Q&A for How to Build a Speaker Box

This method would work -- you just need to adjust the measurements to fit a 15" driver. It's probably easier to look up a guide designed specifically for a sub though.There are loads of them on car audio sites.

It's Polyester fluff for filling stuffed animals, comforters, and I assume for stapling to the inside of this box. Ask someone at a craft store or in the craft section of Walmart.

Just follow the steps in the article.

If you are talking about hooking up a pair of 15 watt speakers to a 150 watt amplifier, the answer is no. It will result in catastrophic failure.

Yes, they have special design and construction. You won't be able to replicate it on your own.

No. If you connect two speakers in parallel, you will have an equivalent of one 1000 w speaker at 4 ohms. If you connect them in series, you will have an equivalent of one 1000 w speaker at 16 ohms. In doing that, you will either reduce or damage the amp performance.

You can find poly fill at Walmart, Michael's, or any fabric store, like JoAnns.

Yes, but it's often easier to put a portable speaker in a bucket or box to give it some oomph. A box like this is really only for a 'normal' speaker. If you are planning on disassembling the Bluetooth speaker and mount the actual driver, then yes, this should work.

You can, but there will be more port noise.

It makes the subwoofer act like it is in a bigger box. It gives you deeper bass and a tighter bass response in a sealed package.

You need the Thiele Small specs for your driver(s), which should be available on the manufacturer's website, and access to enclosure design softwarr. You may be able to find free software on some websites. A distant second choice would be to use the dimensions of a production cabinet that has the same drivers.

If you are using two woofers, yes, generally you can put them both in the same airspace, but they should both be roughly the same size and compliance, otherwise the back wave from the larger speaker could overdrive the smaller one. If you use a midrange speaker you should separate the airspace from the woofer. Often this is done by using a cup behind the midrange, sealed to prevent interference from the woofer. Most tweeters are sealed on the back, so those can be placed directly on the baffle with the main woofer.

There are much better ways to get a sub woofer sound. There are some smaller speakers designed to produce good bass sound. Using 4 15" speakers in a car seems excessive and could be hazardous to your hearing. (I am speaking from experience, 66 yr old rocker.)

Most wood would be fine for this project. Something strong would make it last a long time. Soft woods, such as cedar or pine are easy to work with and are very strong.

The article here says yes, but different woods will make different tones. Think about how Stradivarius made violins like everyone he was competing with, yet his varnish changed the sound making the instrument the most sought after today.

You can use the linkwitz transform circuit and the linkwitz transform spread sheet calculator to design the filter for an 18 inch subwoofer in a very small box.

You need a solar panel, a pack of rechargeable batteries and a battery charger circuit meant for solar panel. Secondly, you need to add a buck converter to achieve the desired voltage to drive your class D amplifier, which will power the speakers. You can mount the solar panel on top of the speaker box.

You need a 3 way passive crossover to connect the horn tweeters and the woofer. You'd need to determine your crossover frequency based on individual driver specs and, if possible, take measurements in a box before designing or procuring crossovers.

MDF or HDF are the best options. Or else, you can go for compressed woods or Baltic birch plywoods.

Equal dimensions will cause standing waves, follow the golden rule in box design. Make box volume only after knowing the TS parameters and calculating the volume through a software program like winisd and simulate the frequency response before finalizing on a box volume. Box volume made without the manufacturer guidelines or without the software will produce meagre results.

Yes you ca. You need to use subwoofer meant for producing low frequency and you also need a suitable active crossover to achieve the desired results. Try crossing subwoofer below 100 to 120hz.

A ported box will produce deeper bass notes and are better for subwoofers. They're also generally louder than a sealed speaker box. However, sealed speaker boxes will produce better and clearer sounding high notes.

Use your speaker to help determine how big the box should be. You can figure the depth of the speaker box by adding 2 inches (5 cm) to the depth of the speaker. Then, use the speaker’s height and length measurements as the box’s internal height and length dimensions. Multiply the depth, height, and length to determine the internal volume of the box so it produces quality sound.

Medium-density fiberboard, or MDF, is commonly used to make a speaker box. However, baltic birch plywood produces a better sound clarity and tone, but it's more expensive. You can also use standard plywood to make a speaker box.