Acoupower
The sound from two loudspeakers is received by a microphone at a point far away along the line …?
The sound from two loudspeakers is received by a microphone at a point far away along the line through the speakers. The microphone registers maximum intensity when the speakers are 20 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 44 cm. If the distance between the speakers continues to increase, at what separation will the sound intensity again be a maximum?
The distance to the micophone is given as ‘far away’ and therefore no allowance need be made for the increase in distance as the speaker is moved.
The separation of the trough and peak intensity is 44 minus 20 cm = 24cm which is the peak to zero distance.
44 + 24 = 68cm separation to the next peak.
68 + 24 = 92cm to the next zero
and so on
February 23rd, 2010
Posted by admin in loudspeakers | 1 Comment »
Is it possible to use Stereo speakers as loudspeakers for a PA system?
I found two large Jensen speakers in my house. They are supposed to be used for stereos. But is it possible to use them as speakers for a PA system for live music performances? If so, how? They do not have the proper plugs that plugs into pre-amps. Their plugs looks like two red and black slots.
Home stereo speakers are not designed for PA use. You will blow them out real quick if you attempt to use them for live music. When a PA speaker is designed, the main design priority is sound pressure level or SPL because you’re trying to cover a large audience. A home speaker is designed to resolve subtle passages in music. In other words, a home speaker is made more for accuracy and a wide frequency response. The PA speaker is made more robust and rugged for portability. The drivers and surrounds are much stiffer and they have bigger magnets and have large voicecoils to handle alot of power. They’re not made for accuracy. Their passive crossovers can also handle more power than a home speaker’s can.
February 3rd, 2010
Posted by admin in loudspeakers | 1 Comment »
articles or essays on why loudspeakers are a nuisance during festivals?
please tell me where to find info on this topic
Noise pollution articles.
January 23rd, 2010
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what would be the current replacement value of a set of B&W DM220 loudspeakers in excellent condition ?
Replacement value? Check with a hi-fi dealer. Depreciated value? Check this recent eBay auction for an idea.
WK
January 16th, 2010
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Do you find church bells as annoying as prayers be broadcast from mosque loudspeakers?
I like them, especially wedding bells.
January 13th, 2010
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Loudspeakers: Why are bass speakers way bigger than trebble speakers?
I´ve noticed that loudspeakers have two sets of woofers, one for bass and one for trebble. Why is it that the bass speaker is bigger than the trebble speaker?
Please provide tspecific answers. Answers like "bass waveforms are bigger" dont really help at all.
Thanks!
It does have to do with the relationship between the size of the speaker cone and the length of the sound wave, and something called acoustic impedance. Here’s my conceptual understanding of it:
Sound is rapid fluctuations in air pressure, high pressure / low pressure / high pressure… etc. These travel out from the source as waves. The loudness of a sound depends on the sound pressure level, which is the difference between the highest pressure in the wave and the lowest pressure in the wave.
OK, let’s say you have a speaker cone. If you drive it with an audio signal it will move back and forward. When it moves out, it squeezes the air in front of the cone, causing a high pressure wave peak, when it moves in again it causes a low pressure wave trough. Now of course the speaker cone is open to the air, and air is free to move, so when the cone moves outwards to create the high pressure peak some of the air will just move out of the way.
However, air can only move so fast. If you drive the speaker at a very fast rate (high frequency) the air doesn’t have time to get out of the way, so you get a big difference in pressure between peak and trough. Big difference in pressure = loud sound. If you drive it at a slow rate (low frequency) the air has time to move, to equalise the pressure between in and out parts of the cycle, so you get a small difference in pressure, which equals a quieter sound.
Now if you use a bigger speaker cone, the air has further to go in order to get out of the way, so you can still get a good sound pressure level from it.
Now, you may ask, why doesn’t a good bass speaker produce an even louder treble (high frequency) sound? It is because you need energy to accelerate a mass, like a speaker cone. The higher the frequency, the greater the acceleration, and the more energy you need to move it. A big speaker doesn’t work well at high frequencies because there is not enough energy available in the electrical signal to move the cone very fast.
January 7th, 2010
Posted by admin in loudspeakers | 5 Comments »
My music systems loudspeakers sound started deteriorating & now very less bad sound?
so where’s the problem???
i have original SONY speakers which is decade old
plug some different speakers in to your system that will tell you if it is your system or speakers relpace what isn’t working
November 19th, 2009
Posted by admin in loudspeakers | 1 Comment »
how do you repair loudspeakers,ie when the coil has burnt out?
Simple. You don’t
You buy new speakers
November 13th, 2009
Posted by admin in loudspeakers | 5 Comments »
can i buy loudspeakers for my laptop that would be really really really loud?
all you need is a speaker set. I got a 5.1 surround sound set from futureshop last year for 50$.
just plugs into the headphone port of the laptop.
any powered speaker set would work
November 2nd, 2009
Posted by admin in loudspeakers | 5 Comments »
Do loudspeakers deterioriate with age and lose sound quality?
Sure — some more quickly than others, depending on the material they’re made of. Speakers VIBRATE, and so they "decompose" over time. However, superior quality speakers can last many, many years.
October 25th, 2009
Posted by admin in loudspeakers | 2 Comments »