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Dayton Audio DA115-8 4" Aluminum Cone Woofer
Is this magnetically shielded?
I see that it isn't mentioned in the description, so I'm guessing this means no, and what does this mean for having a self-powered sub with a toroidal transformer in the cabinet with it?
No, it is not magnetically shielded. If you can see the ferrite magnet you can be sure it isn't shielded, for future reference. Usually shielded speakers have a metal cup over the magnet, and inside that cup is another magnet. That is called a "bucking magnet", which negates the stray magnetic fields outside the donut shaped "motor magnet". Exceptions would be speakers with neodymium, or other rare earth magnets. These have a smaller, focused magnetic field with little stray, so they are in a sense self shielded (also called faux-shielding).In response to your question about its effects of being near a toroidal transformer, it could be a problem. Any outside magnetic field will affect the operation of your transformer. However, since the magnet will not be moving, it should not induce voltage in the transformer. Really, to ensure minimal interference keep the speaker magnet and 1.5 times its width away from any inductor or transformer. Not a hard and fast rule, but it seems to work on smaller speakers. So, since this magnet appears to be about 3" across, keep it at least 4.5" away from your transformer.
Date published: 2012-04-23
What would the max listing area for these be, Would it be able to put out decent levels in large spaces, or would a larger woofer, ex 8PR-8 be better for a large space
no, they wont fill a large room alone. it is just a 4". they could do much better in pairs with the addition of a sub.
Date published: 2011-04-22
Are these ok to crossover above 2.5k?
Yep. These are almost suitable for single-driver applications if it weren't for the mid-treble dip. The mid-treble dip will have to be taken into account when designing the crossover -- you would have more overlap between your drivers. The problem with that is that it would reduce the overall impedance of the speaker, which may or may not be acceptable. Now if you do cross them at 2,500, you get to take advantage of the mid-treble dip and use a simpler, lower order crossover.
Date published: 2011-09-07
Would this woofer be good in a passive radiator alignment?
Yes, this woofer would work in a passive radiator (PR) box. A rough indicator of what type of box a woofer can be used in is the efficiency-bandwidth product: EBP = Fs/Qes. If the EBP is greater than 100 then the woofer is best used in a vented or PR box (vented and PR boxes are functionally exactly the same). If it is less than 50 then it is best used in a sealed box. If it is 50 to 100 then either type will do.In the case of this woofer it is EBP = 59/0.5 = 118. So, it would be best used in a vented or PR box.I would suggest an "optimum" PR box configuration for this woofer, but with PR boxes there are so many variables that an optimum design doesn't really exist. I would suggest that you try out a box simulation program that can simulate PR boxes. One such program that is free is WinISD Pro (I use it all the time). When simulating the box, pay careful attention to the excursion of the passive radiator(s) because it's fairly easy to make them go beyond their excursion limits if not designed properly.
Date published: 2012-03-03
optimum ported enclosure
what would the optimum ported enclosure volume be for this woofer? also, how might this woofer compare to the Dayton Audio DS115-8 4" Designer Series Woofer?
This woofer looks to do quite well in a 0.1 - 0.2 cubic foot enclosure, tuned to ~60hz. My sugestion would be a 0.15 cubic foot with a 1" diameter by 3" long port, that will give you an f3 of 58hz.The 4" designer series woofer does well in the .15 60hz enclosure, but can handle a little bit more power and has higher xmax so it can get a bit louder (~3dB).The designer series does have a large peak between 5-6khz while this one has a dip between about 2.5-7khz.The natural dip of this one may help with crossover design but the peak in the DS woofer is going to be a problem. A 3rd or 4th order crossover around 2-2.5k may be enough to bury it, otherwise you need a notch filter.
Date published: 2013-09-18
Would these speakers sound harsh crossed at 3k
Would these speakers sound harsh crossed at 3k in an mtm design? also could i get response down 45hz with these speakers?
No, these speakers don't exhibit a lot of distortion at 3000 Hz, so that shouldn't be too much of a concern.What is a concern is that there is a significant drop in output from about 2300 Hz-6500 Hz. A drop of about 5-8 decibels over that band actually! If you plan to use an off the shelf crossover the speakers will be noticeably quieter from 2300 Hz-3000Hz. If you plan to build your own crossover, like you should :), this needs to be considered carefully in your design. As does a rise in impedance over the same frequency band. With thoughtful crossover design you can actually use these quirks to your advantage.Food for thought:Let's say that you are planning on building a Linkwitz-Riley parallel crossover, as most people like to. You can drop your crossover point a bit to 2400 Hz and use the natural rolloff of the woofers to steepen your crossover slope. You could get away with a simple 1st order low pass filter and a have a slope that measures and sounds like a 2nd order (-12db/octave)! Then you can put a 2nd order electrical high pass filter, at the same frequency, on your tweeter and have nicely matched slopes that sum pretty flat (with an Lpad to match levels of course).Alternatively, you could keep your woofers crossed over at 3kHz and have both your woofers and tweeter with matching higher order electrical filters (both 2nd, or 3rd, or 4th, or whatever). This would leave a dip in response from the woofer, but you could accommodate this by lowering your tweeter's crossover point a bit so it can fill in. How much would depend on how high of an order electrical crossover you use. This should be okay, because the impedance of your woofers starts getting pretty high around that frequency. It's about 10 ohms @ 2500 Hz for one woofer, so 20 ohms for 2 in series (MTM). So backing your tweeters crossover point down will actually help drop the impedance down back toward nominal values around the crossover point (since it will be running in parallel to the series woofers).So, there are some things to think about when designing with this speaker. I hope you find them helpful, if not you should have stopped reading after the first sentence, ya know, back when I actually answered your question : )
Date published: 2013-06-08