Hi guys, nothing here is set in stone. more, long the lines of an open discussion.
my mate and i feel that a horn tuned around the resonant frequency of the cabin of a vehicle will give the highest gain for max SPL in attempt to win sound offs relatively easily.
so my first Q, is ^^ this mind set correct in thinking a horn works like this in a small space?
second, will i be able to maintain a degree of fidelity in order to have war volume, but also have good range of sound coming out of it? as in, his sub is designed to be a one note wonder, and it does it well, but sucks musically. iv always loved my musical sounding subs, and generally make them go pretty well and also sound good. but this time i want to try something new. I have a pair of SS15 Jbell horns. and I LOVE THEM, and want something similar in my Jeep XJ cherokee for when im out in the bush.
here is my layout.
and i have two Pioneer TWS254C subs
Dia 10 in.
Z 4.0 W
Zmax 47.76 W
Re 3.0 W
fs 27.9 Hz
Qms 6.539
Qes 0.467
Qts 0.436
Vas 1.735 ft3/49.13 Liters
Sd 0.373 ft2/0.0346 M2
BL 11.574 TM
Cms 289.1 m /N
Mms 112.27 Grams
Rms 3.019 Ns/m
VC Ht. 1.106 in./28 mm
Air gap 0.349 in./10 mm
Xmax 0.36 in./9.1 mm
le 1.93 mH
VC dia. 1.57 in./40 mm
Displ. 0.044 ft3/1.26 Liters
Sens 87.0 dB
Pwr (rms) 250 Watts
Pwr (max) 500 Watts
any suggestions?
Edit:
ive been bored, so was playing around with hornresp. tell me if im wrong with my numbers, but i was pretty good at geometry in school so like to think i got that part right at least.
here is a horn loosely based on the SS15 (Jbell) folding pattern to suit the space in the back of my jeep.
edit2: forgot to mention, thats 2x drivers there.^^
my mate and i feel that a horn tuned around the resonant frequency of the cabin of a vehicle will give the highest gain for max SPL in attempt to win sound offs relatively easily.
so my first Q, is ^^ this mind set correct in thinking a horn works like this in a small space?
second, will i be able to maintain a degree of fidelity in order to have war volume, but also have good range of sound coming out of it? as in, his sub is designed to be a one note wonder, and it does it well, but sucks musically. iv always loved my musical sounding subs, and generally make them go pretty well and also sound good. but this time i want to try something new. I have a pair of SS15 Jbell horns. and I LOVE THEM, and want something similar in my Jeep XJ cherokee for when im out in the bush.
here is my layout.
and i have two Pioneer TWS254C subs
Dia 10 in.
Z 4.0 W
Zmax 47.76 W
Re 3.0 W
fs 27.9 Hz
Qms 6.539
Qes 0.467
Qts 0.436
Vas 1.735 ft3/49.13 Liters
Sd 0.373 ft2/0.0346 M2
BL 11.574 TM
Cms 289.1 m /N
Mms 112.27 Grams
Rms 3.019 Ns/m
VC Ht. 1.106 in./28 mm
Air gap 0.349 in./10 mm
Xmax 0.36 in./9.1 mm
le 1.93 mH
VC dia. 1.57 in./40 mm
Displ. 0.044 ft3/1.26 Liters
Sens 87.0 dB
Pwr (rms) 250 Watts
Pwr (max) 500 Watts
any suggestions?
Edit:
ive been bored, so was playing around with hornresp. tell me if im wrong with my numbers, but i was pretty good at geometry in school so like to think i got that part right at least.
here is a horn loosely based on the SS15 (Jbell) folding pattern to suit the space in the back of my jeep.
edit2: forgot to mention, thats 2x drivers there.^^
No.
A horn is a quarter wave resonator; in other words, the tuning frequency is dictated by the horn length divided by four.
If you play around with Hornresp, you'll begin to think that u can get big SPL by putting a horn in a car. But this isn't the case. If you want big SPL, use THE ENTIRE CAR as a quarter wave resonator.
Here's why this is superior:
1. Efficiency and box size are connected. When you use THE ENTIRE CAR as the enclosure, you get huge SPL.
2. By using the whole car, you have the luxury of using more drivers than is practical in a horn sub.
The downside to all of this is that you may have to buy a car explicitly because it's quarter wavelength resonance is a good match for an SPL car. Generally, the best cars are small and airtight. (there's a reason that CRXs and pickup trucks post big numbers. If the cab is too big or the cabin leaks, you lose SPL)
Check out my thread on 'bass weapons' for more info, on my forum
A horn is a quarter wave resonator; in other words, the tuning frequency is dictated by the horn length divided by four.
If you play around with Hornresp, you'll begin to think that u can get big SPL by putting a horn in a car. But this isn't the case. If you want big SPL, use THE ENTIRE CAR as a quarter wave resonator.
Here's why this is superior:
1. Efficiency and box size are connected. When you use THE ENTIRE CAR as the enclosure, you get huge SPL.
2. By using the whole car, you have the luxury of using more drivers than is practical in a horn sub.
The downside to all of this is that you may have to buy a car explicitly because it's quarter wavelength resonance is a good match for an SPL car. Generally, the best cars are small and airtight. (there's a reason that CRXs and pickup trucks post big numbers. If the cab is too big or the cabin leaks, you lose SPL)
Check out my thread on 'bass weapons' for more info, on my forum
A front loaded horn has two components. First, there's a sealed box with a woofer in it. Second, there's a horn.
The reason you can get big SPL in a car from a sealed box is that THE ENTIRE CAR acts like a horn. (IE, the car is a quarter wave resonator)
Why bother putting a horn in a car when the car serves the same function?
And believe me, this is coming from someone who put horn subs in cars for YEARS
Just check out some of my projects on DIYMA and this forum. I have a ton of experience with horns in cars, and I'm telling you, they are NOT the way to get SPL in a car.
The exception to that statement is if you're trying to post big numbers above 100hz or so. Above 100hz, car horns have a lot of value. But at subwoofer frequencies? Not so much.
Tapped horns are great, but I don't think they'll ever be the ultimate SPL solution due to their bandwidth. Basically bandwidth and efficiency are correlated. A vented box resonates over a narrower bandwidth than a TH, so the peak can be VERY prominent. But the REAL trick with a vented box is the ability to move it around the cabin so that it excites ONE resonance.
This is the same reason that a singers voice can shatter glass, and the Tacoma Narrows bridge collapsed from wind. QWRs are powerful things.
I openly admit that I did a 180 on this about two years ago. Up until 2010 or so I thought tapped horns could be the ultimate SPL solution for a car.
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