Jonnyswboy Posted July 19, 2020 Report Posted July 19, 2020 For a Fi SSD 15 on 1500RMS going for SPL. Mostly wondering about the port area/length.
Jonnyswboy Posted July 20, 2020 Author Report Posted July 20, 2020 WinISD: https://drive.google.com/file/d/1w3BT704YI-xcH1vC_-RD0L1d5bQTamd7/view?usp=sharing
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 Tune it lower to give it a better bandwidth, so 32-33hz, and add make the enclosure 4.6 cubic feet net volume so after subwoofer displacement it’s at 4.4 cubic feet and the port area is fine, if you increase the net volume. This would be a 10% increase of recommended net volume and 17sq” per cubic foot when it comes to the port area. That would slam. For spl you have to increase the net volume a little past manufacturing recommendations, 10-20%. Port area too. Port area is found out after the increase by factoring in net volume sizing and rms of the amp. What kind of vehicle is it going in? “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
Jonnyswboy Posted July 20, 2020 Author Report Posted July 20, 2020 9 minutes ago, 1point21gigawatts said: Tune it lower to give it a better bandwidth, so 32-33hz, and add make the enclosure 4.6 cubic feet net volume so after subwoofer displacement it’s at 4.4 cubic feet and the port area is fine, if you increase the net volume. This would be a 10% increase of recommended net volume and 17sq” per cubic foot when it comes to the port area. That would slam. For spl you have to increase the net volume a little past manufacturing recommendations, 10-20%. Port area too. Port area is found out after the increase by factoring in net volume sizing and rms of the amp. What kind of vehicle is it going in? Most of my music is in the 34-40hz range, so wouldn't 35hz tuning make it much louder in that range? This is the largest I can make the box and still fit it in my 2010 Mazda 6. I could maybe go an inch wider and deeper max. The most I could increase port area to is 83sqin which would take peak velocity down from 26m/s to 23m/s. Amp is Taramps MD3000.1. Would I be able to make it louder if I reduce net volume to 3.8-4.0?
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 Port area is fine. Make the port wider. That velocity isn’t a comfortable velocity. A little too high. People say you can go to 30 meters per second but that’s risky. Anything past 25 meters per second is risky. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 What’s the biggest you can make the enclosure? And hold up, that port is 6.25” wide. There’s no way the velocity is that high on that little bit or rms at 35hz. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 WinISD has been wrong before. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 THE VELOCITY IS WAY TOO LOW AND AFFECTS THE OUTPUT IN A NEGATIVE WAY. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
Jonnyswboy Posted July 20, 2020 Author Report Posted July 20, 2020 3 minutes ago, 1point21gigawatts said: WinISD has been wrong before. When I used one calculator I get 68in2 and when I used a different one I got 80in2, so I just chose between them. I'm putting 1500rms to it also. The calculators: https://docs.google.com/spreadsheets/d/122Qmj0knD3KQ3GmfxpVIynXirCOFvmfe0otVpywC_nM/edit#gid=1632976665 http://www.carstereo.com/help/Articles.cfm?id=31
1point21gigawatts Posted July 20, 2020 Report Posted July 20, 2020 “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.”
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