Hi all,
I;m new to the DIY community. I wanted to build a DIY loudspeakers and I'm still a beginner and in the learning curve. I will not build the speaker yet, just learning the basics.
I'm trying to understand the benefit of having 2 (mid Woofer instead of one). Let's use the next Example.
Loudspeaker A:
- 1 tweeter
- 1 6.5" mid-woofer/range
- 1 7.5" mid-woofer
Loudspeaker B:
- 1 tweeter
- 1 6.5" mid-woofer/range
- 2 7.5" mid-woofers
I use WinISD to simulate the cabinet part for the woofer(s) only. I;m using 30L volume for loudspeaker A and B. Port is tuned for 32.5 Hz
I looks like speaker A go lower. The -3dB point is at 44Hz. The -3dB point of speaker B is at 57Hz.
I have added speaker C. This is a speaker with two drivers, with all the parameters equal to Loudspeaker B, but here I have make the volume bigger (55L). I have doubled the volume to 60L, the line will be the same as loudspeaker A.
How comes that the speaker doesn;t go lower, when I double the amount of drivers and volume? When I visit a listening room, the speakers with double woofers have much more bass (maybe not lower bass, but louder).
I have added a screenshot from WINISD.
Loudspeaker A = blue
Loudspeaker B = red
Loudspeaker C = green
I;m new to the DIY community. I wanted to build a DIY loudspeakers and I'm still a beginner and in the learning curve. I will not build the speaker yet, just learning the basics.
I'm trying to understand the benefit of having 2 (mid Woofer instead of one). Let's use the next Example.
Loudspeaker A:
- 1 tweeter
- 1 6.5" mid-woofer/range
- 1 7.5" mid-woofer
Loudspeaker B:
- 1 tweeter
- 1 6.5" mid-woofer/range
- 2 7.5" mid-woofers
I use WinISD to simulate the cabinet part for the woofer(s) only. I;m using 30L volume for loudspeaker A and B. Port is tuned for 32.5 Hz
I looks like speaker A go lower. The -3dB point is at 44Hz. The -3dB point of speaker B is at 57Hz.
I have added speaker C. This is a speaker with two drivers, with all the parameters equal to Loudspeaker B, but here I have make the volume bigger (55L). I have doubled the volume to 60L, the line will be the same as loudspeaker A.
How comes that the speaker doesn;t go lower, when I double the amount of drivers and volume? When I visit a listening room, the speakers with double woofers have much more bass (maybe not lower bass, but louder).
I have added a screenshot from WINISD.
Loudspeaker A = blue
Loudspeaker B = red
Loudspeaker C = green
Last edited:
You are looking at the transfer function screen in WinISD. With two identical drivers in a 2x size box, the transfer function (that is, the shape of the response curve) will be the same. Doubling the drivers does not make them play deeper.
If you click on "Transfer Function Magnitude" in the menu bar and switch to the SPL curve, you will see that the 2 driver version plays louder for the same signal input. Other displays will show you the higher maximum SPL with two woofers, the difference in power handling, the difference in the power delivered to the speakers because of the lower impedance of two drivers in parallel and so on.
A couple of bugs - WinISD will not handle drivers wired in series, and the Impedance tab does not reflect the correct impedance for doubled drivers. If you are using two drivers in parallel be sure your amp will handle the low impedance load.
Bill
If you click on "Transfer Function Magnitude" in the menu bar and switch to the SPL curve, you will see that the 2 driver version plays louder for the same signal input. Other displays will show you the higher maximum SPL with two woofers, the difference in power handling, the difference in the power delivered to the speakers because of the lower impedance of two drivers in parallel and so on.
A couple of bugs - WinISD will not handle drivers wired in series, and the Impedance tab does not reflect the correct impedance for doubled drivers. If you are using two drivers in parallel be sure your amp will handle the low impedance load.
Bill
"benefit of having 2 (mid Woofer" - evens out the floor bounce frequency dips, for more solid low mids
Thanks guys! That did the tric!
I have one more question. Which tool can I use to calculate the optimal box volume when I use two drivers/woofers? I can only find tools where I can do the calculation for one driver. Thanks in advance!
I have one more question. Which tool can I use to calculate the optimal box volume when I use two drivers/woofers? I can only find tools where I can do the calculation for one driver. Thanks in advance!
The only thing you achieve with two drivers in exact same setup is more power/SPL and more complicated impedance load for the amplifier. If you want deeper bass with two drivers you need to tune the cabinet size and ports differently and play around with 2,5 way crossover and baffle step.
I suggest you find a bigger LF driver instead and design a proper 3-way like 10” bass 5” mid and tweeter. Depending on your need of course (low-end response spl/power efficiency room amp music preference etc.).
I suggest you find a bigger LF driver instead and design a proper 3-way like 10” bass 5” mid and tweeter. Depending on your need of course (low-end response spl/power efficiency room amp music preference etc.).