Site Links
Howdy, Stranger!
It looks like you're new here. If you want to get involved, click one of these buttons!
Quick Links
Categories
In this Discussion
Please review the site Rules, Terms of Service, and Privacy Policy at your convenience. Rules, TOS, Privacy
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