub, which one is better, djaddy Hing?
Big_McIn 發表於 2010-5-7 01:19 http://www.post76.com/discuss/images/common/back.gif

I vote class D, bro.

Before these higher quality designs existed an earlier use of Class D amplifiers and prolific area of application was high-powered, subwoofer amplifiers in cars. Because subwoofers are generally limited to a bandwidth of no higher than 150 Hz, the switching speed for the amplifier does not have to be as high as for a full range amplifier. The drawback with Class D designs being used to power subwoofers is that their output filters (typically inductors that convert the pulse width signal back into an analogue waveform) lower the damping factor of the amplifier.

This means that the amplifier cannot prevent the subwoofer's reactive nature from lessening the impact of low bass sounds (as explained in the feedback part of the Class AB section). Class D amplifiers for driving subwoofers are relatively inexpensive, in comparison to Class AB amplifiers. A 1000 watt Class D subwoofer amplifier that can operate at about 80% to 95% efficiency costs about $250 USD, much less than a Class AB amplifier of this power, which would cost several thousand dollars.

http://en.wikipedia.org/wiki/Electronic_amplifier

lauho 發表於 2010-5-8 02:24

I ordered this.
djaddy 發表於 2010-5-6 23:04 http://www.post76.com/discuss/images/common/back.gif


Ching
Taobao上的這類Power AMP Board 有500W之大? {:6_141:}

lauho 發表於 2010-5-8 02:34

Ching
Taobao上的這類Power AMP Board 有500W之大?
lauho 發表於 2010-5-8 02:24 http://www.post76.com/discuss/images/common/back.gif


    細心觀察過,對稱結構設計,傳統的AB類結構線路,采用BTL形式推動喇叭.
由於喇叭是低阻抗的, 可能個AMP好辛苦.(對呢方面有少少研究,說錯莫插){:6_136:}

djaddy 發表於 2010-5-8 18:33

細心觀察過,對稱結構設計,傳統的AB類結構線路,采用BTL形式推動喇叭.
由於喇叭是低阻抗的, 可能個AMP ...
lauho 發表於 2010-5-8 02:34 http://www.post76.com/discuss/images/common/back.gif


Well, Class AB is definitely too expensive to drive a sub.

djaddy 發表於 2010-5-28 12:22

本帖最後由 djaddy 於 2010-5-28 12:24 編輯

subwoofer box - under construction.

ram 發表於 2010-5-28 12:29

嘩! 其中一隻係咪送俾我?{:6_222:}{:6_175:}
Good Job!!{:6_193:}

djaddy 發表於 2010-5-28 12:32

嘩! 其中一隻係咪送俾我?
Good Job!!
ram 發表於 2010-5-28 12:29 http://www.post76.com/discuss/images/common/back.gif

You can go & make your own! I can give u the design & where to buy all the parts! {:6_183:}

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