i'm working on my graduation project and I face the subwoofer box calculation obstacle...?

[monka12]

hello, guys
I'm working on my graduation project and I face the subwoofer box obstacle, I'm a computer science engineer student but my project need this so, I need help with how to calculate the subwoofer box and which the best design is more efficient for my project criteria :

• the speaker should be inside the box
• speaker diameter: between 16 - 17 cm
• max box size : Length = Width = Height = 20 cm
• min decibel: 90

design should be like this

or like this

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I have this amplifier is will work for me ?

Pyle PLMRMP1A

• 2 x 100 Watts RMS at 4 Ohms
• 2 x 200 Watts Max at 4 Ohms
• 2 x 300 Watts RMS at 2 Ohms
• Stereo to RCA Adapter
• Fuse: 10A
• RCA Line Input
• T.H.D: <0.05%
• Soft Turn On/Off
• S/N Ratio: >95dB
• Anti-Thump Turn-On
• 2 Ohms Stereo Stable
• Power Protection Circuitry
• Channel Separation: >65dB
• Volume Gain Remote Control
• Electronic Crossover Network
• Remote Control for Volume Gain
• Adjustable High Low-Level Inputs
• Frequency Response: 10Hz - 40kHz
• Dimensions: 4.13'' L x 3.35'' W x 1.38'' H

THANK YOU SO MUCH !!!

 

[PRR]

So a 6.5" speaker and NO frequency response requirement? 90dB "SPL" is not a complete spec but does not imply anything special. Always use all the space you are allowed. Do not fool with a port until you prove a sealed box won't met the specs (you don't have).

Don't do spheres, domes, nautilus-shells unless you are selling to over-rich people. They may have some sonic benefit, but this is for a degree, not a hi-fi empire.

A 6.5" in an 8"x8"x8" box is a fair fit (for speakers a-round 1% efficient), will probably be fairly flat to 100Hz, will probably need 1 Watt to reach 90dB SPL "somewhere", and you have a hundred Watts. Throw in a wool sock for damping. I think the design is done?

 

[monka12]

So a 6.5" speaker and NO frequency response requirement? 90dB "SPL" is not a complete spec but does not imply anything special. Always use all the space you are allowed. Do not fool with a port until you prove a sealed box won't met the specs (you don't have).

Don't do spheres, domes, nautilus-shells unless you are selling to over-rich people. They may have some sonic benefit, but this is for a degree, not a hi-fi empire.

A 6.5" in an 8"x8"x8" box is a fair fit (for speakers a-round 1% efficient), will probably be fairly flat to 100Hz, will probably need 1 Watt to reach 90dB SPL "somewhere", and you have a hundred Watts. Throw in a wool sock for damping. I think the design is done?

thank you so much for your reply! but what is the sonic benefit of the sphere design, and if the first design is satisfied how can I calculate it? and is the ampli good for me knowing that the power supply criteria is 12v car battery?

 

[monka12]

hello, guys
I'm working on my graduation project and I face the subwoofer box obstacle, I'm a computer science engineer student but my project need this so, I need help with how to calculate the subwoofer box and which the best design is more efficient for my project criteria :

• the speaker should be inside the box
• speaker diameter: between 16 - 17 cm
• max box size : Length = Width = Height = 20 cm
• min decibel: 90

• 12v car battery

design should be like this

View attachment 1021295View attachment 1021296

or like this

View attachment 1021298View attachment 1021300


-------------------------------------------------------------------

I have this amplifier is will work for me ?

Pyle PLMRMP1A

• 2 x 100 Watts RMS at 4 Ohms
• 2 x 200 Watts Max at 4 Ohms
• 2 x 300 Watts RMS at 2 Ohms
• Stereo to RCA Adapter
• Fuse: 10A
• RCA Line Input
• T.H.D: <0.05%
• Soft Turn On/Off
• S/N Ratio: >95dB
• Anti-Thump Turn-On
• 2 Ohms Stereo Stable
• Power Protection Circuitry
• Channel Separation: >65dB
• Volume Gain Remote Control
• Electronic Crossover Network
• Remote Control for Volume Gain
• Adjustable High Low-Level Inputs
• Frequency Response: 10Hz - 40kHz
• Dimensions: 4.13'' L x 3.35'' W x 1.38'' H

THANK YOU SO MUCH !!!