review33.com:影音天地:power amp係咪一定要大力?

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[#21] power amp係咪一定要大力? 視乎揚聲器效率和聆聽空間需要，另外個人口味以上三個因素而定!其實以40年代高效率劇院揚聲器在400人左右劇院劇院後級放大器Minimum power requirements只需要10瓦!當然今時今日Hi-Fi揚聲器效率其實係低咗好多倍，Power amplifier功率越高Headroom越大而爆棚時穩定程度也越高，不過制動力和力感越高，音色柔力表現反而會有反差...其實音響世界是針冇兩頭利，小弟個反而覺得在揚聲器效率和聆聽空間與及個人需要三者中間反而找個平衡更為重要! 最後修改時間: 2017-09-02 21:58:49		Pilotrol 正式會員 216.xxx.xxx.231	2017-09-02 21:57

[#22] power amp係咪一定要大力?
Boulder 2160 specifications

Epic

正式會員
223.xxx.xxx.245

2017-09-02 22:04

[#23] power amp係咪一定要大力?
That is PEAK POWER.
That can be the power at 1 second.
We need to look at Continuous Power (r.m.s.)

etsang3

正式會員
58.xxx.xxx.198

2017-09-02 22:37

[#24] power amp係咪一定要大力?
#23 x 2

From google search

2160 Stereo Power Amplifier

Output power: 600W into 8, 4, 2 ohms

Peak power: 1,200W/4 ohms, 2,400W/2 ohms

最後修改時間: 2017-09-02 22:52:44

phil.ng

會員
14.xxx.xxx.134

2017-09-02 22:51

[#25] power amp係咪一定要大力?
From ksa250 manual

That every Krell product uses Class A circuitry in all gain and supply stages is a foundation of our design philosophy. A second design commitment that relates to amplifiers is that every unit be capable of doubling its output into successively lower impedances. The KSA-150 will deliver 300 watts per channel into 4 ohms, 600 watts per channel into 2 ohms and 1,200 watts per channel into 1 ohm. The KSA-150 is fully capable of driving impedances below 1 ohm. The KSA-250 will deliver 500 watts per channel into 4 ohms, 1,000 watts per channel into 2 ohms and 2,000 watts per channel into 1 ohm. The KSA-250 is capable of driving impedances below 1 ohm.

phil.ng

會員
14.xxx.xxx.134

2017-09-02 22:56

[#26] power amp係咪一定要大力?
個人看法，講幾多Ω幾多W沒有什麼意思的，又不是玩靜電喇叭？標準以8Ω計人家易明D喎！

cat2013

正式會員
220.xxx.xxx.212

2017-09-02 23:34

[#27] power amp係咪一定要大力?
For example, 好多高檔喇叭個 impedance 個range 都幾大丶如

BW 800 D3.......由8 ohm 會落到 3 ohm, 所以 double up 都幾重要丶靚低音必需, 如果冇double up , 3 ohm 時個高音及音埸都會受影響

最後修改時間: 2017-09-03 00:01:22

phil.ng

會員
14.xxx.xxx.134

2017-09-02 23:51

[#28] power amp係咪一定要大力?
BW 800 spec

http://www.bowers-wilkins.net/Speakers/Home_Audio/800_Series_Diamond/800-D3.html

phil.ng

會員
14.xxx.xxx.134

2017-09-02 23:53

[#29] power amp係咪一定要大力?
#27
唔一定BW 800啦，一般喇叭在唱中都有Ω的變數啦！

cat2013

正式會員
220.xxx.xxx.212

2017-09-03 00:01

[#30] power amp係咪一定要大力?
#29, 8 ohm 落到 6 ohm 問題不大、range 3 - 8 就開始考機⋯推動力、控制力

phil.ng

會員
14.xxx.xxx.134

2017-09-03 00:07

[#31] power amp係咪一定要大力?
#30

所以大W機先有條件可落到1Ω了，因多管拼聯管，才能做到低Ω了，我指是粒機喎.

cat2013

正式會員
220.xxx.xxx.212

2017-09-03 01:07

[#32] power amp係咪一定要大力?
＞＞＞講幾多Ω幾多W沒有什麼意思的，又不是玩靜電喇叭？標準以8Ω計人家易明D喎！

小弟只是回應以上！除了靜電，還其他喇叭有double up 需要！

phil.ng

會員
14.xxx.xxx.134

2017-09-03 01:21

[#33] power amp係咪一定要大力?
The impedance is change dynamically, the range around 5 - 10 ohm on most of speaker.

The 8 ohm indicate that speaker impedance on 1KHz sine wave with 1 Watt power out only.

kit271

正式會員
183.xxx.xxx.73

2017-09-03 09:05

[#34] power amp係咪一定要大力?
1KHz only? This one is 64ohm