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15" Sub - experimental build - but with a different design

Naveenbnc

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#1
Hi Guys,

Im planning to build a 15" sub in a low budget.
But the interesting point here is its design idea.
Idea credit goes to our @yogibear ....Thanks a lot for so many inputs so far ..!!!
@diyaudio suggested the driver, and gave many inputs as well. Thanks a lot for that too ....:)

As you can see from the picture, the front of the enclosure is just left open, and the driver is mounted on the rear wall of the enclosure.
Literally, the driver is outside the box. It may feel odd in the beginning, but gradually I felt more and more interested to try it out.
It may be called something like "horn loaded dipole bass " as per yogibear :)
Only concern is that it is a fairly large box for my room.

One of the requirements is that the Driver having more than 0.5 Qts would be best suitable for this kind of design.
I searched as much as I can, but high Qts drivers are not found easily, and that too in a budget.:confused:
I saw Ahuja drivers, but didn't have the confidence since their Xmax is low (2 to 3mm)
Later I learned that along with Xmax, other parameters are also significant.

Any way, I ordered a 15" Ahuja driver with Qts 0.54 and Xmax 3.5mm
Today I got the MDF cut, but I have to wait for the driver to arrive.
Eager to build it as soon as possible .... I will keep updating the progress...

Regards,
Naveen



15 SUB AS15 X200 DESIGN_1.JPG
 
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Naveenbnc

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#7
Ok.. image looks nice.. So open baffle sub.. What would be the power requirement for this sub?..
Driver is rated at 200W.

But as yogibear said, it can be driven easily with less power since it has good sensitivity.

The good thing I did last year was.... Instead of buying an active sub, I got a 2 channel amp made by our FM Aniket. Now I have the flexibility to try different passive subs with it. :D:D
 

Dr.Lakshay

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#9
Nice project. Looking forward to the outcome.
The good thing I did last year was.... Instead of buying an active sub, I got a 2 channel amp made by our FM Aniket. Now I have the flexibility to try different passive subs with it. :D:D
How power output does the said amp has?
 

elangoas

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#10
Driver is rated at 200W.

But as yogibear said, it can be driven easily with less power since it has good sensitivity.

The good thing I did last year was.... Instead of buying an active sub, I got a 2 channel amp made by our FM Aniket. Now I have the flexibility to try different passive subs with it. :D:D
Ok Great.. So dual subs then?..
 
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Naveenbnc

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#11
Ok Great.. So dual subs then?..
ya .... i have to find out if this sub is suitable for movies or music or both ...
may be the sound will be different from my existing iwai 12" sub. Any thing is fine for me. Il just try at least for the fun in building ....

But the box is huge for my room. Just for reference, i checked how it looks like if I add a full range on top.
The below pic shows their relative size with respect to 9feet wide screen :D:D
 

elangoas

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#13
ya .... i have to find out if this sub is suitable for movies or music or both ...
may be the sound will be different from my existing iwai 12" sub. Any thing is fine for me. Il just try at least for the fun in building ....

But the box is huge for my room. Just for reference, i checked how it looks like if I add a full range on top.
The below pic shows their relative size with respect to 9feet wide screen :D:D
Great.. What are the dimensions of the enclosure?..
 

Naveenbnc

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#14
Size is prescribed by yogibear.
2ft wide, 30" height, 16" deep.
Pretty Big. :D:D

I have to say that IL cover it in foam and rexin. So that my kid can sit on it and play.
Otherwise, such a big box won't find easy entry into that room ;):p:p
 

elangoas

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#15
Size is prescribed by yogibear.
2ft wide, 30" height, 16" deep.
Pretty Big. :D:D

I have to say that IL cover it in foam and rexin. So that my kid can sit on it and play.
Otherwise, such a big box won't find easy entry into that room ;):p:p
Size is huge.. Looking forward to your build and pick some info from here..
 

Naveenbnc

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#16
So is this some sort of OB? And will the Qts work?
It is more close to horn loaded dipole, than ob. As far as the Qts is concerned, I searched for higher qts drivers in a said budget. Some are not available in stock. So this driver is the most promising within the "available options":)
 

yogibear

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#18
Now I am getting nervous.....

Looking forward to your listening impressions. Do you have active crossover ? Experiment, around 150 Hz to 100 Hz with a full range at the top. However if it sounds good, the full range will have to be mounted with no physical contact with the bass box. Notice how the WE horn is mounted, in the earlier picture.

Lionx attempted this design with his 15" Bolton bass driver and he was impressed.

Here the picture:

IMG_5834.jpg

Here is mine, when it thundered all the 8 floors of the apartment building, playing at 3rd floor:

IMG_5788.jpg
 

Naveenbnc

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#19
Now I am getting nervous.....

Looking forward to your listening impressions. Do you have active crossover ? Experiment, around 150 Hz to 100 Hz with a full range at the top. However if it sounds good, the full range will have to be mounted with no physical contact with the bass box. Notice how the WE horn is mounted, in the earlier picture.

Lionx attempted this design with his 15" Bolton bass driver and he was impressed.

Here the picture:

View attachment 30847

Here is mine, when it thundered all the 8 floors of the apartment building, playing at 3rd floor:

View attachment 30848
im also pretty excited :D:D
But due to some reason, in a worst case, if it doesn't sound that good.... there will be absolutely no disappointment.
Speakers is a recent hobbie for me, but DIY is something im doing since childhood, and i take failures very very easy .... :p:p

But im curious to know, is there any better suited driver for this design (somewhat higher Qts and low Fs) ??
May be I can afford around 6 to 10k max.
 
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