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【香港隔音艙】移動隔音房的通風問題,解決方法全紀錄

移動隔音房

隔音艙是新興的隔音產品,利用了傳統房中房 (box in box) 的隔音原理,有效地提供人們一個安靜的環境來工作和休息。

如下紀錄了我們如何解決現有的各種問題,並引入香港住宅中。

(下圖是旺角店的陳列室)

隔音艙運輸上樓問題

為了引入這種產品,首先我們要解決的就是運輸上樓的問題。

市面上的移動隔音房,本身不是為香港樓宇設計,他的高度已經不能放在8尺樓底高的住宅中。

而且,香港的電梯十分細,貨是進不到電梯的。於是,我們需要重新設計,把這個產品模組化,另外造模,令到每件配件都可以成功進入香港的電梯中。

(圖中2023年,為北角住宅客戶收貨的相片)

隔音房的通風問題

好了,解決了運輸上的問題,接下來就是最難搞的技術問題。市面上的隔音艙存在三種問題:

1. 使用小型風扇,房中二氧化碳含量嚴重超標:

這是大部份隔音房工廠會使用的方法。

其實這種扇就是平時我們電腦用來散熱的同一種。

大家都可以想像到了,連電腦主機的箱只有不到半平方呎,

也散不到太多熱力,不用說這麼大型的隔音 Box了。

(下圖是使用小型風扇的情況下,坐了5分鐘,二氧化碳含量已到1500ppm)

註:1000ppm為國際標準,我坐了5分鐘已難以呼吸,停止測試

2. 使用大型抽風機,進風口大,隔音少於20 dB;

有些隔音艙直接加裝了大抽氣扇。這個不用數據,用常理都可以想到,在隔音房中開一個比藍球還大的洞,就已經失去了隔音的意義了。

 3. 使用強力風機,風噪和馬達聲非常吵耳。

有些工廠使用馬力大的抽風機,開一個小洞口做通風。

雖然解決了鮮風和隔音的問題,但又產生了另外一個問題,就是非常嘈的馬達聲音,噪音高達60多分貝,仿如置身於工廠中一樣。

(下圖為拜訪上海 Tesla 超級工廠的隔音零件測試室)

流動隔音房的核心問題

我們走訪了國內幾乎所有製造這個產品的工廠,沒有一間工廠能同時解決這個問題。

所以,核心問題就在於通風了。能通風,又不隔音,如果風機太大,風噪又十分吵耳。

核心問題是,我們要造一個能隔音,夠鮮風,又靜音的通風系統出來。

隔音解決過程

為了解決這個問題,我們從各個角度進行了研究。

幸好店長家中兩代人,都是為發展商打工的工程師,就只有店長出來搞音樂。

二哥是新世界發展的通風顧問,提供了寶貴的建議。

後來因為工程朋友的引薦,去了上海Tesla的超級工廠參考他們的零件測試隔音房,並向他們學習他們的製造工藝和使用材料。

在這些建議的幫助下,我們進行了大量的測試和實驗,以確定最佳的隔音艙設計和通風系統。

現場實測

經過18個月的研究,40多次的測試,我們終於可以做到,二氧化碳含量少於1000ppm,風噪少於30 dB,而且隔音超過30 dB

系統是如何設計,就不多說了,直接看結果:

(下圖是8小時測試,二氧化碳含量只有 612-779 ppm)

這種創新的通風系統,它不僅能夠保持室內空氣新鮮,而且可以避免房間中的二氧化碳含量過高。

隔音材料和隔音結構,以最大程度地減少外界噪音的干擾。而且機器的噪音和震動都過標準。

(下圖為旺角店陳列,於隔音房中拍攝)

隔音艙的法例標準

是否一定要做到700ppm? 其實不一定的,2000ppm以下即使腦部缺氧,都不會有即時生命危險,法例也沒有對於這種新興產品有明文的規管。

但是,一件產品要安全有效,我們才能賣出去,也是我們的原則。

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【電結他】新手購買前,必須要知的五件事

對於初學者來說,購買一把適合自己的電結他可能會是一個困難的挑戰。在開始挑選之前,有幾件事情是必須要知道的。在本文中,我們將列舉五件新手購買電結他前必須要知道的事情,以幫助你做出最好的選擇。

電結他的種類

電結他有多種種類,包括單則電結他、雙則電結他和半空心電結他等。每種電結他都有自己獨特的聲音和風格,因此在選擇時要根據自己的音樂風格和口味做出決定。

頸部的形狀

頸部的形狀也是非常重要的因素,它會影響到你的手指的運動和握持,從而影響你的演奏水平。電結他的頸部形狀分為"C"形、"V"形、"U"形和"細頸"等多種,選擇時要根據自己的手型和握持習慣做出決定。

拾音器的種類

拾音器是電結他的重要部分,它決定了樂器的聲音質量和音色。目前市場上有多種拾音器,包括磁鐵式、聚酯薄膜式、鋰離子電池式等,每種拾音器都有自己的優缺點。要根據自己的需求和預算做出選擇。

木材的種類

電結他的聲音和音質也受到木材種類的影響。目前市場上主要有楓木、桃花心木、黑檀木等多種木材可供選擇。不同的木材具有不同的音色和聲音特點,選擇時要根據自己的音樂風格和口味做出決定。

預算

最後一個因素是預算。電結他的價格範圍非常廣泛,從幾百元到幾萬元不等。要根據自己的預算和需求做出選擇,不要過度。

常見問題

1. 電結他和原聲結他有什麼區別?

展開/收起

電結他和原聲結他最大的區別在於聲音。電結他通過拾音器和放大器來放大聲音,聲音更加清晰明亮,音量也更大;而原聲結他是自然發聲,聲音更加溫暖柔和,通常用於獨奏、彈唱等較為安靜的場合。

2. 電結他和吉他效果器有什麼區別?

展開/收起

電結他和吉他效果器也有區別。電結他是樂器本身,具有各種聲音,可以直接彈奏;而吉他效果器則是一種音效設備,通過連接樂器和音箱來實現各種音效。

3. 電結他需要哪些配件?

展開/收起

一般來說,電結他需要的配件包括放大器、拾音器、吉他線、吉他帶、調音器、吉他譜架等。根據自己的需要和預算,可以選擇不同的品牌和型號。

4. 新手如何學習彈奏電結他?

展開/收起

學習彈奏電結他可以通過多種方式,例如自學、找老師、網上課程等。新手可以從基礎樂理、和弦、節奏等方面入手,慢慢學習和練習,多聽、多模仿,並不斷挑戰自己,不斷提高自己的技能。

5. 買電結他需要注意哪些問題?

展開/收起

購買電結他需要注意的問題包括:樂器的品牌和型號、拾音器的種類、頸部形狀、木材種類、預算等。在選擇時要根據自己的需求和預算做出適

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【樓上噪音】最終及唯一解決方法【2023 香港住宅篇】

 

住宅樓上噪音是一種結構噪音,這種噪音是由於共鳴效應所造成的。

當音頻在物體中傳播時,物體會引起共震,造成噪音。

在住宅樓上,這種共震是由於上層的噪音通過建築物的結構而傳到下層房間的現象。



然而,加裝隔音天花並不能有效地解決這個問題。

因為結構噪音是由整個建築物的結構引起的,而不是單單由天花造成的。

因此,加裝隔音天花只能減少極少量的噪音,但不能完全消除噪音。



唯一有效的解決方法是「房中房」的方法。

這種方法是指將建築物的結構分離,以防止噪音通過結構震動而傳播。

房中房可透過兩種方法實現:

1. 隔音房中房裝修

這種方法非常昂貴及耗時,常用於演奏廳,戲院。

2. 模組化房中房

數以百萬計的裝修,用數萬元即可解決,按下圖連結參考



總之,住宅樓上的噪音問題是由共鳴效應造成的,加裝隔音天花並不能解決這個問題,唯一有效的解決方法是「房中房」的方法。

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[Sound insulation project] Common soundproofing materials - sound insulation cotton, sound absorbing panels, sound insulation carpets, sound insulation doors HongKong

1. Polyester fiber sound-absorbing board: It is an ideal indoor sound insulation material.

The raw material is 100% polyester fiber, which has sound absorption, environmental protection, flame retardant, heat insulation, heat preservation, moisture resistance, mildew resistance, easy dust removal, easy cutting, can be parquet, easy construction, good stability, good impact resistance, independent The advantages of good performance and high cost performance.

There are a variety of colors to choose from, which can meet the needs of different styles and levels of sound-absorbing decoration. Mainly used in theaters, concert halls, museums, exhibition halls, libraries, interrogation rooms, galleries, auction halls, gymnasiums, lecture halls, multi-purpose halls, hotel lobbies, hospitals, shopping malls, schools, piano rooms, conference rooms, studios , recording studios, KTV rooms, bars, industrial plants, computer rooms, home noise reduction and other places with high requirements for acoustic environment and high-end decoration.

2. Wave crest sound-absorbing sponge: The wave crest sound-absorbing sponge is an indoor sound insulation material. It is a kind of sponge that is specially treated by equipment to form a concave and convex wave shape. It can attenuate, reduce the interference and reverberation of indoor reflected sound, and improve the purity of the sound.

3. Sound insulation felt: Sound insulation felt is made of odorless EPDM rubber and more than a dozen organic minerals in a certain proportion. The product is black, environmentally friendly and has no peculiar smell. The thickness of the material varies from 1mm, 2mm and 3mm. The weighted sound insulation amount is 23dB, 27dB and 30dB respectively after testing by the National Building Materials Bureau. The flexibility of the material is also very good, and it can be bent at any Ribbon cutting, construction is very convenient and fireproof sound insulation material.

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The function of sound insulation decoration methods (sound insulation cotton, sound absorbing panels, floor mats) can be seen clearly in one article

The decoration of the room is different from the decoration of the living room. In addition to paying attention to the aesthetics of the decoration, it also pays more attention to the comfort.

A comfortable room allows people to truly relax and have a good sleep quality.

What are the methods of soundproofing the room? What are the sound insulation materials?

Many owners are more concerned about sound insulation when they decorate their rooms. In response to this problem, the following is a detailed introduction to you.

Room soundproofing method:

Most of the indoor noise pollution comes from the outside of the window. When carrying out the sound insulation decoration of the room, you can also consider choosing some window frames and sound insulation strips for the windows with better sound insulation effect, so as to achieve a relatively good sound insulation effect. .

Among them, the window glass can be made of vacuum glass, which has a better sound insulation effect. If the requirements for sound insulation are relatively low, you can choose insulating glass.

The window frame is mainly made of aluminum alloy or plastic steel, which has better sound insulation effect.

The sound insulation of the room can also be done in the aspect of the door. There are also many materials for the door. Among them, the sound insulation effect of solid wood doors and solid wood composite doors is better than other door materials. In addition, the sound insulation effect of the door is good and the filling material in the door is also related.

The particleboard filler has a better sound insulation and sound absorption effect. If the sound insulation demand is relatively large, you can choose the door filler of this material.

 

The sound insulation of the room can also be decorated on the wall. When the house is decorated, the sound insulation felt is installed in the wall to achieve the purpose of sound insulation.

Moreover, this sound insulation method mainly embeds objects into the wall, which will not affect the appearance.

If it is really a noisy environment, you can also achieve better sound insulation by using soft packaging in the front, but the decoration method of soft packaging will be relatively more expensive.

Part of the noise in the room may come from the sound of footsteps upstairs. In this case, the ceiling can be used to solve this problem. When the ceiling is suspended, a sound insulation layer can be added, which can reduce the impact of the upstairs on the downstairs noise. . 

What are the materials for sound insulation:

Sound-absorbing cotton

This is a relatively common sound insulation material. It is relatively simple to process, and also has the performance of waterproof and moisture-proof, and has better air permeability. However, sound-absorbing cotton also has some shortcomings, that is, the flame retardancy is relatively poor, and it cannot achieve the purpose of blocking fire. If sound-absorbing cotton is used in the home, you need to pay attention to the problem of fire prevention.

wood wool sound-absorbing board

It is a very popular sound insulation material at present. This kind of sound insulation material is usually made of poplar fiber. The texture of the surface is relatively natural, the appearance is more high-end and atmospheric, and the sound insulation effect is very good. This kind of sound insulation material is mostly used in entertainment places such as KTV.

Acoustic panels

In fact, many materials now have the effect of sound insulation, especially after some processing, the sound insulation effect is better, also known as sound insulation board. When purchasing sound insulation boards, you need to pay attention to whether there are relevant test reports. If there is no test report, it means that the sound insulation effect is not good enough, and you should avoid choosing.

  

The above is the introduction to the sound insulation decoration methods of the room and several different sound insulation materials. I believe everyone has some understanding.

There are many methods of sound insulation, and the materials required for different sound insulation methods and the effect of sound insulation are different.

When decorating, the owner should choose the overall decoration style, decoration budget and needs, so as to create a more satisfactory room decoration effect.

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[Educational Franchise Strategy] Franchising, how to calculate how much the brand is worth?

Education center franchise, franchising,

Refers to a number of individual shop operators throughguidance,operate the same brand.

Operators can quickly acquire business knowledge and reduce startup time.

Among them, how much the brand is worth determines the franchise fee receivable by the head office.

This article describes three of the simplest estimation methods.

(1) Duan Jinscales

The total value of advertising, marketing, human resources, etc. that the brand has put in the past.

For example, assuming that Feiteng Education started in 2007 and put 1 million online advertisements for branding every year,

By 2017, the brand valuation is 1 million x 10 years = 10 million.

shortcoming:

This method is simple and crude, because Feiteng Music's total investment of 10 million is not necessarily the most efficient.

10 million in exchange may only be less than 1 million efficiency.

Conversely, brand value may also be underestimated,

Because 10 million may generate the efficiency of 100 million invested by other companies.

Moreover, this method is based on cost, and the brand's great value lies in future expectations, not past history.

 

However, this can give prospective franchise operators a basic concept,

A more extreme example, a brand that has not invested enough 100,000 yuan, but charges 100,000 yuan for the franchise fee,

We will think: Is it reasonable to join this brand?

(2) Cut off the heavy practice trick

Starting today, how much capital do you need to re-establish a Feiteng Education brand?

If it is 1 million, then the brand of Feiteng Music (Goodview) is worth 1 million.

 

shortcoming:

 

This approach is also cost-driven and fails to reflect expectations for the future.

Also, there is very little possibility of recreating an identical brand to compare,

The value of a brand lies in its uniqueness, which is difficult to compare.

 

However, this can give prospective franchise operators a basic concept,

That is, in Management Accounting,

Which is better buy or make decisions?

(3) There is no comparison, no harm method

A product with a brand name and an unprinted selling price.

For example, a smart phone sells for 1,000 yuan on Taobao.

The phone, with the Apple Logo, can sell for 10,000 yuan.

The company sells 100 products a year.

The brand valuation is the difference (9,000 yuan x 100 = 900,000)

Of course, the calculation method needs to include the brand's market share, repeat purchase rate, future growth rate, and so on.

 

shortcoming:

This method is more accurate, but requires a lot of market data.

Moreover, there are many factors that affect the selling price of products, such as market demand, parts supply, economic cycle, etc., and brand is only one of them.

 

However, this can give prospective franchise operators a basic concept,

"with you or without youIs there a difference?

 

Extended reading (3) Requirements for joining Feiteng Music

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[Education Franchise Entrepreneurship] Top or join? Education franchise income calculation

There are three ways to start running the education industry.

(one) topExisting Education Center

(two)joinexistingEducation Center

(three)Create your owna brand newEducation Center

This article will analyze the differences between the three and the details that need attention.

(1) Top Education Center

take overLike other companies, the education center's selling price is the most critical part.

This will affect future payback cycles, entrepreneurial cash flow, and more. The ask price consists of two key elements:

 

(A) Asset transfer (Duanjin Scale)

The piano shop has 10 straight pianos worth 100,000 yuan, decoration of 100,000 yuan, and making money tools of 100,000 yuan.

The net asset value of the music company is 300,000.

 

(B) P/E ratio (future return time)

The music store earns 100,000 a month, the selling price is $1.2 million, and the payback period is one year (P/E ratio = 1)

 

Of course, this is the simplest and crudest method of valuation. There should be many elements in it.

Including goodwill, future growth expectations, etc.

But this is the most basic concept of acquiring a company.

 

The devil is in the details:

1. In the calculation of (A) Asset transfer, is there any depreciation calculation?

The purchase price of the instrument, not equal to the current value.

 

2. It is the assets that bring cash income, the opposite is the liabilities.

If the piano store itself does not have a certain ability to make money, 300,000 is just a liability.

 

3. In (B)In the price-earnings ratio calculation, whether the income of the music company passes through yourdue diligence(due diligence)?

Before purchasing a company, the buyer must consult the company's audit report.

In order to know whether the company you buy has debts, whether the assets are overvalued, the company's ability to make money, and so on.

A qualifying audit report, roughly like this:

 

Even many listed companies have a lot of water in their accounts after being audited by the big accounting building.

However, a Hong Kong limited company is required to file with the Inland Revenue Department annually,

An audit report issued by a qualified auditor.

Checking the audit report is the most basic due diligence before buying a company.

 

Extended reading (2) How much is the brand worth when joining an existing chain education center?

Extended reading (3) Requirements for joining Feiteng Education

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[How to join a piano store] How much is a reasonable franchise fee for a piano store? How to calculate how much the brand is worth?

Education center franchise, piano franchising,

Refers to a number of individual shop operators throughguidance,operate the same brand.

Operators can quickly acquire business knowledge and reduce startup time.

Among them, how much the brand is worth determines the franchise fee receivable by the head office.

This article describes three of the simplest estimation methods.

(1) Duan Jinscales

The total value of advertising, marketing, human resources, etc. that the brand has put in the past.

For example, assuming that Feiteng Music started in 2007 and put 1 million online advertisements for branding every year,

By 2017, the brand valuation is 1 million x 10 years = 10 million.

shortcoming:

This method is simple and crude, because Feiteng Music's total investment of 10 million is not necessarily the most efficient.

10 million in exchange may only be less than 1 million efficiency.

Conversely, brand value may also be underestimated,

Because 10 million may generate the efficiency of 100 million invested by other companies.

Moreover, this method is based on cost, and the brand's great value lies in future expectations, not past history.

 

However, this can give prospective franchise operators a basic concept,

A more extreme example, a brand that has not invested enough 100,000 yuan, but charges 100,000 yuan for the franchise fee,

We will think: Is it reasonable to join this brand?

(2) Cut off the heavy practice trick

Starting today, how much money do you need to re-establish a Feiteng Music brand?

If it is 1 million, then the brand of Feiteng Music (Goodview) is worth 1 million.

 

shortcoming:

 

This approach is also cost-driven and fails to reflect expectations for the future.

Also, there is very little possibility of recreating an identical brand to compare,

The value of a brand lies in its uniqueness, which is difficult to compare.

 

However, this can give prospective franchise operators a basic concept,

That is, in Management Accounting,

Which is better buy or make decisions?

(3) There is no comparison, no harm method

A product with a brand name and an unprinted selling price.

For example, a smart phone sells for 1,000 yuan on Taobao.

The phone, with the Apple Logo, can sell for 10,000 yuan.

The company sells 100 products a year.

The brand valuation is the difference (9,000 yuan x 100 = 900,000)

Of course, the calculation method needs to include the brand's market share, repeat purchase rate, future growth rate, and so on.

 

shortcoming:

This method is more accurate, but requires a lot of market data.

Moreover, there are many factors that affect the selling price of a product, such as market demand, parts supply, economic cycle, etc., and brand is only one of them.

 

However, this can give prospective franchise operators a basic concept,

"with you or without youIs there a difference?

 

Extended reading (3) Requirements for joining Feiteng Music

 

Read more →

[Opening a piano store to start a business] The piano store tops or joins? The cost and income of the education industry is calculated

There are three ways to start a piano business.

(one)topExisting piano shop

(two)joinExisting Chain Music Stores

(three)Create your ownA brand new piano shop

This article will analyze the differences between the three and the details that need attention.

(1) Top piano shop

Like other companies, the selling price is the most critical part of taking over the top.

This will affect future payback cycles, entrepreneurial cash flow, and more. The ask price consists of two key elements:

 

(A) Asset transfer (Duanjin Scale)

The piano shop has 10 straight pianos worth 100,000 yuan, decoration of 100,000 yuan, and making money tools of 100,000 yuan.

The net asset value of the music company is 300,000.

 

(B) P/E ratio (future return time)

The music store earns 100,000 a month, the selling price is $1.2 million, and the payback period is one year (P/E ratio = 1)

 

Of course, this is the simplest and crudest method of valuation. There should be many elements in it.

Including goodwill, future growth expectations, etc.

But this is the most basic concept of acquiring a company.

 

The devil is in the details:

1. In the calculation of (A) Asset transfer, is there any depreciation calculation?

The purchase price of the instrument, not equal to the current value.

 

2. It is the assets that bring cash income, the opposite is the liabilities.

If the piano store itself does not have a certain ability to make money, 300,000 is just a liability.

 

3. In (B)In the price-earnings ratio calculation, whether the income of the music company passes through yourdue diligence(due diligence)?

Before purchasing a company, the buyer must consult the company's audit report.

In order to know whether the company you buy has debts, whether the assets are overvalued, the company's ability to make money, and so on.

A qualifying audit report, roughly like this:

 

Even many listed companies have a lot of water in their accounts after being audited by the big accounting building.

However, a Hong Kong limited company is required to file with the Inland Revenue Department annually,

An audit report issued by a qualified auditor.

Checking the audit report is the most basic due diligence before buying a company.

 

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【Review and Comparison】Yamaha P125 vs Roland FP-30x vs Ena FS-210 Digital Piano

Yamaha P125 vs Roland FP-30x vs Ena FS-210

It is the three best-selling entry-level digital pianos on the market. This article makes a comparison from the following five aspects:

  1. feel
  2. sound output
  3. Portability
  4. Electronic function
  5. Price

keyboard performance comparison

In terms of internal structure

All three use the heavy hammer technology to touch the striking feel of the simulated piano with the most primitive principle of the tribute rod.

In terms of appearance and texture

Yamaha P125 uses reflective rubber keys,

The FP-30x and Ena FS-210 quality uses a non-slip ivory key feel.

Further reading: What is the definition of a digital piano that feels good? What does it mean to feel like a piano?

Different sound output

The Yamaha P125 uses a 7W output, which is slightly insufficient.

Roland FP-30 uses 11w, which is sufficient for indoor use.

Ena FS-210 also uses a 25W speaker, which is usually enough for indoor playing with a volume of about 30%. If the volume is higher than 80%, it will be very loud, affecting upstairs and downstairs.

Different techniques for sound sampling

The Pure CF of the Yamaha P125 uses samples from the world-renowned Yamaha CFlll 9'Concert Grand. Each note is recorded multiple times at different velocity levels to reproduce the richness and dynamic range of traditional instruments, using 4 layers of sampling to produce more Smooth and dynamic sound. In layman's terms, it is to record multiple layers of samples with different dynamics, and then play the corresponding sound according to how hard the keys are struck.

The Roland FP-30x uses SuperNATURAL modeling technology, which takes full-length samples of an acoustic piano, and uses modeling technology to generate unused samples and record them, and then release them smoothly through speed and velocity.

Ena FS-210 adopts Dreampure sound source, the chip is Dream processor made by French acoustic factory.Featuring an acoustic piano engine, it recreates the richness and dynamic range of traditional instruments.

Different polyphony between P125 and FP-30

Polyphony refers to the number of notes an electric piano can produce simultaneously. The Ena FS-210, Roland FP-30 have 128-note polyphony, while the Yamaha P125 has 192-note polyphony.

Portability Comparison

Portability is one of the important considerations for Hong Kong people.

In terms of body size, the Ena FS-210 is the least bulky, the Yamaha Size is the largest, and the lightest.

Electronic feature comparison

Bluetooth connection function

The P125 does not have a Bluetooth connection.

The FP-30 and ENA FS-210 have Bluetooth connectivity to connect to a variety of smart devices without cables.

price comparison

Among the three, the Roland FP-30x made in Malaysia is the highest and the cheapest is Ena's FS-210.

Feiteng Music Center provides a choice of digital pianos of different brands, please click here for reference

Digital PianoElectric PianoKeyboardKeyboard Yamaha Casio Roland Korg

 

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