Fastxb13r Posted March 23, 2022 Report Share Posted March 23, 2022 Hi I’m making a box for 2 15” Skar Audio VXF-15 I had one and had it in a box with the exact hertz and just doubled the size for 2 in order to try to reproduce the similar sound. Issue is I feel the port isn’t accurate when using subbox pro and am wondering if someone can assist? I’m by no means a pro but I’m good at building the boxes and bracing and such just the port is always tricky and I want to avoid port turbulence. Can some of you seasoned pros take a look and assist or give me input on this? https://subbox.pro/en/b/iFbrmgWzf Link to comment Share on other sites More sharing options...
Fastxb13r Posted March 23, 2022 Author Report Share Posted March 23, 2022 I will have two amps on these subs each amp pushing 1500 watts. The RMS of these subs says 1500 and although I’ve pushed more power to one I prefer to not overpower them and blow them. Link to comment Share on other sites More sharing options...
Joe X Posted March 23, 2022 Report Share Posted March 23, 2022 A wall? what vehicle are you working with? Link to comment Share on other sites More sharing options...
CMcLane816 Posted March 24, 2022 Report Share Posted March 24, 2022 Okay, I got you. So I have 2x vxf 15s myself. Your main problem here is that you didn’t increase the port size for the 2 subs, you will want anywhere from 14-16 sq inches port area per net internal volume. Also, you internal volume is a little high for those subs, well I would say really high. Depending on what power you are putting on them, a good net internal box size for these subs is 6.6-6.9. You are sitting at 9 net cubes which is huge. I will give you my box specs, I’m 6.4 net cubes, tuned high at 35hz with 132 square inches of port area. Link to comment Share on other sites More sharing options...
CMcLane816 Posted March 24, 2022 Report Share Posted March 24, 2022 However is my situation, I’m overpowering the subs so I have them in slightly smaller box, with bigger port area. Im about 21 inches port area per net cub (6.4x21) to give me 132 square inches port area. I have a friend I met online with same 2x vxf 15s, he has 6.8 net cubes, 112 port area, tuned 32hz and his sounds fantastic also. Im tuned at 35hz and can play 27-63hz with ease at max power. He can play 22-63hz with ease and slightly different bass sound but they both sound great. You will need at least 105 + square inches of port I would say for those subs on 3k rms + . I have mine on tar amps smart 5 and so does friends, absolutely slaps. Link to comment Share on other sites More sharing options...
Fastxb13r Posted April 25, 2022 Author Report Share Posted April 25, 2022 On 3/23/2022 at 4:46 PM, Joe X said: A wall? what vehicle are you working with? Can’t do a wall needs to be a daily still. It’s a 2020 Nissan Murano Link to comment Share on other sites More sharing options...
Fastxb13r Posted April 25, 2022 Author Report Share Posted April 25, 2022 On 3/24/2022 at 1:40 PM, CMcLane816 said: However is my situation, I’m overpowering the subs so I have them in slightly smaller box, with bigger port area. Im about 21 inches port area per net cub (6.4x21) to give me 132 square inches port area. I have a friend I met online with same 2x vxf 15s, he has 6.8 net cubes, 112 port area, tuned 32hz and his sounds fantastic also. Im tuned at 35hz and can play 27-63hz with ease at max power. He can play 22-63hz with ease and slightly different bass sound but they both sound great. You will need at least 105 + square inches of port I would say for those subs on 3k rms + . I have mine on tar amps smart 5 and so does friends, absolutely slaps. Contacted you directly about this appreciate your replies and sorry was out of the country for a bit and just got back in the states. Link to comment Share on other sites More sharing options...
Fastxb13r Posted April 26, 2022 Author Report Share Posted April 26, 2022 On 3/24/2022 at 1:32 PM, CMcLane816 said: Okay, I got you. So I have 2x vxf 15s myself. Your main problem here is that you didn’t increase the port size for the 2 subs, you will want anywhere from 14-16 sq inches port area per net internal volume. Also, you internal volume is a little high for those subs, well I would say really high. Depending on what power you are putting on them, a good net internal box size for these subs is 6.6-6.9. You are sitting at 9 net cubes which is huge. I will give you my box specs, I’m 6.4 net cubes, tuned high at 35hz with 132 square inches of port area. Could I get your box specs if you don’t mind? Link to comment Share on other sites More sharing options...
Joe X Posted April 26, 2022 Report Share Posted April 26, 2022 Specs are no mystery, these are right from skar and are per driver: Recommended Sealed Volume: 2.75 ft³ Recommended Ported Volume: 3.25 ft³ Recommended Port Area: 47.25 in² Recommended Tuning Frequency: 32 Hz So for two subs ported, 6.5 net, 95 square inches of port area, tuning 30-35Hz depending on you taste, in a SUV/hatchback subs up/port back. Link to comment Share on other sites More sharing options...
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