Of course as time went on and more and more money got spent, I realised that for the amount I'd spent I could've just bought something, but as I get a lot more performance than even a pair of high end subs out of my DIY versions, then as far as I'm concerned I made the right choice. It's strong cardboard tubing that is used to cast concrete. I've included as many details as I could about the process, so if you are planning on making your own cylinder subwoofers, then hopefully you'll find some useful information! There is to my ears anyway an improvement in sound quality now so I'm leaving them like that. Here you will find speaker building tips that can help your project go more smoothly. Rain Defence (author) from UK on September 24, 2013: To be honest if I could've got it I probably would've used it but its not as easy to get in UK and I got the metal ducting for free. I wanted an SVS PC13 Ultra subwoofer as I had read good things about them, but I didn't really have the spare cash as they're not cheap. This is simply screwed on. As the majority of cylinder subwoofers are made in America of cardboard tube with the sonotube brand name, a subwoofer made in this way is commonly known as a sonosub. In the room I use them in, I didn't need the full output that they give, so it wasn't an issue, but if I was using them in a much larger room and needed them to be running at near their max capability, I may well have kept them ported. subwoofers) to suit your stereo or home theatre system. This is easily done with a metal grinding blade in a 4 inch grinder. These drivers are 18 inch diameter, which is the same size as the cylinders that I had so initially I thought it wasn't going to be possible, but then I realised that only the basket has to fit inside the cylinder and that part is approx 16 inches, so it was going to be possible. Power Acoustik. I would highly recommend building something like these if you are interested, it wasn't too tough and is a big upgrade from any commercial subwoofer I've ever heard. DIY 6DJ8 (ECC88) Tube Headphone Amplifier - 24 November 2012 This low power tube headphone amplifier project comes from Bruce Heran. The sound quality of this subwoofer was excellent. After the driver was in, then I attached the floor plate. The quality of sound from these subwoofers is absolutely fantastic, they have a lot of power so can shake the doors in the house if I want them to, but they are also capable of subtle and detailed bass. This is the view I had after it was done. A great choice where space is limited, though performance may vary based on positioning of bass tube. It worked, but if you're not on a budget, then you might want to get some different foam, or maybe cork. Thanks for sharing. The cylinder was made from aluminium ducting pipe, lined inside and out with foam, with mdf endcaps. Several types of subwoofers systems are covered As soon as I heard it, then I realised I wouldn't be going back to my Monolith and sold it straightaway. This is what the driver looked like once it had been screwed into the endcap. DIY Speakers. Amplification of DIY Subwoofers: The most cost effective method of amplifying your do-it-yourself subwoofer is a professional PA amplifier. Whichever is used it would need to be damped though. Once I'd dropped the cylinder onto its side again, this is the view I had looking down towards the driver. The narrow ring fits inside the cylinder and the wider one is for the outside, which is why only one of them is painted. The subwoofers are hooked up to a Behringer EP4000 power amplifier. … There was no doubt in either of our minds that mine sounded considerably better than his. 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