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[#1] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
如題, 現有的系統如下:
1) Speakers: MBL 311E
2) Pre-amp: Pass XP-10
3) Power-amp: Pass X250.5
現請教各位師兄, 怎樣利用以上的器材?
要配置什麼的av amp或器材或其他surround speakers?
因為av這一方面是初哥來的, 煩請各師兄提點及指教,thx!
m.tse0213
個人訊息 會員
119.xxx.xxx.119
2010-03-30 11:50
[#2] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
one way is to have a separate system. just get an av receiver and add 5 speakers plus the .1 powered subwoofer.

if you want to use your existing power amp and 2 speakers as front LR u will need your 2 channel pre amp to have home theatre bypass. then add an av receiver or pre pro with 5.1 line output, add a 3 channel power amp, a center and 2 surround speakers plus a power sub.

to have good envelope soundstage it is better to have all speakers from same brand and series. for movies a good center and a sub is paramount. if you are not into action slam and bang there is nothing wrong with just using 2 channel.

from dolby website you will notice the 5.1 set up would require your surround LR speakers to be placed a few feet behind your parallel ear level. so if you are sitting against back wall without any space behind your sweet spot u may forget about implementing properly. of course u can do it but the effects will not be optimal.



cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-30 14:48
[#3] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
其實,如果你對喇叭的低音有返咁上下, 你可以試下用2隻喇叭來睇movie. 效果一d都唔差架.
1) dvd機 output 用 digital out
2) dvd 機 digital out set去 pcm out.
3) dvd digital 去 dac 2聲度解碼
4) dac入返去你套hifi (左右)
p.s. 5.1 的聲音會合做2聲度出


草蜢仔
個人訊息 會員
79.xxx.xxx.254
2010-03-30 17:14
[#4] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
remixing 5.1 to 2.0 is incomparable to discrete 5.1 sound tracks. with blu ray 7.1 discrete lossless sound tracks u cannot enjoy with a 2.0 system

cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-30 18:02
[#5] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
部AV amp

將 AV amp 的 pre out 去 preamp (preamp 如有 bypass),如沒有,便接去 power amp 推二聲道喇叭,其餘的 3.1 /5.1 用av amp 推。
hkghuman
個人訊息 會員
61.xxx.xxx.247
2010-03-30 21:05
[#6] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
首先多謝咁多位師兄的意見及詳細的見解.
如hkghuman兄的說法,
1) 若AV Amp 有pre out的話, 就可以當作power amp 用;
2) 如没有,以hkghuman兄的方法, 就可以用番以前的pre-
amp, 有錯的話請指點, thx !
m.tse0213
個人訊息 會員
119.xxx.xxx.119
2010-03-30 23:02
[#7] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
>>若AV Amp 有pre out的話,

AV amp pre out 即是Av amp 之前級俾訊號去獨立後級,並不是當後級。若AV Amp 有pre out的話,

hkghuman
個人訊息 會員
61.xxx.xxx.247
2010-03-30 23:11
[#8] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
problem is using the pass lab x250.5 to drive front LR and receiver to drive front C and surround LR. for movies the front C and subwoofer will utilize over 60% of the time and the power amp section of the receiver will not be beefy enough to match the front LR channels.

ht is about sound effects. just have a separate system with new av receiver plus 5.1 speakers. u will be amazed by the uniform sound stage rather than going with different power amps and different speakers.

cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 08:49
[#9] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
明白了, 多謝hkghuman and cpu8088兄的分析及解答, thanks!
m.tse0213
個人訊息 會員
119.xxx.xxx.119
2010-03-31 09:29
[#10] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
lynn olson posted in positive feedback many years ago:

""After many years (decades!) of designing and listening to multichannel
systems, I've arrived at two main conclusions:

1) Multichannel systems require *better* electronics and speakers than
stereo ... in the exact same way that stereo requires better equipment
than mono.

Also, as with stereo, all of the speakers and amps must be *precisely*
matched. Unlike stereo, though, quality mismatching doesn't result in a
left/right asymmetry, but instead, a very rapid increase in "phasiness"
and fatigue. This is why so many people who use mismatched low-cost rear
speakers eventually give up on quad. Using a "logic" system to force the
localization into the mismatched speaker simply results in more listening
fatigue, not less, as frequency response, phase, and polar patterns go
through extremely rapid changes as the sound source is steered around the
room.

2) Any system that requires the user to flip through mode switches for
each type of program (mono sources, movie surround, classical, jazz, rock)
is fundamentally flawed. You don't need to do this in stereo, after all. A
correctly designed multichannel system should provide stable, accurate,
and fatigue-free localization of all possible encoding possibilities ...
mono, panpot stereo, multimike stereo, Blumlein stereo, Dynaquad, EV-4,
Ambisonic, Dolby Surround, etc.

The fundamental principle of all logic-steered systems is that they
sharpen the localization of the loudest sound and defocus the quieter
sounds, with "attack" and "release" times of the logic-steering system
carefully adjusted to be as unobtrusive as possible. Unobtrusive, though,
isn't the same as inaudible, and this kind of fool-the-listener
monkyshines can be detected when you play an ungimmicked stereo recording.
Of course, logic-steered systems always provide logic-off or "hall"
switches for this condition. This is **bogus**! It requires the user to
choose between sharp localizations and natural sound.""



cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 10:15
[#11] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
for your info (from dominic baker, the design engineer of focal jmlab utopia series):

"if your front speakers have 24db/octave slopes to get the sound clean, and your center channel has an 18db/octave slop (because it looks like a d'appolito on its side, and everyone knows 18db works best in d'appolito configurations), and your rear channels have a first-order crossover (most do because it costs less, and companies know that no-one wants to pay much for surround channels because they don't do much), the result is that you end up with a fundamental phase problem that guarantees the system will never "work" no matter how carefully you position the speakers or play around with your receiver's controls.

and you will find that we say you should not mix speakers from the cobalt range with those from the chorus range in the same system and expect a good result. but if you mix speakers from within one of our ranges, you will be amazed. put any five chorus models in a system and it will work straight away. why? because all chorus models have the same tweeter, the same midrange, the same crossover point and the same filter slopes."

cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 10:17
[#12] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
also from dominic baker on focal electra series

""Home Theater - A very Important Note

A very important thing to note regarding the Electra range, and in fact the Chorus and Cobalt ranges, with respect to Home Theater installations:

Many, high-end dealers, journalists, consumers etc, are convinced that for a true Home Theater system that it is essential to use five (or six, seven, eight. . .) identical loudspeakers. In many practical cases, they are not wrong. If the floorstanding main loudspeakers use a carefully optimized 24dB/octave crossover, the center an 18dB/octave because the designer sees it as a d’Appolito type configuration and the surrounds a simple 12dB/octave ‘cause they are just for effects and the budget is a little tight, then there is no way, even after three days of set-up with the most advanced test systems, that this system will ever deliver a stable three dimensional image as intended by original
soundtrack engineers. The difference in phase over the critical midrange/treble frequencies between the different crossover types used just won’t allow it.

It is for this reason that we go to great lengths to use the same crossover topology: – 24dB/octave for Electra, at the same crossover frequency: – 2.5kHz for Electra, with the same tweeter: - TRC for Electra, with the same midrange driver: - “W” cone for Electra FOR EVERY SINGLE ELECTRA MODEL. Even the quality of the drivers, cabinet, crossover, damping material etc is same high standard throughout the whole range.

The result is that we can promise that once installed and levels set, you will be instantly greeted by a true three dimensional image that will make your head turn. It is sad to see so many high-end systems that are simply not capable of delivering the true Surround Sound effect because of an electroacoustic short-sight. It’s a lot of money to waste, don’t make this mistake.""
cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 10:20
[#13] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
check this:

http://www.dolby.com/consumer/setup/speaker-setup-guide/index.html
cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 11:48
[#14] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
Your system is for set up for AV. Good though the MBL is for stereo it is not good for AV fearing that it will blow easily with its tweeter. It is much better to have a seperate AV system. Me too have a different system for stereo and 5.1 AV. Recommended system up is KEF KHT-9000 or KHT-3005 model. Other system could be Whatmough Synergy 3 from Australia. There subwoofer is one of the very best in the business. Some say it is better than Sunfire.
hm7734
個人訊息 會員
219.xxx.xxx.220
2010-03-31 11:50
[#15] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
KEF is the best selling AV brand in the UK as I read from Hi Fi magazine. Goto I Theatre and have a look.
hm7734
個人訊息 會員
219.xxx.xxx.220
2010-03-31 11:52
[#16] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
kef low models now assembled in china. should be good value.

cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-03-31 12:25
[#17] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
Thank you for all brothers'opinion, thanks so much.
m.tse0213
個人訊息 會員
119.xxx.xxx.119
2010-03-31 22:45
[#18] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
KEf and Celestion lower model driver assemble in China but using machine originated from UK factory so quality with be the same from UK. The factory in China is also very modern with full air-con so quality from adhesive for driver cone will be more consistant.
hm7734
個人訊息 會員
219.xxx.xxx.220
2010-04-01 01:46
[#19] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
a good read about design and placing horizontal center speaker

http://forum.blu-ray.com/speakers/89614-horizontal-center-channel-speakers-why-they-should-avoided.html
cpu8088
個人訊息 會員
115.xxx.xxx.214
2010-04-01 03:02
[#20] 請教各位師兄, 怎樣利用現有的2聲道系統轉玩av 5.1?    
買部2000年時的AV amp, 又平又有質素
aheung
個人訊息 會員
219.xxx.xxx.131
2019-10-18 08:20
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