Dayton Audio Sig series

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#344
I posted some measurements of the SIG180-4:

keantoken said:
I was able to experiment with a SIG180-4 in a 12.26L box.

The distortion measurement above doesn't really look right based on my experience.

Some quirks of this driver:

At 1.2KHz there is a peak due to an abrupt change in directivity, so in a bookshelf speaker you would want to be listening below the axis of the woofer since it gets worse when you listen in front of the tweeter.
Around 500Hz there is a wolf note that is very audble but hard to find in the measurements. It corresponds to peaks in both the 5th and 7th harmonic and a minimum of the 3rd harmonic.
The 3rd harmonic peaks around 3KHz, but this is not a localized phenomenon, it is just the motor's 3rd harmonic coming out through the acoustic response. In any sane crossover the 3rd harmonic will not peak so much.

In terms of the sound I can get it to sound pretty good, but not so much so that I don't feel drawn toward my SDS160 or other few woofers I have to see if they might sound better.

Plain distortion chart:
View attachment 1383464

Same chart but with the harmonics plotted at their natural frequencies. Notice the 7th harmonic peak at 600Hz:
View attachment 1383465

Same data, but this time plotted with the harmonics normalized to SPL at the harmonic frequency. The lines become straight, showing that the distortions present here are mainly consequences of normal motor and suspension behavior:

View attachment 1383466

Distortion with a notch filter and 1st order crossover:
View attachment 1383475
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#345
Studley said:
I did think about the W024. I should mention that whichever I choose I’m going to use 2 of them per side.
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I use two of them per side right now - works great, and they have several great things going on for them. Yes the price is up there, but you get a better motor, more space for air on the rear around the magnet, better cone, classic neutral looks, and a response that leaves a lot more room for a wide possibility for all the other drivers you wish to use with it. I put them together in 75 liters closed cabinet, and that fits great with a smooth clean response to way above my 500Hz cross over, and they play easily deep, so that I have a broad overlap with my subwoofers. No matter the EQ or cabinet - I find them way cleaner, detailed and easier to work with, than my prior SB 23NRX drivers. They also present that richness of sound in cello's and deeper instruments and voices better - IMO. And this is all in the same room, cabinet, amplifiers, EQ and everything. Until now, the only driver that I really am happy with overall. I think this has something to do with the harder cone of the WO24P. The other Satori drivers seem to have a "softer" cone, like the other drivers from SB. And I think it is that hard-cone approach with a more extended response and less internal damping, that gives me what I want 🙂
 
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#349
I saw that. The 10KHz peak is less pronounced but the 3KHz peak is worse. Ultimately it doesn't matter because both woofers need a notch filter anyway.

It still has a peak in the impedance at 490Hz, so I expect it to behave just like the more expensive version. It also has different motor parts (thinner, rough finish), hard to tell if it has the same shorting. I would guess this is the same woofer that is used in Dayton's new active bookshelf speakers.

The impedance appears to be the same in the treble so maybe it also has the same shorting arrangement. Mms is lower, so maybe the increased woofer peak comes from a lighter coil/former?
 
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#351
I will say, one downside to this series is they are so prone to cone damage, I had a small screw fall into one and it's cosmetically ruined, a paper cone with a dust cap probably would have likely come out of that incident with any visual damage. I have a 150 as well that looks to have maybe been handled with a finger pressing on the back and there is an ever so slight bend to the cone, nearly invisible but still frustrating.
 
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#353
Yes, something similar happened to me. It has a few dents, but the response was unaffected as far as I can tell. The upside is, I no longer need to be careful around this woofer.

It would be interesting to cut loose and attempt giving it a dimple treatment. Still an expensive loss though if it turns out unusable.
 
#354
wafflesomd said:
I will say, one downside to this series is they are so prone to cone damage, I had a small screw fall into one and it's cosmetically ruined, a paper cone with a dust cap probably would have likely come out of that incident with any visual damage. I have a 150 as well that looks to have maybe been handled with a finger pressing on the back and there is an ever so slight bend to the cone, nearly invisible but still frustrating.
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A mistake many designers make is to use the lightest, thinnest cone possible. The difference between the tinfoil versions and one that is real world robust is less than 1db in SPL efficiency. The difference in the loudspeaker characteristics is marked.
 
#355
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