8" subwoofer horn |
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bob4
Old Croc Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1842 |
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oh, I see...... do you care to elaborate how and why you arrived at this design specification? It seems a very odd thing to do.
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4AC
Young Croc Joined: 18 September 2010 Location: Netherlands Status: Offline Points: 521 |
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Talking about one note bass
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uǝɿɿɐʌǝ6ɯo sı ʇsʞǝʇ ǝzǝp
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Peter Jan
Young Croc Joined: 16 December 2008 Location: Belgium Status: Offline Points: 1019 |
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With these T/S parameters and the given that you want only solid respons between about 50 to 60 Hz, I would make a 6th order bandpass cab and tune one port around 47-48 Hz and the other port about 63-64 Hz.
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1647 |
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I had a hunch when I saw the pic, so a bit of Google-fu shows these are from a brand that specialises in models for car audio competitions - they use specific tone bursts rather than real music, hence only wanting to cover a small frequency range. It also means cabin gain from the vehicle will affect the response and make normal models inaccurate as far as SPL goes. Lastly, a few of the specs seem bogus - they claim it's a 4Ω nominal driver, but Re is 7.2Ω. I've already checked and the maker does not state this is a dual voice coil driver, so we can't even assume the 7.2Ω is for each VC with the 4Ω referring to 2 in parallel. OP also states it's a 1500W driver but the specs posted show Pmax of 1000W, so frankly, I wouldn't trust the specs anyway. Apologies to OP if this comes across a bit negative, best advice I can come up with is find a forum that specialises in car audio rather than this one perhaps? Good Luck, David.
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bass*en*mass
Old Croc Joined: 03 September 2009 Location: "unknown" Status: Offline Points: 4009 |
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i`d second the 6th order bandpass cab option for the required narrow passband..
1/4wave resonator/transmissionline might be an option too. full frontloaded horn will be too big and wasted imo, bandpasshorn with large front chamber might work though. tbh., that car hifi driver is not ideal to start with.. |
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akadj
Registered User Joined: 25 June 2015 Location: Edmonton Status: Offline Points: 16 |
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So i guess to start with yes, the driver is a dual 4 ohm coil so RE is 7.2 ohms. The woofer has a 2-1/2" flat wound copper coil with dual progressive spiders, trust me they take 1500 watts .
The manufacture is one of the oldest manufactures in the USA for audio speakers "SJA INDUSTRIES" so they are very reliable. perhaps they re rated the woofer. I did think about a 6th order series bandpass but thought a horn would be smaller? maybe i'm mistaken... I've been watching some of the videos since i cant run the program, trying to learn about tuning a horn.
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akadj
Registered User Joined: 25 June 2015 Location: Edmonton Status: Offline Points: 16 |
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ok so i finally got the program installed and have been trying it out. ive never made a horn enclosure before so i'm not sure how big to typical start with, nor do i know where to start tuning. I've built many of regular bass reflux ported boxes.
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