The speaker is basically composed of three parts: speaker, crossover, and cabinet. According to the number of speakers, it is divided into two units and three units. . . .
There is also a kind of integrated tweeter and woofer, called a coaxial unit. From the appearance, it is a unit. In fact, it is still a two unit.
As the name suggests, the frequency divider divides the audible sound frequency band [20--20000Hz] into several frequency bands and sends them to the corresponding speaker units. According to how much the frequency band is divided, it is divided into high, the two bass bands are called two-way frequency division into high, medium and low three bands are called three-way frequency, and so on.
The cabinet is generally made of logs or MDF. According to the structure of the cabinet, it is divided into a closed box [no phase reversal holes, the air inside the cabinet is insulated from the outside], and an inverting box [with phase reversal holes]. There are also some uncommon box structures: labyrinth, exponential, negative resistance, horn, etc.
According to the scope of use of the speakers, it is divided into: professional boxes [for sound reinforcement of performances, halls, halls, venues, halls]
Monitoring box [Professional monitoring for various recording institutions] Civilian box.
According to the placement method of the speaker, it is divided into a bookshelf box and a floor box. The bookshelf box is mostly a two-unit, two-frequency structure, which is mostly used in rooms within 20 square meters. The floor box is mostly multi-unit, multi-frequency structure. Use more than 20 square meters.
Speaker performance indicators:
General speakers are marked with many of his application parameters. The most common ones are:
Power: It is generally measured by W or VA, the common is nominal power [rated power, undistorted power] refers to the maximum input power under the condition that the non-linear distortion does not exceed the standard range of the speaker. He is the normal working power of the speaker, and continuous working for a long time will not damage it.
Sensitivity: His definition is the sound pressure generated when a 1 watt power pink noise voltage is applied to the speaker at a meter away from the reference point. Expressed in decibels [db]. The higher the sensitivity of the speaker, the louder it is at the same driving power. This is very important when using a small power amplifier.
Impedance: It refers to the audio signal added to the speaker input, the speaker presents a pure resistance. The common ones are 4 Euro, 8 Euro, and there are also 3 Euro and 5 Euro systems abroad. Pay attention to match the output impedance of the power amplifier when using. In particular, the matching of the amplifier to the speaker impedance is particularly important.
Frequency Range:
Its definition is not clear in a few words. Generally speaking, it refers to the frequency reproduction range when the speaker falls negative 3 db at the high and low ends of the audio range. Naturally, the wider the better, the current HI-FI speakers can be reproduced at the high frequency end of 20,000HZ or even 30,000HZ, so it is not a problem. The low frequency band is limited by the diameter of the speaker and the volume of the cabinet. It is not easy, the low frequency band of general bookshelf speakers is even worse.
Okay, now you already know the speakers. Seriously it's simple, but it's not easy to do well. It is not difficult for first-time fans to master a certain speaker knowledge base and make a pair of entry-level HI-FI speakers by themselves. Especially now some merchants have launched a lot of speaker kits. As long as you carefully install according to the production drawings, the success rate is extremely high, and because these kits have been carefully designed and matched by the manufacturer, the sound quality and effect are guaranteed. And its cost is only one-half to one-quarter of the finished product. Compared with the imported speakers with a set of units, the author uses the gentleman's treasure 8545K unit to elaborately compare the speakers with a set of units. After listening to the evaluation of many senior audiophiles, the sound effect is definitely not under foreign goods, and the cost is only more than 3,000 yuan, only four of the imported goods. One in one.
Do not pull the Lang to match the speaker, buy a few units and crossovers, buy a finished box and install it. The speaker made in this way is definitely not good. Moreover, there are too many fake and inferior products on the market, and the quality cannot be guaranteed. The more insurance method is to mail order kits from some high-reputation sales units. If your carpentry skills are good, it is entirely possible to build the cabinet according to the recommended drawings, or find a carpenter to do it as long as the volume of the cabinet matches the recommended volume of the woofer.
Now you can believe in yourself, the speaker can do it yourself! It is easier to make an entry-level speaker. You only need to order a set of a certain quality kit by mail, and make a pair of cabinets that meet the requirements of the kit plus a production day, OK!
In the next issue, we will introduce a few sets of low-cost, easy-to-make and excellent effect speaker kits and spare parts in detail in the next issue. Quickly prepare the silver in your pocket.
There is also a kind of integrated tweeter and woofer, called a coaxial unit. From the appearance, it is a unit. In fact, it is still a two unit.
As the name suggests, the frequency divider divides the audible sound frequency band [20--20000Hz] into several frequency bands and sends them to the corresponding speaker units. According to how much the frequency band is divided, it is divided into high, the two bass bands are called two-way frequency division into high, medium and low three bands are called three-way frequency, and so on.
The cabinet is generally made of logs or MDF. According to the structure of the cabinet, it is divided into a closed box [no phase reversal holes, the air inside the cabinet is insulated from the outside], and an inverting box [with phase reversal holes]. There are also some uncommon box structures: labyrinth, exponential, negative resistance, horn, etc.
According to the scope of use of the speakers, it is divided into: professional boxes [for sound reinforcement of performances, halls, halls, venues, halls]
Monitoring box [Professional monitoring for various recording institutions] Civilian box.
According to the placement method of the speaker, it is divided into a bookshelf box and a floor box. The bookshelf box is mostly a two-unit, two-frequency structure, which is mostly used in rooms within 20 square meters. The floor box is mostly multi-unit, multi-frequency structure. Use more than 20 square meters.
Speaker performance indicators:
General speakers are marked with many of his application parameters. The most common ones are:
Power: It is generally measured by W or VA, the common is nominal power [rated power, undistorted power] refers to the maximum input power under the condition that the non-linear distortion does not exceed the standard range of the speaker. He is the normal working power of the speaker, and continuous working for a long time will not damage it.
Sensitivity: His definition is the sound pressure generated when a 1 watt power pink noise voltage is applied to the speaker at a meter away from the reference point. Expressed in decibels [db]. The higher the sensitivity of the speaker, the louder it is at the same driving power. This is very important when using a small power amplifier.
Impedance: It refers to the audio signal added to the speaker input, the speaker presents a pure resistance. The common ones are 4 Euro, 8 Euro, and there are also 3 Euro and 5 Euro systems abroad. Pay attention to match the output impedance of the power amplifier when using. In particular, the matching of the amplifier to the speaker impedance is particularly important.
Frequency Range:
Its definition is not clear in a few words. Generally speaking, it refers to the frequency reproduction range when the speaker falls negative 3 db at the high and low ends of the audio range. Naturally, the wider the better, the current HI-FI speakers can be reproduced at the high frequency end of 20,000HZ or even 30,000HZ, so it is not a problem. The low frequency band is limited by the diameter of the speaker and the volume of the cabinet. It is not easy, the low frequency band of general bookshelf speakers is even worse.
Okay, now you already know the speakers. Seriously it's simple, but it's not easy to do well. It is not difficult for first-time fans to master a certain speaker knowledge base and make a pair of entry-level HI-FI speakers by themselves. Especially now some merchants have launched a lot of speaker kits. As long as you carefully install according to the production drawings, the success rate is extremely high, and because these kits have been carefully designed and matched by the manufacturer, the sound quality and effect are guaranteed. And its cost is only one-half to one-quarter of the finished product. Compared with the imported speakers with a set of units, the author uses the gentleman's treasure 8545K unit to elaborately compare the speakers with a set of units. After listening to the evaluation of many senior audiophiles, the sound effect is definitely not under foreign goods, and the cost is only more than 3,000 yuan, only four of the imported goods. One in one.
Do not pull the Lang to match the speaker, buy a few units and crossovers, buy a finished box and install it. The speaker made in this way is definitely not good. Moreover, there are too many fake and inferior products on the market, and the quality cannot be guaranteed. The more insurance method is to mail order kits from some high-reputation sales units. If your carpentry skills are good, it is entirely possible to build the cabinet according to the recommended drawings, or find a carpenter to do it as long as the volume of the cabinet matches the recommended volume of the woofer.
Now you can believe in yourself, the speaker can do it yourself! It is easier to make an entry-level speaker. You only need to order a set of a certain quality kit by mail, and make a pair of cabinets that meet the requirements of the kit plus a production day, OK!
In the next issue, we will introduce a few sets of low-cost, easy-to-make and excellent effect speaker kits and spare parts in detail in the next issue. Quickly prepare the silver in your pocket.
When people talk about 7inch tablet, kids appears on their minds, especially for elementary students or kindergarten kids for playing intelligent exploitation games or online learning. Clients usually choose 7 inch tablet wifi only as 7 inch educational tablet for project, wifi one is much cheaper. Of course, 7 inch Android Tablet with 3G lite or 4G lite also optional. You can always see a right tablet at this store, no matter amazon 7 inch tablet, 8 inch android tablet, or 10.1 android tablet.
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