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Get familiar with the reaction system: Introducing the Reaction System
Whatcha planning of Buying if PE has 20% this weekend for MWAF?
I have always wanted to try a Bessel array with tweeters, so I plan on picking up a bunch of ND20FB-4's...
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I love these tweeters. I have used them in several projects and they are just great. I usually cross them over around 4khz. 3.5khz is very doable.
You really can't beat them for the price if you need a tweeter in that range and don't plan on high SPL.
I think they can still do 95 dB at 12 ft away.
I'm thinking of picking up an 8 pack of the 2x7 Res Core drivers. Maybe try my hand at building a super thin WWTWW tower with my pair of Bozhen CQ76B tweeters, crossed at about 1.5kHz. Don't know of anyone that has used this driver yet, but the spec sheets claim a very wide horizontal polar response out to 4kHz. This would eliminate the typical tweeter/midwoofer directivity mismatch problem. I could also experiment with trying to match them up with my B&G RD40's.
https://www.parts-express.com/Dayton-Audio-RC180-55-2-x-7-Res-Core-Neodymium-Woofer-4-Ohm-295-248?quantity=1
Those have piqued my interest for quite some time but no one seems to have used them in a build. I'll be watching closely so hurry up and get started.
Taking advantage of the 20% off and buying the other five ICEpower 700 modules I need for my amplifier projects.
The problem is that they are not very sensitive (79dB/2.83/1M), so you would need to use at least 4 per side to get a reasonable SPL. Also, the Qts is fairly high (0.89) and the Fs is only 52Hz. So an extended bass shelf BR alignment looks a little wonky, with a very sharp 30dB/octave roll off below tuning. Below is a WinISD alignment using 4 per side in a 1.5 cu. ft. box tuned to 28Hz. Even with 35 watts input, which would push them slightly over xmax, you only get about 98dB per side. If you attempted to plug the port and convert it into a 1.5 cu.ft. sealed box instead, then you would probably need to add a subwoofer. But the tall, thin cabinet would look really cool.
3-way with an oval sub.
Looks like the discount is official (see post #7 in link below). There will also be a sidewalk sale going on.
https://techtalk.parts-express.com/forum/tech-talk-forum/1504815-2024-speaker-design-competition
I have no plans but I already feel my wallet warming up.
Think everyone has tightened up a little and thus might be more inventory/things to shed, or at least I know that problem some companies are facing where have to run promotions to move things which may mean more stuff to pick from. Though have not thought about any wish list items to pick up to use discount.
ND28F is now $13. After the discount, just over $10.
Have a build experiment in mind that would require physical modification. Low opportunity cost if i screw it up.
That's a great price. Be sure to run an impedance sweep on them right away. I ended up with a pair that didn't match. One was fairly close to spec but the other had an obvious problem. PE sent me another one and it didn't match either of the first two! This was over 5 years ago, but I'm still a little leery of PEs QC when it comes to tweeters.