Announcement

**fpitas** · 05-25-2020, 01:03 PM

Looks like a serious effort!

**LOUT** · 05-25-2020, 04:00 PM

I have an unhealthy amount of love for the PC-series Daytons but I don't remember any 3rd party measurements nor any distortion measurements for them. Looking forward to seeing what you find.

**Wolf** · 05-25-2020, 05:34 PM

The PC105-4 performed well in my Bar-Gain project. I thought I took a HD sweep, but I can't find one that I saved.

Later,
Wolf

**gregrueff** · 05-27-2020, 01:45 PM

W5-1138SMF Results:

Frequency Response
2.83 Vrms @ 4" combined with 2.83 Vrms @ 12" at 500 Hz and 1/6th octave smoothing, adjusted by -10.5 dB to reflect sensitivity at 2.83 Vrms @ 1m.

**gregrueff** · 05-27-2020, 01:48 PM

W5-1138SMF Results:

Harmonic Distortion
All HD testing was taken at 1/48th octave smoothing.
0.5" @ 2.83 Vrms

4" @ 2.83 Vrms which also placed the fundamental at 96 dB

12" @ 96 dB fundamental

24" @ 96 dB fundamental

**gregrueff** · 05-27-2020, 04:58 PM

Because I think it's funny, here is the W5-1138SMF on a 20" wide x 17" tall baffle, located 5" from the bottom & centered hitting LR2 slopes at 2350 Hz with no crossover.

How's that for a low component count?!
HD plots certainly make it look doable. This is not my plan, but it's funny nonetheless.
Didn't someone enter a 2-way build with the 6" version in one of the contests?

Cheers!

**Wolf** · 05-27-2020, 06:29 PM

There was a 2-way with the 1138, but not the 1139. The 1139 will not reach that high.
Wolf

**gregrueff** · 05-28-2020, 06:51 PM

55-5655 Results:

Frequency Response

**gregrueff** · 05-28-2020, 06:57 PM

55-5655 Results:

Harmonic Distortion
0.5" @ 2.83 Vrms

4" @ 2.83 Vrms

4" @ 96 dB fundamental

12" @ 96 dB fundamental

24" @ 96 dB fundamental

**ross.stilling** · 05-29-2020, 07:02 AM

So are you going for a F.A.S.T. design with the 1138 and 55-5655? If so, have you seen the 10F/RS225 thread on diyaudio?

**gregrueff** · 05-29-2020, 05:27 PM

I haven't really followed the F.A.S.T. threads, but I've heard mention of them.

The W5-1138 is for a Bluetooth 2.1 system with the LY302F and OT19. Having and including the LY302F in my testing though gives me the luxury of comparing my results to Faleppa's so that I can potentially see how my drivers stack up to his tests. I'm really just testing all the drivers I have on hand as I go through this learning process.

I thought the 55-5655 was a 4" driver..... I'm not really sure what I'm going to do with it.
The best I can make out, it tests similarly to the RS150 above 300 Hz. My bass HD plots looks high, and I'm wondering if my test baffle set up is contributing, or if I'm still down low on the learning curve.
It also shares similarities to Zaph's driver in the way the HD trends, although not even close to as good (the comparison is natural since they share the same basket and phase plug by the looks of things). That big magnet he put on his definitely makes a difference. I know he also has proprietary and strategically placed copper in his.

This is all in pursuit in selecting a mid-range for my other project, the details of which I won't get into here.

A 3" driver would be ideal, but most of even the best suggest a crossover point of 500 Hz to 750 Hz as you turn up the level.
Most 4" drivers could accommodate a lower crossover point, but a lot of them have a characteristic rising 3rd HD that makes them more suitable for lower crossover points to the tweeter, whereas the 3" drivers really allow you to cross as high as you're willing to make your vertical lobe narrow.

I'm really hoping that the LY401F measures as well as the LY302F, but allows for a lower crossover point given the HD expectations.

Cheers!