Here's how BC does it:
http://www.diyaudio.com/forums/subw...30-ft30-pa-th-awesomeness-46.html#post2612895
http://www.diyaudio.com/forums/subw...30-ft30-pa-th-awesomeness-46.html#post2612895
Deal of the Day - Dayton 15" for $164.00!!!!!!!
Head's up boys!!!!
Parts-Express.com has the 15" on their the Deal of the Day feature:
Dayton Audio PA385S-8 15" Pro Subwoofer 4" VC 8 Ohm | 295-040
I used the coupon code "save5" for a final price of only $164.00.
Head's up boys!!!!
Parts-Express.com has the 15" on their the Deal of the Day feature:
Dayton Audio PA385S-8 15" Pro Subwoofer 4" VC 8 Ohm | 295-040
I used the coupon code "save5" for a final price of only $164.00.
PE Deal of the Day - Dayton 18"
The Dayton 18" is on sale - today only:
https://www.parts-express.com/dayton-audio-pa465s-8-18-pro-subwoofer-4-vc-8-ohm--295-042
The Dayton 18" is on sale - today only:
https://www.parts-express.com/dayton-audio-pa465s-8-18-pro-subwoofer-4-vc-8-ohm--295-042
Well I bought four of the Dayton Pro PA385-S 15" drivers for $164 each during the recent sale. Overall I am pretty impressed - these boys are beefy.
The only real criticism so far is that the rubber gaskets on the back of the drivers were not full pressed on during the manufacturing process. I had to try to carefully reapply them, with mixed results. I will probably have to use additional gasket material if I use these drivers in anything other than a tapped horn.
I dropped one into a Gallien-Kruegar bass cabinet to give it a quick test. This was a 3.5 - 4 cubic foot ported cabinet. It is tuned for bass guitar instead of a true subwoofer, but it definitely got LOUD!!!! I put 700 watts RMS into it and it didn't fart out at all. So far so good.
I am still trying to learn how to properly design a tapped horn, so that is a work in progress. But this driver looks to be fairly well suited for a tapped horn desing.
I also did a rough reverse engineering of one of Bill Fitzmaurice's Titan 48 subwoofers, and it also seems to be pretty impressive in that style of front loaded horn also.
I have further been experimenting with some smaller ported BR boxes. Two of my favorites designs are a 3.5 cubic foot box tuned to 40 Hz, and a 4.0 cubic foot box tuned to 38Hz.
I plan to build a few different prototypes of some of these various designs over the spring and summer. If anyone wants to share an interesting design of theirs using this woofer, I would appreciate your input. Thanks
The only real criticism so far is that the rubber gaskets on the back of the drivers were not full pressed on during the manufacturing process. I had to try to carefully reapply them, with mixed results. I will probably have to use additional gasket material if I use these drivers in anything other than a tapped horn.
I dropped one into a Gallien-Kruegar bass cabinet to give it a quick test. This was a 3.5 - 4 cubic foot ported cabinet. It is tuned for bass guitar instead of a true subwoofer, but it definitely got LOUD!!!! I put 700 watts RMS into it and it didn't fart out at all. So far so good.
I am still trying to learn how to properly design a tapped horn, so that is a work in progress. But this driver looks to be fairly well suited for a tapped horn desing.
I also did a rough reverse engineering of one of Bill Fitzmaurice's Titan 48 subwoofers, and it also seems to be pretty impressive in that style of front loaded horn also.
I have further been experimenting with some smaller ported BR boxes. Two of my favorites designs are a 3.5 cubic foot box tuned to 40 Hz, and a 4.0 cubic foot box tuned to 38Hz.
I plan to build a few different prototypes of some of these various designs over the spring and summer. If anyone wants to share an interesting design of theirs using this woofer, I would appreciate your input. Thanks
DHAA, I'd agree about the the T48 thing.
I recently brought them up over on BFM as a possible alternative driver candidate. they dont seem to dig *quite* as low, but they offer about 2 db of sensitivity gain between 40 and 50 (2 db loss between 60 and 80). (this was with the currently published specs)
I recently brought them up over on BFM as a possible alternative driver candidate. they dont seem to dig *quite* as low, but they offer about 2 db of sensitivity gain between 40 and 50 (2 db loss between 60 and 80). (this was with the currently published specs)
I'll post up the results after I shoehorn a dual opposed slot load pair in a 22.5x22.5x26.5 box.
Tried simming a single PA385S in the same size TH with the same Fb, it only does about 122 db flat from 40 to a bit past 100, the dual BR smokes it at the same voltage.
Art
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Al,
I have been following your "subwoofer for metal" thread, and just to introduce myself, I am even older that you - I come from the pre-historic days of metal (Sabbath is NuMetal to me). I am flashing you my "devil fingers" sign right now!
What I was referring to about the tuning is that once you have decided the dimensions of you ported BR box, you can change the post size to determine what you want the lower end of the response to be.
For instance, the lower you tune the cab, the better the lower the response you will get. But the draw back is that it will hit XMAX (fart out) with less wattage, so it won't get as loud.
On the other hand, if you tune it higher, you typically will have a peak in your response at a higher frequency, but the response will drop rapidly below that. This will allow the speaker to take higher wattage and go louder, but without the real low frequency response.
A lot of bass guitar cabs aren't really capable of playing the fundamental of the lowest strings. What you are hearing is really just the harmonics, but you ears fool you. That allows bass guitar cab makers to build smaller, easier to transport bass cabs - most bass players don't realize what they are missing. I have used these types of cabinets for PA subwoofers, and they worked fine. But a lot of guys at this forum are going for real low bass, flat down to the 30 or 40 Hz range. They like to laugh at us old me that freak out when their pant legs start shaking for the intense low frequencies.
There are some great FREE computer programs you can do speaker modeling in now. I am really liking Hornresp, but to just simply illustrate what I am talking about, WinISD is even easier to use.
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Hey, you old fart. We played Sabbath as loud as we could in Nam just to **** off the neighbors. The "Devils Fingers" were brought to this modern world by Dio. His grandmother disciplined the children with this threat. Ron's uncle trimmed my hair at his shop decades ago. My ex-wife went to grade school with Ron in Truxton.
The original horns are always presented palm out. Remember that the next time you see a poser displaying the back side of his hand.
I truly appreciate the time you take to help me.
My strange highway takes me to a mono 18" sub that shuts down under 40Hz but gives me 2 octaves of 120db.
Art calls it a bass killer, but I have an active 40Hz hi-pass filter. (also a 500uf 220V NP cap) if need be.
For some strange reason I want to take a basic 18" BR cab, like the EV TL 505 and modify the duct to except a lower Fs driver with more X-mass.
If I tune the cab lower than needed, I can employ the 40Hz filter to stop nonsense while maintaining a nice flat 40~160.
The techno and rave are for the kids, and I hope they do well. I do not like rap and hip hop.
Well my Friend, how do you like me now? Al.
The original horns are always presented palm out. Remember that the next time you see a poser displaying the back side of his hand.
I truly appreciate the time you take to help me.
My strange highway takes me to a mono 18" sub that shuts down under 40Hz but gives me 2 octaves of 120db.
Art calls it a bass killer, but I have an active 40Hz hi-pass filter. (also a 500uf 220V NP cap) if need be.
For some strange reason I want to take a basic 18" BR cab, like the EV TL 505 and modify the duct to except a lower Fs driver with more X-mass.
If I tune the cab lower than needed, I can employ the 40Hz filter to stop nonsense while maintaining a nice flat 40~160.
The techno and rave are for the kids, and I hope they do well. I do not like rap and hip hop.
Well my Friend, how do you like me now? Al.
Al,
The 40Hz hi-pass filter is a bass killer, the 500uf cap is an amp killer
.Using a heavy, low sensitivity, low Fs driver tuned low (to avoid a giant hump at a higher Fb), then throwing the low bass away is a waste of potential, and will get far less output using far more power than using the Dayton driver(s).
With your available power, two of the cheap Dayton 15" mounted PP in your 18" TL505 would mop the floor compared to the SI 18" in all but the <40 stuff you don't seem to care for.
Art
I agreed with you until about a year or two ago. Then I actually listened to Eminem's lyrics. HA, the dude is a total comedian. Once I could figure out what he was saying I about had a heart attack I was laughing so hard. He has amazingly disgusting lyrics. Here is one of my favorites:
Eminem - White Trash Party Lyrics - YouTube
OK, now back to the subwoofer subject. There are some amazing people here on this forum that can be of great help. The more I hang out here, the more I want my subs to have even lower extension. A lot of the new metal has a fair amount of content under 40 Hz. Sabbath even used to tune down to C# (around 35 Hz on a few songs.
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I contacted a PRV distributor (Chris @ Martin Sound) at the end of January, who then contacted the factory. This was their reply:
"18SW2200 L(e) 2.733 mH @ 1kHz"
Cheers,
Justin
I contacted a PRV distributor (Chris @ Martin Sound) at the end of January, who then contacted the factory. This was their reply:
"18SW2200 L(e) 2.733 mH @ 1kHz"
Cheers,
Justin
alright. believe I've just about finished the fold for the adjusted version of JWMBros pa 385 "mini othorn" design.
unfortunatly, horn resp cannot accuratly sim this fold (or the othorn fold for that matter) because within the section encompassed by l23 theres actually like... 3, increasing flare rates). I guess you could toss in an exp flare for l23 to get it a bit closer to what the actual fold is, but I wont know how it really does till i build it (might even be next week).
response is no where near as pretty as the original, powerhandling isnt as high (lower CR), and width has been increased to 20" external, but its still half decent.
unfortunatly, horn resp cannot accuratly sim this fold (or the othorn fold for that matter) because within the section encompassed by l23 theres actually like... 3, increasing flare rates). I guess you could toss in an exp flare for l23 to get it a bit closer to what the actual fold is, but I wont know how it really does till i build it (might even be next week).
response is no where near as pretty as the original, powerhandling isnt as high (lower CR), and width has been increased to 20" external, but its still half decent.
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