Can i made this woofer good(going down and loud) for ht? I have never make diy woofers so can some one help and give some advice?I want loud good woofer. http://www.bigdogaudio.de/pd561831531.htm
I think vented would match room gain better.
It needs a huge enclosure.
With 400 liters tuned to 19 Hz it looks right, 112,5 dB at 20 Hz without room gain. Maximum SPL is 120 dB without room gain at 100 Hz. You need 290W RMS.
You can put this enclosure smaller, you get a bit more maximum SPL but lose SPL at 20 Hz.
You could get even more SPL at 20 Hz if you build a larger enclosure and abuse with tuning frequency.
It needs a huge enclosure.
With 400 liters tuned to 19 Hz it looks right, 112,5 dB at 20 Hz without room gain. Maximum SPL is 120 dB without room gain at 100 Hz. You need 290W RMS.
You can put this enclosure smaller, you get a bit more maximum SPL but lose SPL at 20 Hz.
You could get even more SPL at 20 Hz if you build a larger enclosure and abuse with tuning frequency.
Unless you already have such a unit, I would not recommend the use of car woofers (even most high end ones) for home use, for the following reasons:
They are usually more expensive due to cosmetics
They are usually less efficient, although the one you linked to is an exception
Fs is often too high (designed for car cabin gain which kicks in much earlier than room gain)
Those that I have tested had much higher 3rd harmonic distortion than home units. I think this is sometimes done deliberately to give a punchier sound with peaky tuning in high SPL situations.
Upper bass response is often poor compared to home sub drivers.
They are usually more expensive due to cosmetics
They are usually less efficient, although the one you linked to is an exception
Fs is often too high (designed for car cabin gain which kicks in much earlier than room gain)
Those that I have tested had much higher 3rd harmonic distortion than home units. I think this is sometimes done deliberately to give a punchier sound with peaky tuning in high SPL situations.
Upper bass response is often poor compared to home sub drivers.
Well its quite hard to beat diy woofer this: SVS PB12-Ultra/2 measurements with RadioShack spl meter(analog).
Subwoofer is placed in corner and measure was 3meters distance.
SVS has PEQ, i use it to get straight response as i can.
I use 25Hz tune to get maxim pressures and subsonic filter is 25Hz.
Hz dB Max dB
200 60 97
190 60
180 60
170 58
160 63
150 69 113
140 72
130 63
120 75
110 75
100 79 114
95 70
90 59
85 57
80 65
75 70
70 75
65 78
60 76
55 70
50 76 107
45 85 117
40 86 119
35 86 116
30 88 113
25 87 110
20 79 102
Subwoofer is placed in corner and measure was 3meters distance.
SVS has PEQ, i use it to get straight response as i can.
I use 25Hz tune to get maxim pressures and subsonic filter is 25Hz.
Hz dB Max dB
200 60 97
190 60
180 60
170 58
160 63
150 69 113
140 72
130 63
120 75
110 75
100 79 114
95 70
90 59
85 57
80 65
75 70
70 75
65 78
60 76
55 70
50 76 107
45 85 117
40 86 119
35 86 116
30 88 113
25 87 110
20 79 102
Do you have a budget limit? You seem to want something very high end.
You could consider the Ascendant Audio Avalanche 18" or the Adire Audio Tumult 15". You could even go overboard and ask Adire Audio for a Parthenon design.
The driver you listed, the Hertz, could do around 122,5 dB at 20 Hz in room if you design it to be flat in room response.
Tempest would be around 121,5 dB at 20 Hz in room if you design it to be flat in room response.
Maelstrom would be around 123 dB at 20 Hz in room if you design it to be flat in room response. It's harder to have a flat in room response with the Maelstrom, it rolls off faster. You would have an amazing 128 dB peak SPL at around 100 Hz if it's max SPL that you want.
You could consider the Ascendant Audio Avalanche 18" or the Adire Audio Tumult 15". You could even go overboard and ask Adire Audio for a Parthenon design.
The driver you listed, the Hertz, could do around 122,5 dB at 20 Hz in room if you design it to be flat in room response.
Tempest would be around 121,5 dB at 20 Hz in room if you design it to be flat in room response.
Maelstrom would be around 123 dB at 20 Hz in room if you design it to be flat in room response. It's harder to have a flat in room response with the Maelstrom, it rolls off faster. You would have an amazing 128 dB peak SPL at around 100 Hz if it's max SPL that you want.
You should really consider this one...
http://www.ascendantaudio.com/Avalanche 18.htm
Ok with a Maelstrom and two Passive radiators...
It will be hard to have a flat response in room down to 20 Hz because the response rolloff is fast down low. To get a good response the enclosure would be 300 liters if I use dual PR15 with 200 grams added in each so final tuning is 19 Hz. I would go vented with a box this big, it would need only a 6 inches long 4" diameter port. You could even put two 4" diameter ports of 15 inches long.
To reach 123 dB at 20 Hz and 128 dB at 100 Hz, you'll need 450W RMS. You can't use more because you're at full excursion.
http://www.ascendantaudio.com/Avalanche 18.htm
Ok with a Maelstrom and two Passive radiators...
It will be hard to have a flat response in room down to 20 Hz because the response rolloff is fast down low. To get a good response the enclosure would be 300 liters if I use dual PR15 with 200 grams added in each so final tuning is 19 Hz. I would go vented with a box this big, it would need only a 6 inches long 4" diameter port. You could even put two 4" diameter ports of 15 inches long.
To reach 123 dB at 20 Hz and 128 dB at 100 Hz, you'll need 450W RMS. You can't use more because you're at full excursion.
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