Help with box designing.

[viki_v2]

Hello Friends.
I have made MDF box for my 3 way speakers Box Volume 58 Liters. Nothing added for damping . Kindly guide if this the proper volume.
I am facing a certain problem while playing these speakers. When playing Music If I am front of the speakers 7 to 8 ft from speakers. it sounds very punchy and tight, But seems to miss the depth. But if I go to corner of the room or across the speakers, there is good deep bass with the punch and tightness. Earlier I made down firing port , then Changed to rear firing port tube dimensions 3" wide and 6" deep

I have a custom made crossover made by a friend. But I want to make a crossover properly.

Please guide and help

[ocih]

i thing your port is to long. use 3" wide, 3,5" deep. Because bass have long lambda, it is normal if u can hear a good bass in the corner.
For better result change the placement of your box
hope this can help

[Jay]

Before you change anything, try to seal the box (close the port) and listen. Not sure about you, but I believe that I will prefer the sound of this simple modification.

[picowallspeaker]

Originally Posted by viki_v2

Nothing added for damping .

Strange ,very strange .
Or you did mean stuffing
Maybe , it was better to keep the port firing downwards ,as there were no cabinet walls in the vicinity of the inner duct port .
Then , it would have allowed to make some 'fine tuning' by changing the height from the floor 8
(1-3 inches).

[Jay]

I agree with ocih. It seems you need to know a little about the effect of room and wall reflection to bass reinforcement. If the port is on the back, 0.5m from wall is good (optimize between bass boominess and space availability).

Picowallspeaker,

Are you sure 1-3 inches is fine. This is not subwoofer. The F3 will not lower than 40Hz in my prediction.

Stuffing and bracing the box is surely better.

You can reduce the port length. It is good if you have 3 ports. One port 6", one port 5", one port 4". If you prefer 4" to 5", cut the 5" to 3.5". If you prefer the 4" to 3.5", cut the 6" to 4" and throw away the 3.5"

If you seal the box, the bass response will roll off sooner, but more gradually so you will have the impression of deep bass. And you will get good transient and controlled bass. It depends on your taste.

[picowallspeaker]

Stuffing 'makes see' a larger box to the loudspeaker ,hence lowering Fb , in conjunction with the natural low-pass action of the port , putting it on the bottom and calculating it a little shorter allows also a minimum gain of bass frequencies ...
But stuffing a reflex box is the most important thing to do : just glue the 'sound absorber' onto the internal walls ,do not fill all the volume with it ,then increase if needed .

[viki_v2]

thank you for replying,
Box is properly braced, I have not added any thing for Damping.
I tuned port length from Win Isd. I do not mind making any changes to the box, All I want is to produce very lean bass , smooth Mid, And silky Highs but not harsh.

[picowallspeaker]

You should
'Damping' with stuffing helps a lot also for the mids :it attenuates the return wave to the cone .

[viki_v2]

Hello, Friends could you do me a favor, Win isd is giving box volume as 60 liters and port size 6inch length and 3" diameter please check if this is correct, T/s parameters posted above.

[ocih]

i use ht audio bass box pro, 3" diameter 6" length ~ 30hz, i think its to low for your midbass (fs=47,92). 3" diameter 3,5" length ~ 40,xx hz.