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| [#1] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 關於擴散板: 1. 這些擴散板的效果如何呢? 應如何擺放? 2. 怎樣決定自己的聆聽環境是否需要這類擴散板呢? 3. 請問圖中的塊布膠在那裡可買到? 最平幾錢? 4. 木的, 又在那裡可買到? 最平幾錢? 5. 自己找木工師傅造, 效果如何? 關於吸音裝置: 1. 吸音裝置是否為了減少Booming? 應如何擺放? 2. 怎樣決定自己的聆聽環境是否需要吸音裝置呢? 3. 如果家中沒有boom, 是否不需要吸音呢? thanks! 借圖:  |
AV-SON 正式會員219.xxx.xxx.249 |
2010-01-04 08:46 | |
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| [#2] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 1. 這些擴散板的效果如何呢? 應如何擺放? place them at first reflections points, say left, right , front and back. but the distance between them and the listener has to be large enough for them to work, say 10 feet. for rooms in hong kong, it is not much use. 1. 吸音裝置是否為了減少Booming? 應如何擺放? 擴散板 won't help with booming. it aims at mid to high frequency. to reduce booming, you have to use bass traps. try to place them at intersection of surfaces ie corners. 2. 怎樣決定自己的聆聽環境是否需要吸音裝置呢? use your ears or do a measuremnt. 3. 如果家中沒有boom, 是否不需要吸音呢? then you are lucky. instead of booming, you might have suck out of certain frequency. if you low frequency response is smooth, you don't need to do anything. |
Not-So-GoodSamaritan 正式會員 210.xxx.xxx.97 |
2010-01-04 12:20 |
| [#3] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 May I add some thought? Not-So-GoodSamaritan hing? 1. 這些擴散板的效果如何呢? 應如何擺放? place them at first reflections points, say left, right , front and back. but the distance between them and the listener has to be large enough for them to work, say 10 feet. for rooms in hong kong, it is not much use. ***** Some like adding absorption materials at the first reflection points. It is used to absorb 'first reflection' sound to make a better imaging and reduce harshness of sound esp. if your speakers are small. Google it and you could easily learn more. A good alternative of diffusers is use a lot of bookcases filled with books (just one won't do) placed irregularly. It costs very little if you are a book lover. ********* 2. 怎樣決定自己的聆聽環境是否需要吸音裝置呢? use your ears or do a measuremnt. ********* If you found the sound harsh or chaotic, you 'probably' need diffusers for mids and highs at strategic points. If you found booms, you may also need bass traps. But sometimes you can reduce the problem to various extents by positioning the speakers wisely. (for example, move the speakers a bit if you find boom - you probably have placed them at 'resonance points' of the room) ************* 3. 如果家中沒有boom, 是否不需要吸音呢? then you are lucky. instead of booming, you might have suck out of certain frequency. if you low frequency response is smooth, you don't need to do anything. ********* Absorption do several things for different frequencies, and only one of which is to reduce boom. Having NO boom doesn't mean you don't need absorption. I think the most important thing is to find the key problems of sound one has ... absorption is only one of the solutions to some problems, although it is a powerful. But misapplied, you may create other problems ... Hope it's not too confusing. I suggest you read more thr google first... But one could use cheaper alternatives (bookcases, thick carpets and curtains, or even large plants instead of professional products) ... |
zbigniew821 正式會員 218.xxx.xxx.73 |
2010-01-04 19:15 |
| [#4] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 May I add some thought? Not-So-GoodSamaritan hing? ---------- do whatever you want to. i'm not the one after the answers^-^ i don't share your optimism on using bookshelves though. both absorber and diffusers have predictable effect over its designed frequency range. book shelves are ad hoc and therefore unpredictable and inconsistent. i mysefl is an absorption man but if i have to choose between bookshelves and two parallel surfaces, i will choose the latter. but that is just me. |
Not-So-GoodSamaritan 正式會員 121.xxx.xxx.188 |
2010-01-04 19:26 |
| [#5] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 for 2 channel an over damped room will kill off the reverberations and reflections to give you a very dead soundstage. needs to get diffusion and absorption balanced. for multi channel rooms due to speakers combing effects and phase cancellations it is advantageous to have an absorptive room. |
cpu8088 正式會員 115.xxx.xxx.214 |
2010-01-05 05:20 |
| [#6] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 for 2 channel an over damped room will kill off the reverberations and reflections to give you a very dead soundstage. needs to get diffusion and absorption balanced. --------- i doubt this very much. you might have a skewed absorption. this is what gave room treatment a bad name. over absorption? very unlikely. |
Not-So-GoodSamaritan 正式會員 210.xxx.xxx.97 |
2010-01-05 09:40 |
| [#7] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 I always against absorption cause it create more serious problem while solving reflection problem... It is easy to absorpt very high frequency but hard to absorpt mid-low frequency. It distort the balance of frequency response. I would say one may lose more than gain by using absorption... I am currently testing on other tweak to solve reflection problem.... really take time to test.... |
hiphopzz 正式會員 59.xxx.xxx.60 |
2010-01-05 11:27 |
| [#8] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 It is easy to absorpt very high frequency but hard to absorpt mid-low frequency. It distort the balance of frequency response ------- that's because one uses the wrong type of absoption panels. many just use a couple of inches of sonex panel for first reflections. these will only skew the frequency spectrum. and you are right. it is better to do without. however using something like 4 inches will bring the freqeuncy range down to say 500 hz. this will be good for reflections. for low, one has to use bass traps. |
Not-So-GoodSamaritan 正式會員 210.xxx.xxx.97 |
2010-01-05 12:22 |
| [#9] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 yes... using thick absorbor can absorb lower frequency... but the absorption rate to different frequency is hard to change. Some low frequency may have be absorbed but much much more high frequency are sacrificed..... and it is my experience and testing result.... ^^ |
hiphopzz 正式會員 59.xxx.xxx.60 |
2010-01-05 12:40 |
| [#10] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 and it is my experience and testing result.... ^^ --------- well, it is difficult to achieve better than 5db flatness. i've 11 bass traps and a dozen or so bass panels. i still use room correction^-^ |
Not-So-GoodSamaritan 正式會員 210.xxx.xxx.97 |
2010-01-05 14:23 |
| [#11] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 """doubt this very much. you might have a skewed absorption.""" no i dont """this is what gave room treatment a bad name.""" room treatment does not have a bad name. only wrong applications give it a bad name. there are many competent professionals doing recommendations and advice. of couse similar in any other industries there are less competent ones running around giving bad ideas. """over absorption? very unlikely.""" your guess only. |
cpu8088 正式會員 115.xxx.xxx.214 |
2010-01-05 20:20 |
| [#12] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 your guess only. ------ may be. have you measured any home environment that is over absorbed? i haven't. if you find one, i would be interested to measure it. i will bring my own equipment. otherwise it is your guess not mine. |
Not-So-GoodSamaritan 正式會員 121.xxx.xxx.187 |
2010-01-05 20:36 |
| [#13] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 An example of small room acoustics measurement with standing waves & too much aborption at hi-mid-freq according to IEC/ISO (before FIR correction), FYI.  |
長長影子 正式會員 118.xxx.xxx.183 |
2010-01-05 22:50 |
| [#14] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 Also, Energy-Time-Freq measurement, FYI.  |
長長影子 正式會員 118.xxx.xxx.183 |
2010-01-05 22:52 |
| [#15] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 P.S. 擴散板就算放近聆聽點仍然會WORK,我相信唔WORK只係擴散設計唔夠好,距離可參考擴散板diffusion or scattering coeff.量測規格.. |
長長影子 正式會員 118.xxx.xxx.183 |
2010-01-05 23:05 |
| [#16] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 An example of small room acoustics measurement with standing waves & too much aborption at hi-mid-freq according to IEC/ISO (before FIR correction), -------- is that too much absorption or skewed absorption? if i understand your plot, it shows too much absorption at the mid to high frequency. but that is not the point of discussion here. that can be easily created without a doubt. |
Not-So-GoodSamaritan 正式會員 121.xxx.xxx.187 |
2010-01-05 23:05 |
| [#17] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 P.S. 擴散板就算放近聆聽點仍然會WORK,我相信唔WORK只係擴散設計唔夠好,距離可參考擴散板diffusion or scattering coeff.量測規格.. ----- if what you meant by 'work' is any kind of diffusion, of course it works. but that applies to almost most things. |
Not-So-GoodSamaritan 正式會員 121.xxx.xxx.187 |
2010-01-05 23:09 |
| [#18] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 Not-So-GoodSamaritan, don’t worry, just an example to show the problems appear in small room acoustics without appropriate treatments. |
長長影子 正式會員 118.xxx.xxx.183 |
2010-01-05 23:13 |
| [#19] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 For the diffusor measurments the sound source located at 2m away from the diffusor & the measurement positions are 1m around the diffusor. The performance is defined as above. |
長長影子 正式會員 118.xxx.xxx.183 |
2010-01-05 23:15 |
| [#20] 環境調控: 擴散板 - 塊布膠 - 木 & 吸音裝置 影子提供嘅圖唔錯喎，六十至七十周嘅駐波，reverb幾乎有成秒咁耐，百二周打上就短過0.3秒。唔怪得我地成日話低音慢喇。 |
25908723 正式會員 203.xxx.xxx.50 |
2010-01-05 23:32 |
