Just installed a new system in my '97 Grand Cherokee. Pioneer Premier head unit ; Mbquart components in front doors and Mbquart 2-ways in rear doors ; U.S.acoustics 4065 4 channel amp(for door speakers) ; 12" Alpine type-r in a 1.0 cube sealed box ; Hifonics bx1000d mono amp(for sub). The sub doesn't have that hard hitting tight bass like I expected. Should I sell the sub and try a different sub?- Or maybe the amp?(Dont think its the amp though)Any ideas??
Pull the type r out of the sealed box , and go ported. Somewhere in the neighborhood of 2 cuft and tuned to 30-35hz . Night and day difference my brother.
Enclosure, Enclosure, Enclosure Your sound is 90% enclosure and only 10% product. The only difrrence between myself and Ramos is I would tune a little higher, around 38-40 Hz
I'd say ported tuned around what Ranger said...Ramos...have you heard a Type R in a box tuned around 38-40 or are you just goin by what you've heard it tuned to around 30-35. Just wondering.
Let me explain my reasoning. If the dawg is not happy with the way it hits, I think it has to do with not enough gain above flat responce. Even though the sealed box is small and we are getting some relative gain, its too high. By using a ported box, around 2-2.5 cu. ft. (I would try go for half way) and a tuning around 38-40, that should put our gain around 50-60 Hz. The relative gain in the sealed box is higher and it rolls off sooner. If I can get Thiele/Small parameters for the speaker I can generate exact numbers.
Yes sir, played with the r's 10", 12", and 15" in a wide variety of enclosures. From my experience they flat out suck in sealed enclosures.Ported is the way to go with the R's . We played with tuning for several months . Metering different tuning frequency's . We tried from 25hz ( way to low ) to 50hz ( way to high ) and the sweet spot was in the neighborhood of 30-40hz. Of course a lot has to do with the automobile itself. We were testing in a co workers civic.
http://www.alpine-usa.com/images/products/documents/OM_SWR-1242D.pdf There ya go , he didn't mention wether he had dual 2's or 4's. And how they are wired . Which could also be part of the problem.
I will probly try to build a ported box then. By the way, it is dual 4 ohm so I have it wired to 2 ohms.
I love designing boxes, can you post the following Qts Qms Qes Vas (is it in cu ft, cu. meters, what unit is it in) FS SD not needed but helpful Re, Le, Xmax Im also need to know the length of your truck, from the front windshield to the back windshield. And the inside width, driver window to passenger window.
Think you can do that for me too. I havent decided whcih subs yet so it will be a while. Right now im thinking about Infinity Reference. Do you like them?
Reference is a good speaker. Yes I would and I would need the same info. Also if you drive something strange like a pickup, I will also need to know how much space I have available for the box.
I really like the Reference series speakers, they perform well, durable, and they sound good. We have had lots of luck with this speaker.
Qts=.47 Qms=7.89 Qes=.50 Vas=45L(1.6 cu ft) Fs=29 Hz Sd=480 cm Re=3.7+3.7 Le=3.71mH/1.67mH Xmax=18.2mm The length of Grand Cherokee is 10 feet and width is 5 feet.
Your vehicle has a resonant frequency around 50 Hz. So what we need is a box with a natural peak around that frequency. The box needs to have an internal volume of between 2.4 and 2.5 cu ft. We also need to have one 4-inch port 5-inches long. If your using 3/4-inch MDF then a box with the outside dimensions of 26-Wide X 16-Deep X 14-Tall will get you there. The port should be near the speaker (within 6-8-inches). I always use PVC for my ports.
The amp only has dual inputs for easier hookup of multiple woofers. You can wire each sub's coil in parallen then to one of the inputs on the amp...Then do the same for the other. Building a ported box is not a pain in the but...Basically same design as a sealed but with a hole and a tube. What is so difficult about this?
Looks like a pain in the @ss to build a ported box. I am thinking about just adding another type-r and build a sealed box for 2 12's. The amp is a Hifonics bx1000d rated at 1000 watts @ 1 ohm. Also the amp has 2 positives and 2 negatives for speaker outputs. The subs are dual 4 ohm. Can I wire the subs for a 1 ohm load to the amp? If so, How would I do this??
You only need 1 more cu ft for two 12-woofers. So your outside dimensions should be 34-Wide X 17-Deep X 14-Tall. You will also need 2 4-inch ports. Both ports will need to be 8-inches long. Nothing works better than a properly tune ported box. Please you really need to give this a try. If you can build a sealed box, you can do this. Like Aznboi3644 said "its just a sealed box with a hole in it". One other thing, one woofer in a ported box will in most cases easily out perform two in a sealed box. Give it a try, you can do this.