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duanebrow

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Posts posted by duanebrow

  1. Posted

    diff subs. diff amp. diff car. enclosure. music. song. to many different things lol but thanks for tryin to help me hit better

    LOL. You didn't say at what frequency you hit your 141 at. Simply tuning closer to your peak frequency will give you a lot more spl normally. I understand that you don't want a spl box, I just brought it up because you could get a much higher number if sounding good doesn't matter.

    As far as things that could help spl, adding bracing to the box or deadening the truck would be a good place to start I think.

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  2. Posted · Edited by Duane

    ya i was looking at the gcon or the dcon... one of the two....

    my max dimensions are

    Height 21"

    bottom depth 29"

    top depth 21" ( due to seat angles)

    length 40"

    I have a question about the gcon... can i run it in a single 4 ohm load at 500wrms? or no?

    Yes you can. You need the Dual 2 version of the sub to get a 4 ohm load btw.

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  8. Posted

    All the fancy horns and TL type stuff is a waste of time is what I am trying to say. It has it's place but it's just not practical for anyone but 3/4,000,000,000 of the people out there.

    They become too much, and too hard to build.

    I have found tapered TL's work for speakers that want really small boxes tuned low. They are no harder to build than a slot ported box. Horns, yes, they are a PITA because of the size.

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  9. Posted

    LOL. I guess what I modeled would be called a reverse taper, offset, rear loaded horn. But that is how you model a TL in hornresp.

    The taper, or area of the of the exit, can also affect the tuning.

    The ported designs are EBS types. So they are giving up efficiency for extension. This is why they model at a lower spl per watt. Also I used different programs for the different designs so that could be a variable.

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  10. Posted

    I used hornresp to model a transmission line (TL). If Sundown's specs are correct, I think that the sa-12 is a good driver for this type of box. fr starts to roll off at 20hz. Volume is just over 2 cf. Plus it is about 2-3 db more efficient than a vented box.

    The biggest reason to use this type of box over a ported box is because it doesn't use a "port". When you tune a ported enclosure really low the port gets really long. And you need a big port for this driver, making the box bigger. So a TL ends up being smaller overall.

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  11. Posted

    Many plate amps have a ssf/highpass at ~20hz. So you may want to check into it. I would also model a 2.5cf box @20hz. This keeps excursion down to 14mm @500watts. You aren't gaining much with a bigger box.

    There is a new version of winisd on facebook btw.

    Have fun,

    Duane

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  17. Posted

    I'm on my phone, so I might miss a few things. As far as the ohms being 5.5 - I would think that is fine. If you did damage to the drivers they will make noise when you use them. Like the vc rubbing. I have seen very high power change the T/S specs before though. But that is a whole different subject.

    With WinISD, yes it will give you some crazy numbers. It is just giving you a starting point based off of the drivers specs. You need to play with the box size and tuning to get a design that works for you. Fwiw - many car audio subs have a qts of about .5 this makes the "ideal" size box very big. But if you use a smaller box it will give a boost to the low end and roll off slower below tuning.

    Get the latest version of WinISD from their Facebook page. Try modeling your sa-8s in WinISD, put in your box design and see what you get.

    Alright, thats what I did previously. But I felt like I didn't know enough about the output plots to really know what was going on. I also figured that the models would be very far off from the actual response, but I suppose using such a program gives a good guess...

    It is closer for home use than in a car. there are better programs out there but they are much more difficult to use. You can have a null in a room where the subs output is canceled out by its reflection, moving the sub is a good way to check this out. (And some rooms just suck out bass) Anyway, have fun.

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  18. Posted

    I'm on my phone, so I might miss a few things. As far as the ohms being 5.5 - I would think that is fine. If you did damage to the drivers they will make noise when you use them. Like the vc rubbing. I have seen very high power change the T/S specs before though. But that is a whole different subject.

    With WinISD, yes it will give you some crazy numbers. It is just giving you a starting point based off of the drivers specs. You need to play with the box size and tuning to get a design that works for you. Fwiw - many car audio subs have a qts of about .5 this makes the "ideal" size box very big. But if you use a smaller box it will give a boost to the low end and roll off slower below tuning.

    Get the latest version of WinISD from their Facebook page. Try modeling your sa-8s in WinISD, put in your box design and see what you get.

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  19. Posted

    I had a 8" sub in my house that did very well in a 19*30 room. I would check do the battery check to make sure they are in phase. Move the sub around to check for the best placement. Both of these have been suggested already, so this is move of a +1. Also, did you model your design? Or just guess?

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  20. Posted

    how do you plan on removing the port? I would add wood decreasing the height of the port. You can add several to adjust the tuning to what ever you want. try it out first before you glue.

    The calculators are often high on their tuning frequency. The port doesn't end at the end of the port wall if three of the sides of the port are really the box and continue. Your car can also affect the tuning. You can use a simple jig and LIMP (it is part of ARTA - goggle it.) to get your box tuning in seconds.

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  21. Posted

    I think you are on the right track with a crown amp. I have not shopped for a avr in years. So I can't recommend anything there. I would look at the voltage output for the lfe output. Pro amps often want more voltage the the home stuff. Do you have any specs on the subs? I know that tc sounds subs work well in small boxes, but that seems really small.

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  23. Posted

    If you go to the spl tab on WinISD I would guess that you will see the gcon has more spl at the same power as the sa. Better power handling and a higher xmax of the gcon will lend it to getting louder, with lower distortion, than the sa - if you have room for the larger box. Every sub has trade offs, SSA and Sundown chose different ones.

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