What is the difference between speakers and speakers?

**1. Introduction** A speaker is a device that converts audio signals into audible sound. In general, it refers to the power amplifier integrated within the main body of a speaker enclosure or subwoofer. Once the audio signal is amplified, the speaker itself produces the sound, making it louder and more powerful. The speaker enclosure, also known as the sound box, is the final component in an audio system. Its primary function is to transform electrical audio energy into acoustic energy, which is then radiated into the surrounding space. It plays a crucial role in the entire sound system by converting electrical signals into sounds that can be directly heard by the human ear. **The composition of a speaker:** Although there are many types of speakers available on the market, all of them are essentially made up of two fundamental components: the speaker driver (also called the speaker unit) and the enclosure. Most modern speakers use at least two or more drivers to achieve multi-channel audio playback, which means a crossover is also an essential part. Additionally, some speakers may include other elements like sound-absorbing foam, bass reflex ports, labyrinth-shaped tubes, internal braces, or reinforced partitions. However, these are not mandatory for every speaker. The most basic components of a speaker are the driver, the enclosure, and the crossover. ![What is the difference between speakers and speakers?](http://i.bosscdn.com/blog/pI/YB/AF/pht4mAcbXMAACzwpT6ZuM925.jpg) **Speaker classifications:** Speakers can be categorized in various ways depending on different criteria. From an acoustic structure perspective, they can be classified as sealed enclosures, bass reflex (ported) boxes, passive radiator speakers, and transmission line speakers. Each has its own unique characteristics, which are explained in detail elsewhere. Among these, bass reflex speakers are currently the most popular in the market. In terms of size and placement, speakers are divided into floor-standing and bookshelf models. Floor-standing speakers are larger and usually placed directly on the floor, sometimes with shock-absorbing feet. Due to their larger cabinet size and the ability to accommodate bigger woofers, they typically deliver better low-frequency performance, higher sound pressure levels, and greater power handling, making them ideal for larger listening spaces. Bookshelf speakers, on the other hand, are smaller and designed to sit on stands or shelves. They offer more flexibility in placement and take up less space. However, because of their smaller cabinets and limited woofer size, they generally have weaker low-frequency response and lower power handling, making them more suitable for smaller rooms. Based on frequency range, speakers can also be categorized as full-range (wideband) or narrowband. Most speakers are designed to cover the widest possible frequency range, making them wideband speakers. Narrowband speakers, such as subwoofers, are specifically used to reproduce very low frequencies, often found in home theater systems. Lastly, based on whether they have a built-in amplifier, speakers can be either passive or active. Passive speakers do not have an internal amplifier, while active speakers come with one. Most home audio systems today use passive speakers, but subwoofers are typically active. **2. Audio Introduction** Sound refers to any auditory experience other than speech and music, including environmental sounds, animal noises, mechanical sounds, and human-made sounds. An audio system may consist of a power amplifier, peripheral devices (such as compressors, effects processors, equalizers, VCDs, DVDs), speakers (including tweeters, midrange, and woofers), mixers, microphones, and display equipment. Among these, speakers are the key components responsible for producing sound. A speaker typically includes three types of drivers: high-frequency (tweeter), mid-frequency (midrange), and low-frequency (woofer). While most speakers have all three, some may only have two. The evolution of speaker technology can be divided into four major stages: vacuum tube, transistor, integrated circuit, and field-effect transistor. ![What is the difference between speakers and speakers?](http://i.bosscdn.com/blog/pI/YB/AF/pht6qAF0BhAADaIRwxyEw036.jpg) **Audio components:** An audio system may include a power amplifier, peripheral equipment (such as compressors, effects units, equalizers, and exciters), speakers (tweeters, midranges, and woofers), mixers, and sound sources (like microphones, musical instruments, VCDs, and DVDs). Display equipment is also commonly included. Among these, speakers serve as the output devices that convert electrical signals into sound. A typical speaker may contain a combination of tweeters, midrange, and woofers, though not all speakers have all three.

2 Rates Power Meter Socket

Power Meter is a monitoring and testing instrument which determines the power consumption of a connected appliance and the cost of the electricity consumed.

Installing the batteries

Install 3.6V rechargeable Battcrics(NI-MH) . The purpose of the batteries is to store the total electricity and mcinory setting.

Resetting

If an abnormal display appears or the buttons produce no response, the instrument must be reset. To do this,press the RESET button.

Display Mode

Entire LCD can be displayed for about 1 minute and then it automatically gets into Model. To transfer from one mode to the other, press the FUNCTION button.

Mode 1: Time/Watt/Cost Display Display duration(how long) this device connect to power source.LCD on first line shows 0:00 with first two figures mean minutcs (2 figures will occur while occur at 10 min) and the rest shows seconds. After 60mins, it displays 0:00 again with first two numbers meas hour(2 figures will occur at 10hours) and the rest shows minutes. The rest can be done in the same manner which means after 24 hours, it will rc-caculatc. LCD on second line displays current power which ranges in 0.0W~9999W. LCD on third line displays the current electricity costs which ranges in 0.0cost~9999cost. It will keep on O.OOcost before setting rate without other figures.

Mode 2: l ime/Cumulative electrical quantity Display Display duration(how long) this device connect to power source.

LCD on first line shows 0:00 with first two figures mean minutes(2 figures will occur while occur at 10 min) and the rest shows seconds. After 60mins, it displays 0:0() again with first two numbers meas hour(2 figures will occur at 10hours)and the rest shows minutes. The rest can be done in the same manner which means after 24 hours, it will re-caculate. LCD on second line displays current cumulative electrical quantity which ranges in 0.000K WH 〜 9999KWII without other figures. LCD on third line displays''DAY''- "1 "will be showed on numerical part(thc other three figures will be showed at carry) which means it has cumulated electrical quantity for 24hours(one day). The rest can be done in the same manner untial the maximal cumulative time of 9999 days.

Mode 3: Time/Voltage/Frequency Display LCD on first line displays the same as Mode 1 dones. LCD on second line displays current voltage supply (v) which ranges in 0.0V~9999V .LCD on third line displays current frequency (HZ) which ranges in 0.0HZ~9999HZ without other figures.

Mode 4: Time/Current/Power Factor Display LCD on first line displays the same as Mode 1 dones.

LCD on second line displays load current which ranges in 0.0000A~9999A. LCD on third line displays current power factor which ranges in 0.00PF 〜 1 .OOPF without other figures.

Mode 5:Time/Minimum Power Display LCD on first line displays the same as Mode 1 clones. LCD on second line displays the miniinum power which ranges in 0.0W~9999W. LCD on third line displays character of "Lo" without other figures.

Mode 6: I,ime/Maximal Power Display LCD on first line displays the same as Mode 1 dones. LCD on second line displays the maximal power which ranges in 0.0W~9999W. LCD on third line displays character of "Hi" without other figures.

Mode 7: Time/Price Display LCD on first line displays the same as Mode 1 dones. LCD on third line displays the cost which ranges in O.OOCOST/KWH 〜 99.99COST/KWH without other figures.
Overload Display: When the power socket connects the load over 3680W, LCD on second line displays the"O VER LOAD" with booming noise to warn the users,( 1918935, 60470643, 60469303,selectable choice)
Supplemental informations:
1: Except tt OVERLOAD , ' interface, LCD on first line display time in repitition within 24hours.
2: LCD on first line, second line or third line described in this intruction take section according to two black lines on LCD screen. Here it added fbr clarified purpose.
3. Mode 7 will directly occur while press down button "cost".
4. [UP"&''Down" are in no function under un-setting mode.
Backlight Mode:
Connect to AC power,backlight im mediately light,if not press any button,backlight will went off in 15 seconds.
When press any of the buttonsbacklight start light again. (Backlight only light when it connect to AC power,backlight cannot light if use battery)
Setting Mode
1. Electricity price setting
After keeping COST button pressed lasting more than 3 seconds(LCD on third line display system defaults price, eg O.OOCOST/KWH ),the rendered content begins moving up and down which means that the device has entered the setting mode. Then press FUNCTION button to change selection and press UP/DOWN to set what you want. (On pressing once, the figure after domical point will increase or decrease accordingly. On pressing and hold-on, figures after demical point will increase or decrease slowly in 2 seconds while figures change quickly when hold-on time exceeds 2 seconds. When hold-on time reaches 10 seconds or more, the figures after demical point will stop while the figures before demical point begin to increasing or decreasing.) After that, press FUNCTION fbr swithing, then press [UP'nd "DOWN" button again to set value which ranges in OO.OOCOST/KWH 〜 99.99COST/KWH. After setting all above, press COST to return to Mode7 or it will automatically return to Mode7 without any pressing after setting with data storage.

Power Meter Double Rates, Power Meter Two Rates, Cost Rate Socket, Power Meter Cost Rate, Energy Meter Cost Rate, Cost Socket, Cost Plug

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