Just got 2 for my sons beater, thanks

 

You can't even buy a Boss 12" for $30!

 

Just grabbed two. I can’t get subs at the flea market for 30 bucks. It was my understanding these sounded decent in a sealed box?

 

People have been doing all sorts of stuff with these (I have yet to read up on it though):

12" JBL speaker $29 on black friday at Bestbuy

Hey guys. For those of you looking for cheap/budget 12" subs for projects, best buy is going to be having the 4 ohm ones on special for black friday. I recently used a jbl gt5 10" for a project and I was surprised how good it is for the $$$...

www.avsforum.com

Based on WinISD modeling, they appear to like big enclosures (3.94 ft^3 sealed for .707 Qtc, 37.6 Hz F3).

1.8 ft^3 for full power while keeping excursion in check (.845 Qtc, 39.7 Hz F3) (blue). Or 7.0 ft^3 vented at 21 Hz, for an 18.2 Hz F3 (green).

Or JBL-recommended 1.75 ft^3 vented at 34 Hz, for a 32.2 Hz F3 and a 4 dB rise at 53.6 Hz (relying on cabin gain for extension).

 

I found a spec sheet for the GX1200 in case anyone is interested:

 

That bandpass design in the manual looks tempting to build for my daily Audi Q5!!!

 

I looked at the same thing. Used several 4th orders before and that one seems easy enough to build

 

Quite a big gap between the 250w RMS power handling in the specs and the big 1,000 watts decal on the cone. But for $30 I can't think of a better deal. I just paid $40 for a pair of old JBLs that won't perform nearly as well.

 

And free shipping? Jeez. Make it up on the volume.

 

I grabbed 2. For that price, why not. I'll probably use them under my coffee table in my upstairs TV room for subs

 

I was going to grab a pair just for backups or experimenting, but they're all sold out around me. Oh well.

 

Update - For some reason, I was unable to order online for shipping. But I chatted with an online support person, and they were able to place the order for me for the sale price with free shipping. Jackpot.

 

I do have a favor to ask of you box gurus. Under my coffee table, I have room for 39" Width X 11.5" Height X 25" Depth. And that leaves ~1" for woofer excursion firing down. Give 3/4" material, that gives me a gross box volume of ~5.1 ft^3. Can someone rough design a slot-vented enclosure? For 2 subs

 

I can do that later this evening. Having already modeled these though, I think 5.1 ft^3 would be a lot better suited to just one driver than two, particularly for home use.

 

Really? 5.1 ft^3? Per JBL, one speaker is 1.75ft^3. 5.1 just seems HUGE for a single 12" driver. Not doubting your recommendations, I just don't understand

 

Depends on the driver in question, and your application, preferences and expectations...

As I posted earlier (post #6), green response curve is one driver in 7.0 ft^3 vented at 21 Hz tuning frequency (Fb), and is what I would consider ideal for home theater and/or stereo use (i.e. flattest response with maximum low frequency extension).

As I posted earlier (post #6), green response curve is JBL-recommended 1.75 ft^3 vented at 34 Hz (intended for in-car use, where space is limited and cabin gain will greatly enhance low frequency extension).

Here's two drivers sharing 5.1 ft^3 (net volume - not including driver and port displacement) vented at 25.5 Hz - the tuning frequency which provides flattest response and maximum extension with lowest F3 (26.6 Hz), which is the frequency at which response is -3 dB).

 

I’ve been burned by Black Friday deals in the past, especially electronics ones that don’t last. However, it appears JBL likely targeted this specific model for volume production, they aren’t offering the deal with other impedences or cone sizes. If there was an 8” and I could buy a few of them….I’d take the chance for sure.

 

received the two I ordered yesterday. The packing was less than desired but all fine with the sub boxes. Basically the stuck the two subs in a large brown box with strip of tape that didnt hold. Basically the box was open showing the contents.
Over the holiday, my son and I will build the bandpass box listed. Should be a fun project to learn some wood cutting for both of us.

 

Just got mine yesterday. Packaged well. These we inside a brown cardboard box:

Still can't believe they were $30/woofer. Couldn't pass that up. Planning on building a sub for my TV room. Anybody have a link to a plate amp I should use? I've never built a home subwoofer before. I looked at parts-express, but don't know what I'm looking for.

 

Place your Parts Express order by 11/21 and save 15% ( use code: HARVEST15 ).

Presuming you're using both drivers, and given that they're rated at 250 W RMS and 4 ohms, you'll want an amp that can do 500 W RMS at either 2 or 8 ohms, or 250 W RMS x 2 at 4 ohms.

If you don't absolutely have to go with a plate amp, I would recommend this (I've been using one of these and also an XLS 1502 for several years, for daily subwoofer duty on two home systems, and love I them):

Home

Crown XLS 1002 DriveCore 2 Power Amplifier 2 x 350W at 4 OhmsThe original XLS DriveCore series of amplifiers from Crown was among the most popular amps in the recorded history of mankind. A perfect storm of power, processing, portability, ease of use, sound quality, and incredibly light weight...

www.parts-express.com

 

Thank you sir. I was hoping to get a plate that I can install in the box.

 

Ended up using this - https://www.parts-express.com/Bash-500S-500W-Digital-Subwoofer-Amplifier-300-752?quantity=1. Especially since it's for an extra TV room, I wasn't going to spend a bunch of money. Put them in a ~5ft^3 ported box. So far, sounds pretty awesome for roughly a $460 investment (wood, amp & speakers). If I can get it dialed in, I may replace the sub in my main TV room. Best Buy must've had a mix up. They sent me another pair. 😆

 

Best Buy must've had a mix up. They sent me another pair. 😆

Love it when that happens! 😁

 

How did these turn out for y'all. I resisted the urge, I have too much gear as it is.

 

I know this is an old thread but @chuyler1 this is a Dayton SA25 on 1.28ft³ downfiring box, tuned to 20hz and uses a Diamond CM310d4 wired to 2ohm.
Guy downstairs can hear it on the other side of the house...at 1/2 volume on the plate, 30/100 on the tv and -15db on the receiver (constant).

IMAX-status in my room.