i picked up these two drivers about 12 years ago in a trade with my brother....they have never been hooked up and are in original packaging.....they came with a couple of recommended enclosure designs that i dont care for - i wanted to do an infinite baffle with them but ive been told by many expierienced people that these drivers are not suitable for such an application....they have all reccommended a "ported" enclosure which brought me here - the home wrecker plans really intrigue me and i want to see if anyone who knows what the driver parameters mean in relationship to whether or not they would be suitable for this enclosure - i will list the only info i have on them....they must no longer be manufactured because i can find very little info on them....and yes i know Radioshack woofers arent the most desirable...but im willing to build the box and see how they perform unless someone tells me it not worth the effort...ok   here is the info i have:

Radio Shack Cat, No. 40-1309 (18" Subwoofer)

Nominal Impedance........................... 8 ohms
DC Resistance (RE)............................ 6.83 ohms
Free Air Response............................. 16.5 hz
Equivalent Air Volume(VAS)............... 41 Ft3
Moving Mass (Mms)........................... 192.6 Grams
Mechanical Q (QMS)........................... 1.986
Electrical Q (QES)............................... 0.225
Total Q (QTS)..................................... 0.20
Peak Power Handling........................ 200 Watts
Peak-to-Peak Linear Excursion(XD)... 6.1 mm
Gap Flux Density(BG)......................... 7850 Gauss (+/- 200 Gauss)


can anyone advise me on using these in this application?? - also the room that this will box will be in has 15' ceilings....does this matter with the top mounted port?? it seems like there will be alot of travel before the sound hits its first "reflective" plane?

i want to load both drivers in one HWK and i have 2 Marantz ME-500 amps to run them - does this all add up to a smile on my face or will i be dissapointed.....any help will be appreciated

its too hard to say for sure, build a housewrecker, try your drivers, if they dont work get different ones but you should only build the hw if you want alot of bass in a big room.

Well Ron, Status report please.  :)

(Not sooo many periods this time)

Bob

Sorry Bob for leaving you hanging. John probably does not remember but i wrote him personally asking about the drivers and he explained to me many reasons why i would be dissapointed using these woofers in this enclosure, so i never built it. At the moment im just using an old box i had built a few years ago for a mustang i used to have, its got a couple of 10" kickers in it. It is both unattractive and weak sounding with the system, but it is what i got..lol - ive been scouring sites looking for a deal on some suitable IB drivers considering that would be the most desirable situation for me - i have the perfect location for this setup and by placing my "car box" along that wall, the acoustics seem desirable. Very soon i think i will just get ahold of 4 of the partsexpress IB 15's and get it over with.

All hope is not lost with these drivers yet - I've found myself wrapping my brain around MLK's transmission line pages. I must admit that i find alot of it confusing but i think i have the basic idea figured out, and i have really high ceilings so i think i may expieriment with a transmission line just to see how they perform. I drew out a basic plan on "paint" and i will include it, i wanted to iso load the enclosure because of the woofers being low end, but alot of guys are telling me that there is zero advantage to iso loading these types of enclosures so im still thinking it through. Luckily a close friend of mine is a site foreman for a concrete crew and he has offered to order 40' or so of 18" sonotube on the next job and bring it by my house for me to play with, so i can try some different ideas and see what results i get. Others have suggested that i put a speaker 1/3 of the way in a setup to make a "Bose Cannon", but i dont know about that - when i do get an opportunity to try some stuff out ill let you know.

has anyone ever done any work with these lines??
im just wondering what kind of results i can expect and again if these drivers are even suitable.

again i will post my rough idea and leave it open for criticism...lol - i do appreciate all of yours expierience with these things and will always respect your adivce because it beats wasing alot of time and money to just be unhappy with the results.

my microsoft paint skills are as rough as my knowledge of speaker mechanics so please keep an open mind....lol



that may be hard to see so here is the link:

http://i78.photobucket.com/albums/j110/dawgbite/18tl.jpg

well hmmm - i cant get it to get large enough for you guys to see, i wish i could just insert the file, But it is basically a 17' line with one fold in it. I plan to attach 18" sonotube directly to the back of one of the woofers and gradually put a 90 degree fold in the line @ the 5' mark and let the remaining 12' run out like a stack firing towards the ceiling. I wanted to build a minimal sealed box at the front of this woofer to house the other woofer to iso load it to help control the cone movement because of the "cheapness" of these speakers. and i was going to continue these box measurements all the way to house the horizontal run of the tube to anchor it and make it stable. the only drawback to this is that i only really have one choice for placement in the room. it would be located behind behind my tv and center channel in the middle of the room running up the wall towards the peak in the ceiling. My LCD is mounted on a cantilever mount so i can easily manuever the arm around the tube to recenter it to my viewing position.

ok thats enough typing...lol

Ron, that looks like a fun project, keep us posted.  ;D

Bob

post em in the IB thread too!!!