Technical parameters of active speakers

< tr> There are many technical parameter items for active speakers, and the following are the most meaningful for readers to buy and use:

1: Power

Power can be said to be the most meaningful and meaningless parameter. It is most meaningful because it directly determines the maximum effective output sound pressure level (commonly understood as the maximum volume) and low-frequency quality of the speaker. And it is the most meaningless because there are more than a dozen kinds of power parameters. At present, many manufacturers on the market have abused the concept of "peak power" extremely, making the originally very reusable parameters meaningless. .

The power parameters related to active speakers mainly include the following:

(1) Power amplifier part: The output power of the power amplifier is the one that has the most changes (or is greasy) among various parameters. The output power measured by the same power amplifier is different due to different test methods. The common ones are the following.

● Rated output power: refers to the maximum power that the power amplifier can continuously output within the rated total harmonic distortion range, which can also be called effective value power or root mean square (RMS) power.
● Peak power (P max): Because the maximum value of the positive-swept AC voltage is 1.414 times the effective value. Therefore, the peak power (P max) is twice the root mean square power (P rms).
● Music output power (MPO): refers to the instantaneous maximum output power of the power amplifier to the music signal under the condition that the output distortion does not exceed the specified value, referred to as MPO.
● Peak music output power (PMPO): refers to the instantaneous maximum power that the power amplifier can output without considering the distortion. The peak music output power is generally 5-8 times the root mean square (RMS) power.

For users, the only thing that really makes sense among the above output powers is the rated output power. Only at this power, the power amplifier can continuously output music signals without (low) distortion. This is the real power. Generally not big. Due to the direct correlation between output power and cost, many low- and mid-range speakers are calculated in (RMS), and their output power is pitifully small, and they lack the temptation to ignorant customers, so many manufacturers evade the rated output power. Among these types of power, the most boring is the peak music output (PMPO) power. Its test conditions are to relax the distortion limit and extremely short moments (usually in milliseconds). In fact, who can tolerate sound without distortion, and what kind of music lasts only a few milliseconds? Therefore, for practical use, this kind of power is meaningless, but it is abused by profiteers. It is no wonder that some people call it JS (profiteer) power.

Most active speakers currently use power amplifier integrated circuits. Therefore, if you want to know the maximum output power of the active speaker (referring to the power amplifier part, not including the power supply), you only need to find out the model of the power amplifier integrated circuit used. The parameters of some commonly used power amplifier integrated circuits are listed below for reference:
model Power (w) / distortion / impedance (Ω) Power / distortion / impedance Manufacturer Recommendation (5 stars)
TDA1521 / 2616 12 x 2/1% / 8 15 x 2/10% / 8 Philips ★★★
TDA2030A 12 / 0.5% / 8 18 / 0.5% / 4 ST ★★
TDA7269 10 x 2/10% / 8 ST ★★★
TDA7370 6.5 x 4/10% / 4 ST ★
TDA7294 70 / 0.5% / 8 100/10% / 8 ★★★★
LM1875 20 / 0.015% / 8 25/1% / 8 NS ★★★★
LM1876 20 x 2 / 0.1% / 8 NS ★★★
LM3886 50 / 0.1% / 8 68 / 0.1% / 4 NS ★★★★

Note: ST's original TDA2030A is a very good power amplifier IC, but most manufacturers use their compatible models, and the sound quality and reliability are not as good as the original products, so only two stars are given in the recommendation.

(2): Speaker rated withstand power: No matter how high the power of the amplifier is, the speaker can't bear it is also a white. This is also an important factor restricting the actual output power of active speakers.

(3): Power supply effective output power: usually refers to the rated output power of the power transformer, which is a very important parameter. Because most power amplifier integrated circuits work in Class A and B states, the output power of the power amplifier generally does not exceed 70% of the power output power.

For an active speaker system, its output power is determined by the smallest of the above powers (typical bottleneck effect). If no more information can be found, the effective output power can also be estimated based on the price of the speaker. According to experience, the effective output power of low-end (less than 500 yuan) active speakers generally does not exceed one-tenth of its selling price (units are watts, not counted as slaughter), and high-end (more than 500 yuan) active speakers The effective output power generally does not exceed 15 to 20 times of its selling price. This empirical value is relatively accurate in most cases, because the loss-making traders will not do it. For general multimedia applications, it is basically sufficient to have 5-10 watts of power speakers per channel. If you have high requirements for sound quality, it is recommended to buy active speakers with more than 20 watts per channel.

2: S / N ratio:

The signal-to-noise ratio refers to the ratio of the maximum undistorted output voltage of the power amplifier to the residual noise voltage. The unit is decibel. It is a parameter that reflects the noise level of the active speaker, and it is also an important sign that reflects the design and manufacturing level of the active speaker manufacturer. Speakers with low noise may not sound good, but speakers with high noise must not be good. The signal-to-noise ratio must be at least 75 decibels or more to have a good playback effect. You can unplug the signal cable and turn the volume to the maximum when purchasing. If you can't hear the noise outside 20 cm, you can pass the level.

3: Frequency range:

The frequency range of the sound that can be directly heard by the human ear is about 20-20000Hz. With today's speaker technology, it is no problem to reach a high frequency of 20,000Hz, but it is very difficult to extend the low frequency end to 20Hz without distortion. Most The frequency range of low- and mid-range active speakers is about 100-16000Hz, and the frequency range of high-end active speakers is up to 50-20000Hz. Active speakers with a general frequency range of 80-16000Hz can be qualified for ordinary multimedia applications. If you have higher requirements for sound quality or for movie appreciation, it is recommended to purchase a lower limit of low frequency that can be extended to 40-50Hz, and high frequencies can be extended straight Active speakers up to 20000Hz. The parameters of the frequency range can be found in the product's publicity materials, but the indicators of some manufacturers are seriously untrue. Some speakers with only one or two hundred yuan dare to mark the frequency range to 20-20000Hz, but in fact they can be straight and not Loudspeakers that replay this frequency range with distortion can't find a few pairs in the world, so don't take it seriously. Readers can bring some records that are rich in high and low frequencies and familiar with them when they buy, and they can also use test CDs or test software with standard frequency signals such as "Davids Audio Sweep Generator" or "Audio100 Audio" Tester "audio tester software for testing.

The world premiere of the technical zone! ROHM has developed the power supply IC "BD372xx series" for high-quality audio. A practical guide for the purchase of home wireless routers. Understanding the circuit diagram and working principle of the audio. Talking about the "frequency response curve" in the audio. Deep dismantling report of the M0pro speaker: both internal and external

Follow WeChat

Interesting and informative information and technical dry goods

Download Audiophile APP

Create your own personal electronic circle

Follow the audiophile class

Lock the latest course activities and technical live broadcast
Collect People collection
share it:
comment
Publish

related suggestion

Change active speakers to passive speakers

Active speaker: Built-in power amplifier circuit, can work when connected to power supply and signal input. Passive speakers: There is no power amplifier circuit inside, you need an external power amplifier ...

Published on 2018-01-22 13:37 • 455 times read
Change active speakers to passive speakers
What are active speakers and passive speakers_The difference between active speakers and passive speakers is ...

Active speakers are also called "active speakers". Usually refers to speakers with power amplifiers, such as multimedia computer speakers, active subwoofers, and some ...

Published on 2018-01-22 13:32 • 353 times read
What are active speakers and passive speakers_The difference between active speakers and passive speakers is ...
Household 2.1 transparent active wireless speakers are cost-effective and cost-effective!

Transparent design can be said to be a very premium design in the field of speakers. For example, manufacturers such as Harman Kardon and JBL have launched similar products ...

Published on 2016-11-09 15:09 • 388 times read
2.1 transparent active wireless speakers for home use
Built-in microcomputer active speaker

The author recently made a cheap computer active speaker, which not only meets the above functional requirements, but also can be built into the case and turned on at a volume ...

Posted at 2012-04-11 17:31 • 1258 views
Built-in microcomputer active speaker
Design of wireless active speaker based on BC03 Bluetooth module

The main task of the program is to complete the communication and control with the Bluetooth module through the C8051F020 MCU UART0, to achieve a Bluetooth mobile phone or PC ...

Posted on 2011-09-21 11:11 • 1781 times read
Design of wireless active speaker based on BC03 Bluetooth module
Production of SRS active antimagnetic speaker

SRS (that is, SOUND RETRIEVAL SYSTEN, is the English abbreviation of the sound reduction system) is the US SRS laboratory ...

Posted on 2010-12-28 12:33 • 1765 times read
Production of SRS active antimagnetic speaker
A HI-FI active integrated speaker

The active integrated speaker is the stereo Suzhou and the power supply are all installed in one speaker, and the active speaker is connected to another passive speaker to achieve stereo sound

Posted on 2010-12-28 12:13 • 4671 views
A HI-FI active integrated speaker
Self-made multimedia active speakers

Circuit principle: The circuit is shown in Figure 9-68, TDA1524A is mainly suitable for HI-FI sound system for DC volume tone balance ...

Published on 2010-12-28 11:07 • 7027 views
Self-made multimedia active speakers
Circuit diagram of a cost-effective active speaker

With the gradual improvement of the living standards of material culture, people have put forward higher requirements for the high-fidelity reproduction of music. A set of hair with excellent performance and beautiful sound quality ...

Posted at 2010-12-28 10:44 • 4825 views
Circuit diagram of a cost-effective active speaker
Production of high-performance active anti-magnetic speaker

The ever-changing audiovisual technology and the multimediaization of home computers have greatly satisfied people's needs in entertainment and culture. Audiovisual integration has become a kind of ...

Published on 2010-12-28 10:23 • 2021 views
Production of high-performance active anti-magnetic speaker
Circuit diagram of tube active speaker

At present, most of the power amplifiers in active speakers use transistors or integrated circuits. The active speakers made with tube power amplifiers are almost

Posted on 2010-12-28 09:46 • 6112 views
Circuit diagram of tube active speaker
Bookshelf Active Speaker

Due to the beautiful sound effect, the single player has gradually become a pet in the hands of many young friends, especially now with the advancement of technology and the improvement of people's appreciation ability ...

Posted at 2010-12-27 17:04 • 1591 views
Bookshelf Active Speaker
Production circuit diagram of low power electronic three-way active speaker

The low-power electronic three-way active speaker introduced in this article has the advantages of small size, flexibility and excellent sound quality. It is very suitable for music hobbies that are not wide in the room.

Posted at 2010-12-25 17:32 • 6310 views
Production circuit diagram of low power electronic three-way active speaker
Active speaker circuit diagram

The compact stereo player has the advantages of easy portability and good stereo effect, so it is deeply loved by the majority of music lovers. But its output power

Posted at 2010-11-21 17:25 • 7799 times read
Active speaker circuit diagram
Suspended active speaker overview

The so-called floating active speaker refers to an active source made directly on the circuit by using commercial power as a high voltage and using a reference point on the potential to isolate external equipment ...

Published on 2010-10-27 12:19 • 872 views
Suspended active speaker overview
LED technical parameter symbol introduction

LED technical parameter symbol introduction CT --- barrier capacitance Cj --- junction (between poles) capacitance, indicating at both ends of the diode ...

Posted on 2010-05-08 08:49 • 992 views
LED technical parameter symbol introduction
What are active speakers and passive speakers

What are active speakers and passive speakers Active speakers (Active Speaker) is also known as "active speakers." Usually refers to the belt ...

Posted at 2009-12-28 10:56 • 2764 times read
What are active speakers and passive speakers
Production of active speakers

Active speaker is an organic combination of power amplifier and passive speaker, which is widely used in multimedia ...

Published on 2006-04-17 23:36 • 2501 views
Production of active speakers
73 kinds of commonly used rectifier diode technical parameters

model

Posted at 2006-04-17 21:32 • 2867 views
73 kinds of commonly used rectifier diode technical parameters
var check_allow = "/d/Api/iscantalk.html"; var add_url = '/ d / article / write /'; function CheckLogin () {now_uid = ''; var ElecfansApi_checklogin = '/ webapi / passport / checklogin'; var logout_url = "{: U ('Login / logout')}"; var logout_url = 'http://bbs.elecfans.com/member.php?mod=logging&action=logout&refer=front'; $ .get (ElecfansApi_checklogin, function (data, textStatus) {if (data! = "") {EchoLoginInfo (data); CheckEmailInfo (data); data = $ .parseJSON (data); now_uid = data.uid; / * var login_content = 'write an article
'+ data.username +'
Quit '; * / var login_content =' write an article
'+ data.username +'
Set exit '; $ (' # login_area '). Html (login_content); var win_width = $ (window) .width (); if (win_width> 1000) {$ ("# mine"). MouseDelay (200) .hover (function () {$ ("# mymenu"). show ();}, function () {$ ("# mymenu"). hide ();});}} else {var content = 'Login Registration'; $ ('# login_area'). html (content); $ (". special-login"). click (function (e) {$ .tActivityLogin (); return false;});}});} $ (function () {// comment ------------------------------- var comment = $ ("# comment"); var comment_input = $ ("# comContent"); // Submit comment click event interaction $ ("# comSubmit2"). on ('click', function () {var content = comment_input.text (); // Empty input box comment_input. html (""). focus (); // Submit data to server $ .ajax ({url: '/plus/arcComment.php', data: {aid: $ ("# webID"). val (), dopost : 'apiPubComment', content: content}, type: 'post', dataType: 'json', success: function (data) {// Data format returned: if (data.status == "successed") {// Build temporary comment DOM var dom = ''; dom + = '
'; dom + =' '; dom + ='
'; dom + ='

'+ data.data.username +' '; dom + ='

'; dom + =' '+ content +' '; dom + =' '; dom + =' just now '; dom + =' '; dom + =' '; // insert a temporary comment to the list $ ("# comment ") .append (dom);} if (data.status ==" failed ") {// alert (data.msg); layer.msg (data.msg);}}}); return false;}); (function () {/ * * Insert single sign-on JS * / var setHost = 'https://passport.elecfans.com'; // Set domain name var script = document.createElement ('script'); script.type = 'text / javascript'; script.src = setHost + '/public/pc/js/t.passport.js'; script.setAttribute ("id", "sso_script"); script.setAttribute ("data-ssoSite", setHost); script.setAttribute ("data-ssoReferer", encodeURIComponent (location.href)); script.setAttribute ("data-ssoSiteid", "11"); var body = document.getElementsByTagName ("body"). item ( 0); body.appendChild (script);}) () / * * It is recommended to modify the style of the article without a picture * * / $ (". Article .thumb"). Each (function () {if ($ (this). find ('img'). attr ('src') == "") {$ (this) .find ('img'). remove (); $ (this) .parent (). css ('padding-left ',' 0px ');}}); / * Baidu share * / window._bd_share_config = {common: {bdText: '', // Custom share content bdDesc: '', // Custom share summary bdUrl: window.location.href, // Custom share URL address bdPic: ''} , share: [{"bdSize": 60, "bdCustomStyle": true}]} with (document) 0 [(getElementsByTagName ('head') [0] || body) .appendChild (createElement ('script')). src = 'http://bdimg.share.baidu.com/static/api/js/share.js?cdnversion=' + ~ (-new Date () / 36e5)]; var add_url = '/ d / article / write / '; // var check_allow = "{: U (' Api / iscantalk ')}"; var check_allow = "/ d / api / iscantalk"; var click_items_length = $ ('. art_click_count '). length; if ( click_items_length> 0) {var id_str = ''; $ ('. art_click_count'). each (function () {id_str + = $ (this) .attr ('data-id') + ',';}) // var url = "{: U ('Api / getclickbyids')}"; var url = "/ d / api / getclickbyids"; var id_data = 'id_str =' + id_str; $ .ajax ({url: url, data: id_data, type: 'post', dataType: 'json', success: function (re) {if (re.list.length> = 1) {var list = re.list; for (var i in list) {var t emp_id = list [i] ['id']; var temp_span = $ (". art_click_count [data-id =" + temp_id + "]") temp_span.html (list [i] ['click']);}} }})} $ ("# comContent"). click (function () {if (now_uid == '') {$ .tActivityLogin (); return false;}}) $ (function () {var follow_wrap = $ ( ".author-collect"); var now_uid = "{$ _super ['uid']}"; var face_src = "{$ _super ['uface']}"; var getFollowNum = $ (". followNum strong"). html (); // Follow $ (window) .on ('click', '.author-collect', function () {if (now_uid == '') {$ .tActivityLogin (); return false;} if ( $ (this) .attr ('id') == 'follow') {$ .post ('/ d / user / follow', {tuid: article_user_id}, function (data) {// Data format returned: if (data.status == "successed") {$ (". followNum strong"). html (++ getFollowNum); follow_wrap.html ('followed'). attr ('id', 'cancelFollow'). css ( 'background', '# 999'); var follow_user = ' '; $ (' # follow_list '). append (follow_user);} if (data.status == "failed") {alert (data.msg);}});} else {// Unfollow if ($ ( this) .attr ('id') == 'cancelFollow') {$ .post ('/ d / user / cancelFollow', {tuid: article_user_id}, function (data) {// Data format returned: if (data .status == "successed") {follow_wrap.html ('Follow'). attr ('id', 'follow'). css ('background', '# f90'); $ (". followNum strong"). html (-getFollowNum); $ ('# follow_list .face'). each (function () {var target_uid = $ (this) .attr ('data-uid'); if (target_uid == now_uid) {$ ( this) .remove ();}})} if (data.status == "failed") {alert (data.msg);}}); return false;}}});});}); / * var myface = "{$ _super ['uid'] | avatar}"; var myname = "{$ _super ['username']}"; var article_id = {$ article ['id']}; var article_user_id = {$ article ['mid']}; // Article author ID $ (function () {<notempty name = "clearnum"> // Reduce the number of reminders var count = parseInt ($ ("# noticeCount"). html ()); count = count-{$ clearnum}; $ ("# noticeCount"). html (count); if ( count

Transparent Led display screen

 Transparent Led Display  is a creative design and upgrade version of outdoor Led Display Screens . It is made by DIP Led strip.

products have features of light weight, energy-saving, high transparency, fast installation and easy maintenance. With advanced and top level of led diode , Priva Led's Outdoor Transparent Led Display  have low power consumption and high brightness. In this ways, It is very stable and durable during lifetime.

1 

2 

For better understanding Led Curtain Display main advantages,

High Water-Proof grade applied with IP65 water-proof standard, make your screen working perfectly without problems even in heavy rain.

3 

Light-weight cabinet The cabinet is about 5-8 KG per square meter, 60% less weight compared with traditional tile and have greatly reduce the load bearing pressure of the structures.

4 

High transparency rate   Louver design, make the transparency rate up to 72%, and this design greatly satisfied people`s curiosity to see outside from inside. 

 

 

5 

 

High brightness8000nits for P25, could be used absolutely for outdoor under strong sunshine.

6 

Fast & easy installation No need steel structure,  Solid and simple assemble style, make installation and maintenance quick and easy. It stands firmly even in big wind.

7 

 

 

Installation Steps

Installation Steps

 1    Fitting the steel structure: fitting it on the wall firmly

8 

  2    Attach the U-Tile frame to the structure firmly     

9 

3Lock the frame on the structure by screws

10 

 

4Hanging the upper right hooks of the cabinet to the card slot of the right U-tile Frame.

 

11 

5

Buckle the left position pins of the cabinet to the location holes of the left side of the U-tile frame

12 

6 Aim at the screw holes for the front service installation, fitting 6 screws on the U-tile frame through the cabinet from the front.

(This is a procedure of front service, this cabinet support also available for back maintenance)

13 

 

14 

7 Then finished installation for one cabinet. The same as the next cabinet.

8 Cable Connection.

Connect the male-plug (with cable) of the next cabinet to the female-plug of its upper cabinet firmly.

15 

9 Using the same mode to finish the rest connection (five-pins cable), then the installation work for a complete LED display is finished.

16 

 

After-sale maintenance

 1 The cabinet support single trip maintenance. If there any bad LED lamp or damage on single strip, you can remove the strip separately without take out the cabinet and control box.
17

2, Cabinet support front & back installation and maintenance. If there any problem on single cabinet, you can remove the cabinet from the front & back of the screen.

18 

 

3 ,If there damages on the control box, you need remove the cabinet and open the cover of the power supply box to do repair & exchange work.

19 

 

 

Cabinet size:

20 

 

Package: Wooden case  1 for 10 LED strip curtain cabinets.

Package size:

21 

 

This outdoor Led Strip Curtain  display series product are widely used for building facade, behind of glass wall, in front of glass wall, led billboard& signs and on top of building.

Welcome to visit our factory in Nansha Guangzhou China. Please contact us for any questions or inquiries!

Led curtain display Parameter

Model number          

Pixel pitch              

Pixel configuration

Size of block module

Resolution of module

Density

Cabinet material

Size of cabinet(l*h*t)

Weight of cabinet

Driving method

Best viewing angle

Max power consumption

Colors

Gray scale

Color temperature

Control method

Driving device

Frame frequency

Refresh frequency

Brightness

Working voltage

Working temperature

Out-of control point

Brightness Control

IP grade

Mtbf

Transparency

Transparent LED Display

Led Curtain Display,Outdoor Led Curtain For Building,Led Curtain Wall Display,Led Strip Curtain

Shenzhen Priva Tech Co., Ltd. , https://www.privaled.com