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My Microwrecker build ( with either kicker cvx-15 or pa mofo 152x /154x) - Page 2

post #31 of 68
Thread Starter 
low volume clip with just a single microwrecker going couldnt turn it up or run both as it really over powered the mic
post #32 of 68
Thread Starter 
3 hours into my gig and these r going strong i had one instance were the amp was clipping and i didnt relize it i could smell the coils getting hot but no damage, 2/3 more hours to go
post #33 of 68
Everything survive?
post #34 of 68
Thread Starter 
6 hours continous playing and they took it like a champ . other then the one instance were i let the amp clip they worked flawlessly
i got so many compliments on the sound system.
, though when i build more the building may not survive , when u walk outside the building u can hear the roof ratling and the steel panels on the outside of the building rattling lmao
post #35 of 68
Thread Starter 
lilmike when i build the next pair ill make a nice lil writeup like u have for the f20 this way its a lil easier for ppl to build these
post #36 of 68
Did I email you the instructions I am working on? There are three or four other builds currently, and I can't keep up with who has what. The design has not changed or anything, I just put together a quick set of plans for someone.
post #37 of 68
Thread Starter 
the only thing u emailed me was the sketchup drawings and cutlist

to be perfectly honest i dont think this box needs assembly directions it was very simple to figure out what panel to put in first then go from there


btw i stuck one in my truck and wow it works great as a car audio box as well if u have the room to put it in lol , id seriously consider 2 of theese for my truck but i dont think the cap on the bed would survive it
post #38 of 68
Thread Starter 
lmao i played with theese some more today just cant get enough, even moved them over to my bigger amp today the extra 100 watts rms makes a good bit of difference
needless to say i have to bolt these to the floor as they like to move themselves around

lilmike any plans for a 12 or 18inch version of theese ???
post #39 of 68
Quote:
Originally Posted by davece View Post

lmao i played with theese some more today just cant get enough, even moved them over to my bigger amp today the extra 100 watts rms makes a good bit of difference
needless to say i have to bolt these to the floor as they like to move themselves around

lilmike any plans for a 12 or 18inch version of theese ???

Mine stayed put just fine when fed over a kilowatt. You might need to do a better job on your bracing. How are they oriented?

I could see making it narrower and running a 12, but not an 18. This fold is just too small for an 18 to be loaded into it, even if I made it wider.
post #40 of 68
Thread Starter 
Quote:
Originally Posted by lilmike View Post

Mine stayed put just fine when fed over a kilowatt. You might need to do a better job on your bracing. How are they oriented?

I could see making it narrower and running a 12, but not an 18. This fold is just too small for an 18 to be loaded into it, even if I made it wider.

i have them standing up with the driver on the bottom ,im pretty sure the bracing is fine , i think its just cause the old hardwood floor in room vibrates alot, ill have to stick my camera on the floor and take a video to show u how much it vibrates all over the room, hell even the walls vibrate

i think a 12inch driver version would be badass , wish i knew enough that i could help u come up with a 12inch version
Edited by davece - 6/4/13 at 11:09pm
post #41 of 68
Biggest issue with a 12" version is finding the "right" driver for it.

I have several ideas about drivers that might work, but as usual, I have more ideas than time to play.
post #42 of 68
Thread Starter 
lil mike since im building a bunch more what are ur thoughts on 1inch thick mdf versus 3/4 osb since thats all i can get fr a decent price around here

im assuming 1inch mdf would be stronger then the 3/4 osb except that the mdf version would weigh a hell of alot more ,
post #43 of 68
MDF sucks.

More importantly, using 1" material instead of 3/4" would mean that all the internal dimensions get messed up.

Stick with 3/4" and brace it well.
post #44 of 68
Quote:
Originally Posted by lilmike View Post

Biggest issue with a 12" version is finding the "right" driver for it.

I have several ideas about drivers that might work, but as usual, I have more ideas than time to play.

I thought we found some pretty good woofers to slap in one of these, no?
post #45 of 68
Thread Starter 
Quote:
Originally Posted by lilmike View Post

MDF sucks.

More importantly, using 1" material instead of 3/4" would mean that all the internal dimensions get messed up.

Stick with 3/4" and brace it well.

didnt even think of the internal dimensions getting screwed up , just thought the thicker mdf might be stronger and easier to put a decent finish on

still need to finish off the first two i built , i have a gallon of truck bedliner i might try , as it will prolly be more durable then paint in my application
post #46 of 68
Quote:
Originally Posted by Jim Walter View Post

I thought we found some pretty good woofers to slap in one of these, no?

Need to try one and see, will be a while though - no time for fun stuff at the moment. Type Rs look to want a lower tune based on specs alone.
post #47 of 68
Resurrect the dual Type R 12" biggrin.gif
post #48 of 68
Thread Starter 
i am willing to do the testing , my main reason for wanting to build a 12 inch version is for my car, my camaro has a roll cage going in so the back seat area is useless , the micro wrecker almost fits its about 1.75 inches to wide and about 4 inches to tall, to lay into that area with the mouth facing up

i did manage to put a single micro wrecker in the back of my pickup truck it damn near blew the cap off the bed of the truck , im willing to bet a 12 inch version of it would be flat out badass in the back of the camaro
post #49 of 68
Thread Starter 
btw here is my other camaro

89 v6 rs camaro turbocharged 3.1L v6 made over 350hp on the dyno @ 9psi




this system does just shy of 150db in the car and has taken many 1st place victorys at db drag racing competitions

yes i am a bass head lmao
post #50 of 68
Quote:
Originally Posted by chrapladm View Post

Resurrect the dual Type R 12" biggrin.gif

It never died.

I'm looking for a single-driver cabinet. The TypeR 12 almost works in this one at 14.5"
post #51 of 68
Quote:
Originally Posted by davece View Post

i am willing to do the testing , my main reason for wanting to build a 12 inch version is for my car, my camaro has a roll cage going in so the back seat area is useless , the micro wrecker almost fits its about 1.75 inches to wide and about 4 inches to tall, to lay into that area with the mouth facing up

i did manage to put a single micro wrecker in the back of my pickup truck it damn near blew the cap off the bed of the truck , im willing to bet a 12 inch version of it would be flat out badass in the back of the camaro

Need to get your measuring gear squared away. I can draw up the plans easily enough, but I need to know what we've got when you're done.
post #52 of 68
Thread Starter 
Quote:
Originally Posted by lilmike View Post

Need to get your measuring gear squared away. I can draw up the plans easily enough, but I need to know what we've got when you're done.

what kind of gear am i looking at?
post #53 of 68
In order to know what the box is doing, I need accurate SPL and impedance measurements.

Can get both with REW, but takes a bit of effort and money to set up a measurement rig.

If we're gonna experiment with drivers I don't know, I need accurate thiele small parameters to work with. This too can be done with REW, but you've gotta know what you're doing to get decent results.

What have you got for measuring gear now?
post #54 of 68
Thread Starter 
only thing i have right now is an spl meter , whats the cost on REW?

might be able to get my hands on a termlab setup
http://www.termpro.com/storefront/termlab.asp
post #55 of 68
Rew is free from HTS. Just need a Mic with a calibration file and your set. You have a SPL meter so your almost there.
post #56 of 68
Calibration is nice, but not 100% needed. Just use a mic that is accurate enough. I use my homemade mic as often as my $$ mics. When the wands only cost me a bit of time and a few bucks, I don't mind experimenting with them.

Biggest issue is accurate impedance measurements. REW can do it, but it takes a special impedance rig to do it well. I get decent results with V2 of my impedance rig, but I am still working out the kinks.
post #57 of 68
Thread Starter 
did u look at that termlab stuff? im going to talk to my friend today but he should let me borrow it if it will work
post #58 of 68
"HANGOVER - Whenever a loud vehicle is measured with a microphone, the microphone diaphragm is altered in some way. Although I do not have the ability to determine why this is the case, I do have a hypothesis. Mic diaphragms must be very, very light in order to minimize their mass. This results in a very thin membrane material. I believe that exposure to high SPL's actually distorts or "stretches" the diaphragm.

You can try this yourself. Use a pistonphone calibrator to calibrate your microphone. Put the mic in a loud vehicle and then "burp" it. Next, immediately place the mic back in the calibrator and test it again. You will notice that the reading is off by as much as 10 dB. Continue to check the calibration every minute. After 6-8 minutes, the mic should read "close" to what it was originally calibrated for. In most cases, it won't be what it was when you first calibrated the mic. And, in many instances, it can be off by several dB.

Term-LAB doesn't require any calibration. In addition, you can burp it repeatedly and it will produce the same reading. (The sensor in Term-LAB is rated for SPL's in excess of 200 dB although the sensor assembly is currently configured for SPL's to 183 dB.)"

that is kind of interesting.
post #59 of 68
Quote:
Originally Posted by davece View Post

did u look at that termlab stuff? im going to talk to my friend today but he should let me borrow it if it will work

Might work, might not. Seriously though, Termlab is way past overkill for measuring the performance of a typical sub.
No need to measure at war volume, 1 watt, 10 watts, and 100 watts is usually enough to get a picture of what is going on, and if the SPL is too high, you can always measure things with the microphone further back.

I use a Panasonic WM-61A capsule modded per Linkwitz's instructions, driven with a modified version of Linkwitz's circuit. Works fine from 60 dB up to about 130, when I start clipping the sound card.
post #60 of 68
Thread Starter 
yeah i figured id was overkill but its was just something i have access to

ill stick with REW and if u could link me to some mics to consider buying id greatly apreciate it
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