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imhungnurnot

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Everything posted by imhungnurnot

  1. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    Hey guys, I'm pretty experienced with car audio so I decided I'd give home audio a try. I am VERY disappointed with the output of the subwoofer/enclosure. I think its due to poor driver selection and poor box design. However, I would like to salvage my build. I just want to know if I am wasting my time or if I should start allover again. I would really like to modify my current box if possible. Goals: The main use is for music, possibly some video gaming, and possibly some movies. Background: To begin, I had a pair of SA-8's in my car then when the v2's came out I decided that I would get a pair of v2's for my car and put the old pair in my house. This was mainly an excuse to cough up the money for the new v2's lol. So I bought a BASH 500W plate amplifier to power the pair. I then designed a box that I thought was a good design. I started off with the box design from my car. 1.3cuft with one 4" aero port tuned to 35Hz. I decided that I would need to increase the box volume since I would have less power to drive the woofers. I decided to go with 1.8cuft. I also dropped the tuning frequency to 26Hz. Pictures: Here is a picture of the setup in my car, and below is a couple of pictures of the enclosure I built for my house. Problems: First off, I noticed the speakers moving a lot and hardly any air moving the the port. Things shake in the house but the audible output is very poor. I used a 4'' aero port down-fired and I left about 3.5 inches between the exit of the port and the floor so that I would be able to breathe freely. Initial thought was that the box was too large so I stuffed it with 7-8 pairs of jeans (tightly packed in). There was a a slight increase of audible output but nothing significant. Solutions: Next step is to take my box out of my car and see how it performs in the house since thats easy to check. Do you guys have any suggestions? Is my design horrible? Is this not even worth trying to fix? Let me know what you think. Thanks, -Kelly
  2. Read the instructions again. It says "plug in T/S specs from .... to ....". This is where the fs, qes, and vas from. These are T/S specs. Input your target vent air speed into the "vent mach" section. It is incorrectly denoted as vent mach when it is really speed that you are inputting. As it notes, 10m/s is low and 45m/s is high. This is the speed at which the air in the port will be excited. Lower the target vent air speed, the larger port area it will recommend. You want to get the lowest air speed possible in the port so that the enclosure functions as a ported enclosure rather than a leaky sealed box. In my experience, it can be difficult to physically design an enclosure with a low vent speed and a low tuning frequency due to the excessively long ports that this requires. (This is more problematic in small enclosures.) So, you have to compromise port area or tuning. Easiest is port area since this really only becomes and issue as the sub(s) begin to travel a lot.As the sub(s) travels longer distances in the same time (ie you turn up the gain/volume while playing the same frequency), the air speed in the port increases. As far as sacrificing tuning, as long as you get it to within +/- 2-3 Hz of what you originally planned you'll probably be happy. If you tune to 35, theoretically your setup should peak in output at that frequency. Well thats assuming an ideal environment and cars are very non-ideal environments. In the end, the modeling that those formulas utilize only goes so far so don't get too hung up on the design aspect when it comes to those calculators. They are great to use as a starting point. But where i've noticed the biggest difference is overall layout of the enclosure (ie sub/port firing direction, port loading, spacial relationship between sub and port, air flow inside of enclosure, etc.). Thats where the real experienced members can help. So this turned out to be a lot longer post than I expected, but all of this is what i've learned from my experience. Goodluck with the build.
  3. imhungnurnot

    Ethos sample 12" T/S parameters

    Just stumbled upon this but I really enjoy analyzing, to the best of my ability, the FEA results and testing results you post during your the design process if your subwoofers. I am about to graduate from LSU as a mechanical engineer. I spent many hours last semester designing a structure for our senior project using Solidwork's FEA software so I can appreciate your work. What software did you use to get the above testing results?
  4. imhungnurnot

    What are some really good deep hitting 12s?

    Here's a video of my old setup to give you an idea of a single 15" setup. Its a DD 9515g powered by a Sundown SAZ 2500. http://youtu.be/5hLyVvVaxEI
  5. imhungnurnot

    Alpine PDX 4.150 4 channel 600 watt amp

    "...and hardware not included with amplifier" ^^What do you mean by this? I understand these amps have plugs that you use to terminate the speaker wires. I dont know why you'd sell it without those, but I want to verify you are selling them with the amp.
  6. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    Just did a little testing in a smaller room. WOW so much louder! I will do more testing when everyone is awake tomorrow. lol
  7. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    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...
  8. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    I checked with a battery and the subs are in phase. I did not model the design since everytime I have done so WinISD tells me that I need get a bigger room... lol I'll tell me I need a 27 cuft box for a single 12...... I understand it is optimizing for a flat response, but thats just ridiculous. However, I am using a computer, and we all know "GARBAGE IN, GARBAGE OUT." There is a chance that I am doing something totally wrong. Have you ever experienced this problem when modeling enclosures? Also, I did drive these subs with about 1500 watts for a while. Maybe they're cooked... I noticed that the pair measures 5.5Ohm when I wired it to be 4Ohm. So I feel that I may have done some damage to the coils. However, I did not notice a problem with this when running them in my car. Maybe I'm only noticing this now with the reduced power available? I would like to drop my v2s in the box to see, but I would need to cut the mounting holes larger...
  9. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    That would be a easy/simple solution. However, I actually double checked the wiring, but I can check again.
  10. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    Actually, I was testing the woofer in the living room (which is connected to the kitchen, and dining area). So I was testing in a very large space. I am planning to use it in a much smaller room. I will try it out in a smaller room and let you guys know how it turns out.
  11. imhungnurnot

    Get your b-stock Damp & Damp Pro!

    so what classifies the product as B-stock? why did it not meet your quality control specifications?
  12. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    I'll give that a try..
  13. imhungnurnot

    Subwoofer Enclosure Help!! (2) SA-8's

    Could you elaborate? The subs are moving at least 1.75'' full throw.. I've heard a single bose 5'' sub for a computer sound system get louder than what I have.. the 5" sub may have been moving 0.5'' full throw... lol
  14. imhungnurnot

    SA-8 v.2 Pre-Order Updates

    mine came in yesterday.. I'll be cutting the holes in my box for my previous SA 8s in the morning to fit the v2's... lol I tried to go drop them in but no luck. The magnet barely fit through the hole for the older SA8's.. (7 1/4'' dia hole... sick magnet for an 8!) My old SA 8's are about to get mounted in my newest enclosure... 1.8 cuft, 4'' aero tuned to 26 Hz, 500 watt plate amp..... home theater setup?? lol I have no idea what home theater enthusiasts would say about the setup, but hopefully i'll be pleased! I'll post some pictures once I stain and seal the box!!
  15. imhungnurnot

    show of hands of those who have ran the 4500D @.25 ohms

    more business for DB-R!!!!!
  16. imhungnurnot

    Getting it done with 8's

    I have a pair of SA 8's with about 1.4 cuft and a single 4'' aero port (18'' flared length, yields about 36hz tuning IIRC) I don't have port noise issues until I am really stroking them. I have the pair wired to 1 ohm on my SAZ2500 . lol.. So I am really putting some power to them. I doubt ''Jordan Guess'' will be putting that much power on them. I think he would be satisfied with a similar setup. Checkout my video below.
  17. imhungnurnot

    !!! Sundown SA-8 v.2 PRE-ORDER !!!

    Just sent my payment for (2) D4's!! I think i forgot to send you my shipping address so I emailed that to you. Can't wait to get them in!
  18. imhungnurnot

    !!! Sundown SA-8 v.2 PRE-ORDER !!!

    The SA-8 v.2 is a LARGE order of magnitude superior to the original SA-8 in terms of mechanical clearance, stability, and noise. Any output gains would be 35 Hz on down -- if that is what you want the v.2 is definitely for you. If your 8s move alot the v.2 will be a better driver overall. I don't think I have the original SAs. I have the version with the "8 leg" basket. How does the v.2 compare with the "8 leg" basket version?
  19. imhungnurnot

    2006 Acura RSX-S

    Ha, yea thats why i've never committed to doing it. That alternator is hard to get to. I'm sure if you take the intake manifold off you can get to it, but I'll only get that if I buy a high flow manifold. So I still haven't started on the big three.
  20. imhungnurnot

    2006 Acura RSX-S

    To start: Alpine INA-W900BT w/ Imprint add on Front Stage: Bravox 6.5 carbon fiber component set (can't remember model #) SAX 100.4D Sub Stage: DD 9515g dual 0.5 ohm Box: (3) 4'' aeros, 4.1 net cuft @ 36 Hz SAZ 2500D Electrical: KnuKoncepts wiring Tiny battery upfront Stock alt Big three Deka Intimidator G31 in the back Stinger Battery Isolator (high current relay)
  21. imhungnurnot

    !!! Sundown SA-8 v.2 PRE-ORDER !!!

    I currently have a pair of SA 8s on my SAZ 2500D @ 1 ohm. I am wondering if there will be an audible difference by swapping my current 8s and for a pair of the v2's. If so, will this be in output and/or quality? I know that the SA 8's power rating (any version) is limited to the sub's mechanical limits. How does the v2 compare to the old version when considering it's mechanical limit? Some of the testing posted earlier in this thread may answer my question. However, I am not sure how to interpret those plots. I am wondering because I can really stroke those 8's with the power I have and I absolutely love them . I really want to get the new version IF i'll be able to hear a difference. I know some of you will be hesitant to answer this because it is VERY install dependent. Just assume that they are installed appropriately when responding. Thanks, -Kelly
  22. imhungnurnot

    2006 Acura RSX-S

    Update: XS D5100R under hood no big 3 (yet) So I clamped my amp with the sub wired to 1 ohm. At 44 Hz, my rise was 3.5 ohm and my power was 1200. Then we did it again with the sub wired to 0.25. At 44 Hz, my rise was 1.5 and my power was 3700. Now, I wish I would have had a scope on that, but I probably clipped pretty badly. Anyway, I ran the car with the sub wired at 0.25. 148.8 Hz in the kick on a term lab using the globe. 2.1 db gain!
  23. imhungnurnot

    2006 Acura RSX-S

    Well the goal is to see what load my amp is seeing.. And then what? burp it at my peak frequency with the sub wired to 0.25 ohm.... if the amp doesn't s load smaller than about 0.6-0.7
  24. imhungnurnot

    SA-8 pre-ordered, time to build a box!

    Complete sentences help us understand what you are trying to say. First off, you need to realize that a single dual 2ohm woofer can either be wired to 1 ohm or 4 ohms. It CANNOT be wired to 2ohms. As far as the enclosure volume goes, I am not sure since I have not had any experience with these woofers (yet). However, I you are going to double the RMS you probably want to stick to the lower end of the recommended range. You may be fine going all the way down to 0.6 cuft (the lowest recommended volume). I will leave that to someone else that has some experience with these woofers.
  25. imhungnurnot

    SA-8 Pre-Order Thread for June 2011

    ~20 lbs Just paypal'ed you the money for two D4s!!!!
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