Beast speaker for my headphone project

[Javid.zare.s]

Hi
I wanna know which speaker is ideal for my head phone , the one with transparent cone or black cone,im looking for the perfect bass,
or this


Both 8 ohms 0.5 watts (5.8 cm)
Amplifier tda2822

 

[Audioguru]

A fairly cheap small speaker has a resonant frequency of about 400Hz, below which its response drops about 12dB per octave, so no deep bass. The enclosure will increase the resonant frequency and cut bass sounds even more. Name Brand headphones use speakers that are made to be used in headphones and produce deep bass sounds because they have no resonant frequency.
The difference is that a cheap speaker is fairly loud at frequencies above its resonant frequency but a headphones speaker has a faint sound when used as a speaker.

I looked at the spec's of mini speakers at Parts Express and their cheapest ones have no spec's.

The TDA2922 amplifier is not hifi and might produce too much noise (hiss) to be used as a headphones amplifier.

 

[c_mitra]

headphones use speakers that are made to be used in headphones and produce deep bass sounds because they have no resonant frequency..

The statement is not accurate.

The natural resonant frequency depends on the elastic property (stiffness of the cone) of the material and the mass (heavier, the lower) of the moving part and depends on a complicated way on the geometry. All materials have their characteristic natural frequency (e.g., mother earth, if you can hang her on a rope and strike with a hammer, will have a natural frequency of vibration of about 24 hours) but it can be pushed to another value by design.

Increasing the mass is apparently the easiest solution but only at the cost of the conversion of electric energy into sound energy. Most manufacturers use innovative ways to shift the resonant frequency to lower and lower values. The damping of the resonance is rather complex (I do not understand all of that) but lot of progress has been made.

 

[BradtheRad]

To get strong bass, I find it is crucial to press the headphone close to my ears, as well as to have a foam cushion seal. A spring-tension headband is good to have.

I purchased a bargain pair of headphone transducers. They are much different from your photographs of speakers. Mine are about an inch diameter. The diaphragm is thin transparent mylar. The mylar side is open faced. The opposite side is solidly sealed, allowing no sound to escape that side.

 

[c_mitra]

I purchased a bargain pair of headphone transducers. They are much different from your photographs of speakers. Mine are about an inch diameter. The diaphragm is thin transparent mylar. The mylar side is open faced. The opposite side is solidly sealed, allowing no sound to escape that side.

These transducers have shifted the resonance frequency towards the high frequency end and they will have decent low frequency response. The sealed end also improves the stiffness of the diaphragm.I do not know the exact details but these appear to be the modern styles.

 

[Javid.zare.s]

A fairly cheap small speaker has a resonant frequency of about 400Hz, below which its response drops about 12dB per octave, so no deep bass. The enclosure will increase the resonant frequency and cut bass sounds even more. Name Brand headphones use speakers that are made to be used in headphones and produce deep bass sounds because they have no resonant frequency.
The difference is that a cheap speaker is fairly loud at frequencies above its resonant frequency but a headphones speaker has a faint sound when used as a speaker.

I looked at the spec's of mini speakers at Parts Express and their cheapest ones have no spec's.

The TDA2922 amplifier is not hifi and might produce too much noise (hiss) to be used as a headphones amplifier.

What? Tda ic is noisy???????? Oh sh**
What should i do nowww is there any way to prevent this? Can i use lm386 for each voice chanel?(cause i have it right now)

- - - Updated - - -

To get strong bass, I find it is crucial to press the headphone close to my ears, as well as to have a foam cushion seal. A spring-tension headband is good to have.

I purchased a bargain pair of headphone transducers. They are much different from your photographs of speakers. Mine are about an inch diameter. The diaphragm is thin transparent mylar. The mylar side is open faced. The opposite side is solidly sealed, allowing no sound to escape that side.

So if i seal the back side of current speaker itll boost bass ? Seal like beats head phones?:

My current speaker diameter is 3.7 cm like in picture

 

[Audioguru]

What? Tda ic is noisy???????? Oh sh**
What should i do nowww is there any way to prevent this? Can i use lm386 for each voice chanel?(cause i have it right now)

Most power amplifiers are made to drive a loudspeaker that is fairly far away from your ears then you do not hear their noise. But a TDA2822 or an LM386 have too much noise to be used for headphones that are very close to your ears. Try it, maybe it will be OK because some ICs have less hiss than others.

So if i seal the back side of current speaker itll boost bass ? Seal like beats head phones?

When a headphone speaker has its back sealed then it is designed to be sealed. If you seal the back of an ordinary little speaker then it will look like and sound like a tweeter with no bass.

 

[Javid.zare.s]

Most power amplifiers are made to drive a loudspeaker that is fairly far away from your ears then you do not hear their noise. But a TDA2822 or an LM386 have too much noise to be used for headphones that are very close to your ears. Try it, maybe it will be OK because some ICs have less hiss than others.


When a headphone speaker has its back sealed then it is designed to be sealed. If you seal the back of an ordinary little speaker then it will look like and sound like a tweeter with no bass.

Ok ill try it ,wish me luck , ����
So I'll not close the back of my speaker����

 

[c_mitra]

So I'll not close the back of my speaker����

If the speaker is already mounted in a box (closed box) then its back is also closed automatically. You need to paste some sponge (sound absorbing materials) on the inside walls of the box.

If the speaker is not mounted at all, it will sound horrible because of the interference (front and back) of the sound waves. The speaker cone separates the front and back effectively and must be mounted with air seal.

Everytime the cone moves forward, it creates a compression wave in front and a rarefaction wave in the back. If these two different waves are allowed to interfere, they will cancel (phase permitting) each other.

 

[Javid.zare.s]

If the speaker is already mounted in a box (closed box) then its back is also closed automatically. You need to paste some sponge (sound absorbing materials) on the inside walls of the box.

If the speaker is not mounted at all, it will sound horrible because of the interference (front and back) of the sound waves. The speaker cone separates the front and back effectively and must be mounted with air seal.

Everytime the cone moves forward, it creates a compression wave in front and a rarefaction wave in the back. If these two different waves are allowed to interfere, they will cancel (phase permitting) each other.

It was closed but not sealed , lot of sound could escape from it, every body can hear what im listening to... That's terrible...

 

[c_mitra]

closed but not sealed , lot of sound could escape from it, every body can hear what im listening to...

You need to put some sound absorbing foam interlining...

Quality of sound will improve immediately...

 

[Audioguru]

A speaker mounted on a wall so that its front plays to you and its rear plays to outdoors or to another sealed room has an infinite baffle size and resonates at its free air resonant frequency. Rear shelf car speakers use the entire trunk (boot?) of a car as a huge infinite baffle.
A speaker in a sealed enclosure has its resonant frequency increased by the size of the enclosure for its rear sound. Sound absorbing material in the enclosure stops some mid frequency reverberation and heats a little which allows the sealed enclosure resonant frequency increase to be a little less.

I do not know if your headphone speakers will have a sealed rear like a tweeter or have an enclosure at the rear, since you do not want an infinite baffle that allows everybody near you to hear the rear sound.