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  1. #1

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    Default SVS 25-31 PC Plus vs. DIY Sub

    Hi,

    I was just wondering if an SVS 25-31 PC Plus subwoofer would be considered a significant "upgrade" to my DIY sub, which is based on the 15" Dayton Titanic MKIII woofer and 1024W plate amplifier, which I built a DIY enclosure for.

    BTW, the DIY sub is tuned very well - flat to approx. 18Hz.

    Thanks!
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  2. #2

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    I would say, no.

    Something in that league might be able to compare to the new Ultra comming out soon? Even then, I'd think your DIY titanic would have more output.

    There isn't much out there that can compete with a good DIY sub for the money.

    BTW, you have pics of that badboy?

  3. #3

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    Quote Originally Posted by MikeC78 View Post
    I would say, no.

    Something in that league might be able to compare to the new Ultra comming out soon? Even then, I'd think your DIY titanic would have more output.

    There isn't much out there that can compete with a good DIY sub for the money.

    BTW, you have pics of that badboy?
    Thanks! I don't have any pictures of the sub right now...will take many pics when my HT (basement) is finished. Right now stuff is all over the place!
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  4. #4

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    Would like to update this thread -

    I compared my DIY sub to other units costing 2-3 times the price, and I still feel that for the money, a good DIY sub can't be beat. When compared to a DefTech SuperCube Reference, which lists for around $1700, the Dayton Titanic had a tighter, more accurate sound. It was also more musical than the DefTech.

    In a word, you can't beat a DIY sub unless you want to spend a lot of $$$.
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  5. #5

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    My SonoSub kicks but, and cost less then $400 minus amp!
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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  6. #6

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    Quote Originally Posted by ben62670 View Post
    My SonoSub kicks but, and cost less then $400 minus amp!
    Same here - Woofer and enclosure together cost less than $400 (minus amp), and this sub can compete with units costing $1000+.

    I think a good DIY sub for $800-900 (or so) will even compete with the new SVS Ultra!
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  7. #7

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    Quote Originally Posted by appadv View Post
    I think a good DIY sub for $800-900 (or so) will even compete with the new SVS Ultra!

    wha...wha..what?

    thems tall words there broda !!!



    I have wanted to build a DIY sub for awhile...
    not so sure of my skill level though
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  8. #8

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    Quote Originally Posted by beardog03 View Post
    wha...wha..what?

    thems tall words there broda !!!



    I have wanted to build a DIY sub for awhile...
    not so sure of my skill level though
    IMO a good DIY sub can compete with most mass market units.

    Also just re-iterating what MikeC78 said.

    Just my opinion though :)
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  9. #9

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    I see no reason why a guy with the right knowledge couldn`t out build a mass-producer..

    If you buy the same, or better components...why not
    your attention to detail would be outstanding

    I would like to use the 12" momo that I have to make a HT sub..
    I keep watching what you guy`s are doing and taking notes !!
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  10. #10

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    I've got a 1000rms2000peak 12" Shocker sub sitting here from when I competed in car audio comps.....I should turn it into a DIY home sub and sell the velodyne........ :D

  11. #11

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    Quote Originally Posted by beardog03 View Post
    If you buy the same, or better components...why not
    your attention to detail would be outstanding
    That's the key - buy better components and tune the box carefully. And keep on tuning the box until perfection.
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  12. #12

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    Both my DIY subs outperform every sub in my area. Velodyne, a 25-31 plus and a huge Cerwin Vega.

    People come over and are amazed. The only thing is that it doesnt "look" as nice as some, but performs better than all.

    A SVS 12.1 in a 4.1cuft enclosure, port tuned to 22hz with a Rythmik amp.

    All for ~$300. Cant beat that.

    Even my other less expensive 12" Dayton in a 3cuft enclosure with another Rythmik amp, port tuned to 25hz, holds it own.

    And I'm building another for myself and another for a good friend of mine.


    It almost like buying very expinsive speakers, or instead, findind a beautiful vintage pair for next to nothing and putting alittle work into them and having them outperform a that very expinsive speaker.

    But some people just dont want to mess with all of that, so they spend the money.
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  13. #13

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    Quote Originally Posted by jakelm View Post
    Both my DIY subs outperform every sub in my area. Velodyne, a 25-31 plus and a huge Cerwin Vega.

    People come over and are amazed. The only thing is that it doesnt "look" as nice as some, but performs better than all.

    A SVS 12.1 in a 4.1cuft enclosure, port tuned to 22hz with a Rythmik amp.

    All for ~$300. Cant beat that.

    Even my other less expensive 12" Dayton in a 3cuft enclosure with another Rythmik amp, port tuned to 25hz, holds it own.

    And I'm building another for myself and another for a good friend of mine.


    It almost like buying very expinsive speakers, or instead, findind a beautiful vintage pair for next to nothing and putting alittle work into them and having them outperform a that very expinsive speaker.

    But some people just dont want to mess with all of that, so they spend the money.
    Agreed.

    But I'd love to own a mass-market sub someday, like the SVS Ultra, simply due to the fact that it looks nice would blend well (aesthetically) in my room.
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  14. #14

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    Check out these guys...

    www.epiksubwoofers.com

    Nice price, and the "conquest" from what I hear has more output than dual Ultra 13's combined. The dimensions are something to be considered, talk about WAF...

  15. #15

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    Quote Originally Posted by MikeC78 View Post
    Check out these guys...

    www.epiksubwoofers.com

    Nice price, and the "conquest" from what I hear has more output than dual Ultra 13's combined. The dimensions are something to be considered, talk about WAF...
    Wow those are some amazing subs!
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  16. #16

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    So you took a SVS driver, built a better cabinet, slapped a different amp and your getting better performance than the SVS models that use those same drivers? That's pretty impressive. Do you have pics?
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  17. #17

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    Here is my 12" sub. Weight is right around 65ish pounds. Triple stacked magnet.

    I don't think it will ever make HT duty though because the coils are 1/2 ohm each :( I have yet to see a 1 ohm stable home theater amp because of current draw. Maybe if I get 4 of them........I could get a 4 ohm load....
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  18. #18

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    Quote Originally Posted by appadv View Post
    Agreed.

    But I'd love to own a mass-market sub someday, like the SVS Ultra, simply due to the fact that it looks nice would blend well (aesthetically) in my room.
    I would like to try a top of the line SVS, and compare it to my Sonosub. I really think the large sono's would beat the SVS's. Mass market companies could not practically ship a 7x3 foot 100lb+ package via UPS so they have their design limits. Where we can GO LARGE. When I lopped a foot off my tube to comply with Parts expresses advice on encloser design I lost a lot of my lower end extension. Also a thing that needs to be taken into consideration is that most main speakers don't fair well at 60hz, and that is really where you should XO a large Sono at for brain vibrating tight bass (literal vision blurring bass). If you XO
    at 100hz vision blurring, and nose hairs tingling just start to get irritating. Never mind the headaches.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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  19. #19

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    How does one tune a subwoofer?

  20. #20

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    Quote Originally Posted by mmcculloch View Post
    How does one tune a subwoofer?
    Tire iron and a wrench.

    Stick the tire iron through the cone, wiggle a little bit till you get the sound you like.

    Then take the wrench and tighten the speaker cables tight as possible and you are all set.

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    Hmmm... I think I want a second opinion.

  22. #22

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    Quote Originally Posted by mmcculloch View Post
    How does one tune a subwoofer?
    I use a parametric equalizer. I play test tones through my HTPC, whose sound card is fed into the Onkyo TX-SR702, and adjust the sub level to match the level of the other speakers on the AVR. Then, using the parametric EQ on the sub, I play frequency sweeps from 20Hz-80Hz (crossover point) while adjusting the EQ so that the frequency sweeps are as flat as possible.
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  23. #23

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    Now we're getting somewhere. So if someone wants to build their own sub, would they need a parametric EQ to make it worthwhile?

    Now another newbie question. What does "flat" mean?

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    Quote Originally Posted by mmcculloch View Post
    Now we're getting somewhere. So if someone wants to build their own sub, would they need a parametric EQ to make it worthwhile?

    Now another newbie question. What does "flat" mean?
    Yes, I would recommend it.

    Flat means that for all frequencies, the subwoofer plays at a consistent level. Instead of "boomy," where there is an over-emphasis on certain frequencies.
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  25. #25

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    Got it. Thanks.

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    The right driver, box design and amp can get you more performance than most if not all commercial subs. It takes some know how and for the real killer subs, you're going to spend $$$ on the driver(s) and amp. So as a general statement you'll get better performance going DIY.

    Illka just released the numbers on the PB13Ultra and it did very well against some stellar DIY designs. It's on the Shack if you're interested. The Epik subs are basically DIY designs from Chad Kuypers that look to be killer if you don't mind very large.

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  27. #27

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    Quote Originally Posted by mmcculloch View Post
    How does one tune a subwoofer?
    Size of enclosure, port diameter, and port length. Not an EQ. If you need an EQ you F...ed up your box design.
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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  28. #28

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    Quote Originally Posted by ben62670 View Post
    Size of enclosure, port diameter, and port length. Not an EQ. If you need an EQ you F...ed up your box design.
    The room plays a great role too. You could have a very well tuned box design but dips/peaks in the room acoustics require an EQ.
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  29. #29

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    Quote Originally Posted by appadv View Post
    The room plays a great role too. You could have a very well tuned box design but dips/peaks in the room acoustics require an EQ.
    I kinda agree with that. But... big sono's should run at 60 and lower shouldn't have issues with room gain at specific frequencies. Comparing design graphs, and SPL checking with a meter, and signal generator I would strongly suggest not using an EQ unless their was an issue. Bass traps may be in order to settle things down:D
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
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  30. #30

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    Quote Originally Posted by ben62670 View Post
    I kinda agree with that. But... big sono's should run at 60 and lower shouldn't have issues with room gain at specific frequencies. Comparing design graphs, and SPL checking with a meter, and signal generator I would strongly suggest not using an EQ unless their was an issue. Bass traps may be in order to settle things down:D
    In my basement no EQ is needed. But for some reason, my living room requires a filter of -2db at 50Hz, otherwise the 50-60Hz sounds "boomy."
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