I got a db drive PLT10D sub at a pretty good price. I was wanting to build a vented enclosure and was having trouble trying to find information on the port. db drive's website for manuals is under construction and it was an open box deal so no paperwork for it. Anyone have a manual for this speaker or any ideas about the port? Thanks for the help
The PLT10D sub specs (voice coils in series) per the sub's manual: FS: 27 Qts: .46 Qms: 5.08 Qes: .51 Vas: 1.34 Xmax: .3 Re: 7.8 Pe: 750/1500 Le: 3.43 Sens: 86db Sealed encloser: .6 cubic feet (net) Ported: 1.35 Cu ft (net) Port Frequency (fb): 35Hz (You can tune down to 32hz no worries) Port Diameter: 3" (round port) Port Length: 10.5" If you have any questions, don't hesitate to ask, I'm a db drive dealer.
86 dB of sensitivity? OUCH!!!!!! one woofer of 93 dB of sensitivity would be like 3 times the amp power , for free....... hey steamhammer, yall got some free samples of your subs for me to test? Not tryin to slam anyones producr, I just like to play with different things to see how they perform from a cost standpoint......
Hey, Thanx for the help steam, I actually broke down and harrased their tech support dept to get the information by phone. Website was down and couldn't get anyone to answer emails. Took a bit, but I finally got it. I guess I should have posted to let yall know. Thanx again and if have any more questions I'll hit yall up.
Hey Steamhammer I was just looking at the specs you gave me and realized something. The specs they gave me for the port was 3"x3"x8" square or 3" round by 8". I was always under the impression that the port size worked by volumn. It didn't sound correct and I even double checked to be sure I understood what he was saying. I checked to see what the volumn of the the two ports would be and the 3"x3"x8" square has relatively the same volumn as the 3" x 10.5" round port that you gave me. I built the box with the 3"x8" round port, so I'm guessing that its out of tune. It sounds good at low volumns, but when you put the power to it it seems to lose its low end. Do you think replacing the port will fix this and how big of a difference do you think it will make. Most of the boxes that I have built have been sealed so I'm new to building ported enclosures. I know that I have the correct volumn of the enclosure so I don't believe that is an issue. Thnx again for your help.
vents, or ports if you will have to take many things into consideration. Box volume, speaker parameters, type of sound you want, the enviorment that its going into........ A 3 inch round vent does not have the same area as a 3 inch square vent, but you already figured that out! If the 3 inch square vent (9 square inches) at 8 inches long tunes the box to say, 35 Hz (just throwing out a number), then a 3 inch round vent (7.06 square inches) at 8 inches long would tune the box at more like 30 Hz. the point i am making is that the VOLUME of the port is not what your after, you want a known specific area of the vent, then figure out what length you need.for that area to tune the box to the desired frequency. Basically the larger the vent area, the longer it needs to be to achieve the same tuning frequency of a smaller port. There ae a few ways to test the tuning frequency of your sub box. One simple way is to hook your sub amp up to a signal generator. slowly sweep the frequency, while looking at the top of the woofer. when the woofer appears to be not moving, that is when port velocity is at its max and the enclosre is at resonance. then look at what freq. is being fed into the amp. its not a perfect method, but will give you a close idea.....
For the most part the sensitivity number is meaningless since there is little control on how it is measured from sub to sub. Many of your high powered 10" subs are "inneficient". JL 10w6: 83db, 10w7: 84db, IDMAX: 86db, Adire Brahma 10: 83db. 86db, looks pretty good to me, assuming all things equal. I have the PLT12D and it's a great sub for the $$$. With 600w tuned to 31hz it can wang, plays tight and fast on metal/rock and has good SQ for some jazz. Free samples? I don't even get free samples. But you are welcome to buy one and try it out. I'll swing you a deal. If you are interested in db drive's SPL/Daily Driver sub the PLW12D2.. I sent one off to participate in the great 12" sub challange. You can track the activities here: http://forum.realmofexcursion.com/forumdisplay.php?f=58 among other places. I've had this sub and it is meant to bump or burp and it does each quite well. With 1200w it will blur your vision and it dumped like a truck in a box tuned to 31hz. We soon shall see how well it will do for a 249.00MSRP sub. I don't do SPL comps so I've never had it metered.
Yup, or you can use a box building program to determine the proper square port. Howerver I much prefer the Precision Ports from partsexpress.com. It adds about 15-20.00 to the cost of the box but it generally reduces the box size and makes building the box easier. Plus you can test tune it with various frequencies before final glueing. Email your box dimentions to scott_at_doppelgangeraudio_dot_com and I'll plug them into bassbox pro and tell you what you are tuned to. I'm guessing you are too high.
Yeah, Danny is a busy guy, doing tech support for all the DB Research companies (db drive, quantum audio, and hypnotic audio). He knows his stuff once you can get him on the phone.
Actually, sensitivity is key in certain types of systems. most importantly SPL systems. The most efficient speakers can make or break a run. I know alot of manufacturers are not on the up and up on the ratings, and as a matter of fact, most people dont even know what the rating is for. another issue that can be attributed to sensitivity is SQ systems, the more efficient the speakers, the greater the overall dynamic range an amplifier can produce. Over the years of my car audio career,I have learned one or two things. I look for key aspects in what I choose or reccomend. right or wrong, i am set in my ways!!!!
