Has anyone ever had problems with the JBL PB-12 ? (1 Viewer)

[BryanJ]

Has anyone hear ever had problems with your JBL PB-12 ?
If so what was it ?.
Thanks

 

[Alf S]

I think I've heard a few folks say the JBL's have problem amps, but the "review's" at AudioReview.com seem to show many happy campers with this model.
http://www.audioreview.com/reviews/S...ct_67254.shtml
Good luck!
p.s.
If it were me I'd go for the Sony SA-WM 40 12" sub that I believe is on sale for $149 at Best Buy (or Sears price match) I totally love my Sony.
Alfer
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[ChrisMatson]

The PB line doesn't have many problems. I believe it was the PSW line that was plagued by bad amps. I have had my PB12 for nearly a year now with no problems. I'm sure that it will stomp any little Sony sub, but try them out for yourself.
-Chris

 

[Ron Reda]

BryanJ,
I've had my PB12 for about 3 months now and I really like it. For the price (I got mine online for $265 delivered), I don't think you can beat it. I do have one small beef with it though...during quieter DVD passages, I've noticed that it hums a tad. I never really noticed it when I first got it, but it was one of those things where, once I heard it, I began hearing it all the time (I guess I learned what to listen for). However, that is only a minor nuisance when compared to the joy this little gem has brought me for such a low price. Just from my prior research, I'd suggest that you purchase it from a B&M rather than online. I happened to get lucky making the online purchase, but I have heard of many people who received a unit that was DOA.

 

[Ron Reda]

Sean,
The cable I'm presently using is the only one I've tried. It's the THX-Certified Monstersub cable (I can't remember the model number). Being that the sub is very close to the AC outlet, I even bought one of those Monster SW200 filter/surge protectors and that didn't work either.
As far as different power source, do you mean just switching outlets? If so, I haven't tried that either.
I'm more than open to suggestions because the hum drives me mad!
Thanks,
Ron

 

[Ron Reda]

Sean,
"Do you mean just switching outlets?"
Wow, was that a dumb question or what? Let's just say I've had quite the rough day...
Anyway, I get the hum even when there's no source playing, so I'm assuming that's the ground loop hum, right? Do you have any easy remedies you can suggest?
Thanks,
Ron

 

[Paulus]

Ron
I have the PB-10 and I had the hum problem. My solution was to connect the subwoofers power cable to the power outlet on the back of my reciever (HTR-5280). And now the hum is only there when it's playing and then I don't hear it. No problems with this solution so far.
Paul
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[Ron Reda]

Thanks for the suggestions, Fellas!
The "plugging it into the receiver" option won't work in my application as the the sub is on a side wall and is too far from the receiver.
I'll certainly run an extensions cord this weekend and see if that works. However, I suspect that the sub is picking up the hum because it's only a few inches from the outlet. It may be that I'll just have to relocate it altogether...but it sounds so good in that spot!

Sean,
While I have your attention, I read this post out on Audio Review (on the PB12) that I found interesting and wondered what your thought on it was. Here it is:
"Since my floor is carpet and the subwoofer is a downfire sub i bought a peice of 1" think slab of granite which is a 18" square it relly helps and you will notice a difference in the bass it will be more roomfilling a smoother. I even measured the sound output with the granite and with out the granite.
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Without the granite slab
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25Hz @89dB
30Hz @99dB
35Hz @106dB
40Hz @109dB
50Hz @113dB
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With the granite slab
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25Hz @92dB
30Hz @103dB
35Hz @108dB
40Hz @110dB
50Hz @115dB
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All of those mesuruement were takin from 3 meters distance using a Radio Shack Analog SPL meter, the room size was 19 feet by 28feet with 8 foot ceilings. The subs volume was set in the middle, when i turned it up even more i measured a higher SPL
20Hz @82dB
25Hz @96dB
30Hz @107dB
35Hz @112dB
40Hz @115dB
50Hz @118dB
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That was distortion free bass it was contolled and
not boomy, it was tight and deep the bass was VERRY
loud it gave me a headach after 10 mins of testing."

 

[Ron Reda]

Sean,
I thought it was pretty cool. Hey, for such an inexpensive tweak, I feel it's worth it. Plus, it gives me something to do on my HT! Hopefully, I'll get to it this weekend.
The guest house sounds sweet! I wish I had my own dedicated room. A guy can dream, can't he?
"And best of all the wife will not be a factor, I can put slabs..."
Funny you should say that because I ran it by my fiance last night (the idea of having a big, granite slab in the living room) and she was totally cool with it! I suppose it's always a good idea to check it out with the front office.

 

[Ron Reda]

Yeah, the little lady is cool like that!
I'll tweak away and post something soon...

 

[Barry_B_B]

This sounds interesting; if I can get to Home Depot before they close tonight will aslo try the granite slabs above and below.

 

[MikeEckman]

I have the PB10 and am very happy with it, but I have bottomed it out a couple times. I am considering selling this one to my dad and getting the PB12. Has anyone out there had experience with BOTH subs and is there a significant difference if I upgrade from the 10 to the 12?
And as for quality concerns, I bought mine in May of 2000, and the thing has performed like a champ with no humm at all since then, and I watch quite a few movies. The new Jurassic Park DTS disc roars on it!

 

[Ron Reda]

Barry,
I emailed the guy who posted the "Granite Tweak" and he said that the slab cost $9. To me, that's about as inexpensive a tweak as you're gonn get!

 

[MikeEckman]

Sean, thats kinda what I figured, but this is currently in a small bedroom, so I'll stick with the 10 now, as it already shakes things off the walls, but I will upgrade to the 12 when I move out!

 

[Scott Simonian]

When my friend bought his the first time, the amp was dead. It produced no signal what-so-ever. He returned it and got a new one, works perfect now. He hasnt had a single problem with it since.

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[Ron Reda]

Well, the "granite slab" thing is gonna be harder than I thought. I went to HD and Lowe's yesterday and neither stocks granite slabs. You can order them, but it's like $48 a squre foot! The guy there suggested I go to a rock quarry and visit the "graveyard" there. Basically, it's where all the unused or unsold pieces go. You pick out a piece and they cut it to your specs. I'm not sure if they're open on weekends, so the the story continues...

 

[Mark Austin]

The slab doesn't have to be granite. I used a simple concrete slab from Home Depot for about $3.00.