Alright, so here'* the deal. I want to build a nice sound system in a very small package. Not looking to spend a fortune. I want to build a set of very compact bookshelf speakers with a great frequency response. This will be a gift for my father in law who'* birthday is coming up in a month, who also just finished a difficult and stressful treatment for lung cancer. He'* on his way to recovering now.
For those who don't know, the basement bedroom (which is easily over 500 sq ft) used to be his office, but with the lung cancer, he moved his office to his bedroom. He gave my wife and I the basement bedroom to renovate and live in as they asked us to stay with them for a while to help him with anything he might need since he'* an IT consultant and I'm an IT engineer. Down here he used to have a badass sound system using my two Polk RM40T'* (google them) and a 12" sub. He used to blast it all the time and play his classic rock for the whole house to hear. Well, he can't do that anymore, and I feel bad since warmer weather is coming and we'll probably be here a while longer.
So, given he doesn't have much space up in his bedroom office, I wanted to make him a set of speakers that will blow him away but be small enough to fit on his desk.
Here'* the plan.
The heart of this system, two 4" midbass drivers that would be better classified as full range. Capable of reproducing 60hz-10k hz.
This is a larger version of the Aura NS3 3" driver that packs an insane punch for a 3" speaker. People have built boxes and tuned them down to 40hz successfully. Very large excursion for a 4" driver, and good power handling. Best of all, cheap. I will be using 2
of these per cabinet.
Fast forward to 1:42 to see what these can do: http://www.youtube.com/watch?v=LUNsxdyPnyM
Since the midbass drivers aren't exactly full range all the way to 20khz, I opted for a "helper" tweeter to complement them.
Don't let the price fool you, these sound quite amazing.
For making my own high pass crossovers for the tweeters. I will add the larger one first, then test while adding one of the smaller ones one at a time in parallel until the tweeter sounds too hot, then back off one. Simple.
Hope the thickness won't matter. I was supposed to get 1/2" but accidentally got 1-1/2".
Port will be built using 1" ID PCV at 113mm length.
Boxes will be 6 liters of volume each, which comes out to .21 cubic feet. I'm going to try for thinner, taller cabinets. Undecided on what material to build these out of. I still have a lot of 3/4" MDF remaining from a previous project, but that'* likely going to be too thick.