Ditching SPL...

Yeah I agree most hifi subs under £1000 which are ready made,sound like utter s**te, nothing but 1 note booooooom and rumble.

From experience I used to have active subs like Paradigm,JPW,JBL, and they all sounded total crap.Just rumble they did and boomed like a cheapy car sub.lol

I used to have 4 HD15's and they were great for kick bass[mid bass] but lacked sub bass from below 70hz.I did try 1 a side on my rig and the bass was pretty weak.So I ended up selling them.But Dom says they only sound decent with proper power though them and in a stack of min 8.

So you better off using 1 X1 bandpass sub.

Or you could use a smaller sub like this  http://www.fane-acoustics.com/public_html/media/pdf_media/Ca binets15inch125L.pdf

uses a 15 inch Fane driver and is a compact reflex design.

Fane says for that hifi/permentant installation use of that bass bin you can use 18mm MDF.

 

 

Edited by ToXiC

Your problem is not bass, it's that your BLH will not keep up to what you're looking for, as the transients go up much higher than you think.

Once you have grown used to what a nice (and I mean nice) clean small PA top does, you'll never look back from a 4" FR (which is nice for background music though).

If you wanted something really nice for that, have a look at Staipers BPH or something similar, as you'll want to cross as high as possible (200Hz is the minimum)

If you want the "fast", sound, roll off bass at 50Hz 3-6dB per octave indoors or have it measured flat (which is rather rare and generally implies tricked large room or outdoors.

I think it will work. As you don't need PA SPL but you can throw some power to the speaker (to compensate the lowish output at 40Hz) you can get a response to 40Hz or even lower. To get it flat you will have to do more than that. I think you'll need a digital LMS (a cheap one does it, like the Behringer UltraDrive) because you WILL have to equalize your room AND the HD15. The HD15 will play to around 65Hz in single outdoors, which means you can't get flat response by simly putting a 12dB filter. In addition, INDOORS in such small rooms, the loading of the HD15 is better, so it will play lower, but how low and how the plot looks is unpredictable then. So you need something to measure your room with the HD15 (once only) and something to tune the output of the HD15 (like the Behringer unit).

 

For 40 to 80Hz use, one HD15 would be enough....

Edited by JD01

karlson provide high-impact - if drivers are strong - but norrmal tuning puts f6 outdoors around 55Hz in my yard (which has a hillside dropoof only a couple of meters from my measuring position)

a stock 2-way K15 w. farily high xover (1K6 - 3K) will play awesome techno and rap kickdrum assuming low mass/low Le driver

"eXemplar" re-tuned K15 with 2-3"ID rt.angle pvc vents an an adaptor board to fit over the regular vent, loaded cabinet with 515 (416 did ok for me) and applied bandpass boost centered around 30 to augment VOT



not sure how either tuning would mate with a little BLH as have never owned one other than homemade mess bult 40yr ago- but low tuning w. kluged boost from EV interface box was very nice with theatre organ cds with a small karlson w. 12" and 80Hz electronic xover  -  was run in mono with cheap 20w/channel  JC Penny receiver.

stock tuned karlson are clean but deficient in lowest pipe organ tones  - old iron law of bulk vs efficiency

heres a k15 size outdoors sans shelf refinement loaded with older Eminence 18  at 110W nominal input/50Hz - overtones are about 2%

dip would not look as severe if ~5" board is inserted above baffle and/or if cabinet tilted forwards

I don't know the significance of low distortion on sine vs music tracks - some pa horn measure 10X worse than this 1 sheet box

some little karlson with slit vents do poor on sine but 'ok' on music


outdoors plot




Edited by freddyi