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Get familiar with the reaction system: Introducing the Reaction System
"Pinan" - a 2-way for beginners
Coming soon... Here is a teaser:
I developed these in parallel with the MCM/Vifa 2-way I just completed. These are done, all measurements taken. I am doing a very ambitious write-up, however, and it is taking me a lot longer than I expected.
I developed these in parallel with the MCM/Vifa 2-way I just completed. These are done, all measurements taken. I am doing a very ambitious write-up, however, and it is taking me a lot longer than I expected.
I have a signature.
Comments
Chuck, should be able to squeak by, but impedance may be a bit low for sissy amps.
These are in the Denovo 0.23 knockdowns, tuned with a pair of PE 1" ports. I corner loaded the ports to try and extend the tuning down a bit more.
Both drivers are surface mounted, with the backside of the woofer cutout chamfered.
Tweeter response on baffle:
Woofer response on baffle:
Tweeter is a little rough, but offers pretty low distortion otherwise. The dip fills in off-axis, so no sense in trying to figure out a way to fill it in using a high Q crossover.
Modeled response:
Measured response:
Distortion, SPL accurate, 1M:
Areas to improve would be suppressing the top end of the woofer a little more, but I have a long game in mind here. I want to see how much of a drop-in the revised model of this woofer will be. With the addition of a shorting ring, I am guessing that will result in a drop in distortion in that area.
Measured on-axis, reverse null, and impedance:
Impedance shows the ~55Hz tuning, and phase stays within +/-40 degrees. Easy to drive for pretty much any amplifier out there - important when designing towards beginners.
Both channels overlaid:
Red/Yellow is sample one, silver/pink is sample two. I'll take this from less than $80 worth of drivers.
Horizontal response:
I'll take that, as well.
Crossover:
Five components? OK! Woofer is S1, tweeter is S2.
Baffle is easy - woofer is 3-3/4" from the bottom and the tweeter is 8-1/2" from the bottom. Cabinet dimensions are available on the PE website.
Crossover cart via PE:
I think I oopsed a 5 instead of 5.6 ohm resistor, but it is such a serious pain in the peehole to put together shopping carts on PE that I elected to use the error version I created.
Those new crossover boards from PE are pretty cool:
I used parts from my extensive collection to build these, but I do recommend the Audyn caps from PE whole heartedly. FYI, that is the assembled, soldered and glued crossover. Pretty slick results with those bakelite breadboards.
...and some driver porn:
I think anyone who has used or heard these woofers understands what a special value they are. This design is no different. They are exceptional midbasses and offer above average performance in the upper mids. I suspect the addition of the shorting ring will elevate them into serious contender for "best cheap driver ever". I love these little woofers!
The room and reflections will do more to it before getting to your ears than the dip itself anyway.
Also, yes - this tweeter is a prime example of why taking real measurements is so critical. Without knowing it fills in off-axis, one may be tempted to try and fill it in somehow. The simulators cannot properly predict off-axis behavior of a driver - IMHO that is where they fall "flat", if I may be allowed a small pun.
Nick, want them over Christmas?
I know why, too. When I was doing initial voicing, testing, and listening I was doing so with them toed in, directly on-axis.
In normal listening, however, this off-axis behavior impacts things:
A substantial loss of energy above 3K occurs (given the high crossover point, essentially the entire output of the tweeter), so to avoid the "head in a vice sweet spot", raising the top end a bit more may be needed. When I toed them in and sat her in the sweet spot, she said they "came to life".
As I generally voice towards little to no toe in, I am going to raise the tweeter level a few db. Doing so will require nothing more than paralleling a 6.8ohm resistor across the existing series resistor, preserving the option for both levels to exist.
That being said, these little woofers are blowing me away with the bass reproduction. I have always been impressed with them in that regards, but dang. I wasn't kidding about the "not needing a subwoofer" comment.
Looking at the 45 degree plot, these tweeters would work well 2nd order LR at 2K on a custom, angled baffle.
Just got over a 101 feaver and virus myself. Inly 50%, but good enough to be back at work.
Hope the fam feels better.
These are very well built as usual , heafty and finished in the black duratex , nice nickle satin speaker terminals . Got them home and had to take a picture of them under the tree. I had the day off, and spun up some various music , not sure why but ended up playing alot of techno trax through them . There was some details I havent heard in the past which was a pleasant surprise , I wouldve thought if that was the case, it wouldve been fatiguing which it was not. The more the more I cranked the volume the more they really opened up , Im not sure what the over all sensativity is, but they did like to crank , Im using an old panasonic saxr55 as my front end FWIW. These are nice JR and thank you , I think they need some wood accents on the side the more I looked and listened