Thread: Prototyping three ways

2 Kevlar foam core neo motor midrange I made.
1 dual VC epoxy filled 15in speaker with Fe motor. About the same as new B&C 15in output minus the below 40Hz.
CDX3050 on custom horn.

Should be good crossed from 40-80 up with a subbass system to make full range but the sensitivity is at least 100db right now (maybe more). The Kevlar 8's are 5g cone weight. I made 10in which passed breaking in of 4hrs which was 8g. Sphericals show they both work to around 1300+Hz which is good.

Makes a pretty good 3-way minus the sub-bass. I should note the boxes are just random. The mid-high box is ported for 60 Hz with some High-BL 8in speakers but the mids aren't operating in that range.

PS. Images show 10in in a moded box to be sealed. A 70 thou gap 1.1T magnet and a 67 thou gap fenalic 1.6T magnet which delivers ~34Txm to the speaker.

I put together a little bit better 4-way system and fixed some of the tuning problems.
Bottom of sub-box is LF dual VC Fe 15in speaker running from 20-60Hz.
Top of sub-box is dual VC Neo motor low-mid running from 80-250.

Built your own woofers... That is cool as hell! How'd you do that, and how are the results?

Originally Posted by Bennett Prescott

How'd you do that, and how are the results?

To be honest, I do work for a loudspeaker manufacturer so I did have access to baskets, cones, fixtures, and etc. These were just some garage projects that I really wanted to see how well they would work. I wanted to make 8in and 10in composite cones and I wanted to make some dual Voice-coil magnets in a number of Flux Density. As soon as I get a nice day I'll go outside and take some measurements. They were really easy to cross over and only a few PEQs. Making the composite cones really was 'Make Your own Woofer' and was a lot of fun.

That is most impressive and the 4 way boxes / setup looks like a neat little kit. What are you using in the cabinets? It looks like some sort of upholstery filler.

Originally Posted by Ben Lawrence

That is most impressive and the 4 way boxes / setup looks like a neat little kit. What are you using in the cabinets? It looks like some sort of upholstery filler.

Its a denim from some company I saw in a post on soundforums.net. Actually I can't remember the name and I lost the box. Its pretty expensive stuff, so much so that we don't use it at work. But it does have absorption on par with Cer-Wool without the health drawbacks! ;-) The normal denim we use at work is still pretty great, leaps and bounds better than Dacron.

A few weeks back I did sneak in some measurements while I was doing other stuff. They aren't that earth shattering but do show that a very light weight speaker can be stiffer than it's paper alternative. Left paper / right Kevlar.