Ok… I have finally begun plugging away at a new project. My last few speaker building projects (and my measurement projects for that matter) have been failures. This project will not! And, on top of that I am actually going to finish this one (I hope).
The Drivers:
After looking at a lot of different drivers I decided that I should choose a well behaved woofer. After all, my last project never got anywhere because I just never figured out how to tame the drivers complex breakup. So this time I want paper or poly. But which one? I decided to try both. So I have a Peerless 830875 6.5″ Nomex woofer and a Peerless 830874 6.5″ Poly woofer. These will be mated to the Usher 9930 tweeter. I think these will go well together. But we will see.
The Box:
After doing some modeling in Soundeasy I decided to build a relatively exact replica of the parts express .5′ box. I am now wondering if this is a little small for this woofer and since I built the damn thing myself I am wondering why I didn’t just make it a little bigger. One thing I have noticed already… .5 cubic feet is pretty big. I was thinking this would a relatively small speaker. Not the case.
Here is the basic tuning info with a 2
This is the modeled impedence vs. the measured impedence. Modeled on top, measured beneith.
There are already a few things that I think I am going to change before going on to the next step. The baffle is currently removable. I don’t like it. It doesn’t seem as rigid as a completed box and the supports that I am bolting it too keep breaking, even though they are made of oak. I think I will also move the woofer closer to the tweeter. It didn’t look that far away when I drew the baffle on the computer, but I don’t see any reason why it couldn’t be 1″ closser.
Here is a different box and tuning I am thinking of:
And an overlay of the old with the new:
Hello. I purchased both the Nomex and Poly versions of Peerless HDS woofers, but, mine are the 5.25″ size.
I also bought the 6.5″ Peerless Nomex HDS 6.5″ woofers however. I attempted to buy 16 when Parts Express had them on Buyout special – but – they only had five left when I ordered…
I hope to be building a variety of designs with these assorted woofers over the summer. The Nomex versions of your woofers have been used in at least a couple well regarded commercial designs, and, will be used in future commercial designs also.
I’m looking forward to your listening impresssions.
The first tweeter I will be trying is this one:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=279-450
Unfortunately, I’m banned from HTGuide due to one member and one of the admins treating me very rudely. I went by “Critofur” and “Sakura” – the second name they banned simply because they found out it was me again, not for any other reason. They went so far as to edit posts they simply disagreed with, not even rude or violating any forum rules!
Anyway, best of luck with your speakers, and, if you care to post your measurement files, some of us would probably be happy at helping with your crossover.