Results 1 to 8 of 8

Thread: Advice on JBL 18Ti Bookshelf speakers

  1. #1
    Junior Member
    Join Date
    Sep 2008
    Location
    Australia
    Posts
    3

    Advice on JBL 18Ti Bookshelf speakers

    Hey everybody, I'm new here, so, Hello!
    Anyway, at the moment I am using a mixture of components for sound.
    The main source is my PC, into which I recently installed a Creative Soundblaster Audigy 2 ZS sound card.
    The main amp is an older one that my brother built. It is stereo 100w x 100w. Unfortunately that is about all the info on it I have except for the fact that it is a two piece set. One piece is a relatively small main head which has the PCB and is surrounded in heat sinks. Then it connects via a "speakon" or something cable to the power supply which is roughly the size of an average audio receiver and has 4 giant capacitors and a really big toroidal transformer.
    The output is my father's old set of JBL 18Ti bookshelf's. Titanium tweeter, 6" woofer, 45hz-27000hz. http://www.audioheritage.org/vbullet...ad.php?t=10622
    Very good speakers, although recently I've been having a few problems. I've noticed that in the left one, there is a tiny rattle of some sort. It really is apparent around 1000-2000hz or so. It sounds almost like something could be stuck in the voice coil.
    Another thing I've noticed is, despite their supposed ability to withstand up to 200watts, at relatively loud volumes, the midrange becomes worryingly muddy and colored, mainly I would say in the realm of 1k - 3k. You can hear it very clearly with something like the Fur Elise and many piano pieces.
    Please, any advice would be greatly appreciated because these are very good speakers. Even now they still retain a very powerful bass, the high are very clear and they sound quite amazing with heavy rock like music, but I really want to be able to enjoy more delicate music at elevated volumes.

  2. #2
    Obsolete
    Join Date
    Apr 2003
    Location
    NLA
    Posts
    14,548
    Quote Originally Posted by Jeddyb View Post
    Another thing I've noticed is, despite their supposed ability to withstand up to 200watts, at relatively loud volumes, the midrange becomes worryingly muddy and colored, mainly I would say in the realm of 1k - 3k. You can hear it very clearly with something like the Fur Elise and many piano pieces.
    It is a known liability with that 6.5" polycone.

  3. #3
    Junior Member
    Join Date
    Sep 2008
    Location
    Australia
    Posts
    3
    I see, do you think getting them reconed would make a difference?

  4. #4
    Senior Member duaneage's Avatar
    Join Date
    Jan 2005
    Location
    The First State
    Posts
    1,587
    I doubt a recone would make a difference if it is a known problem. These are small speakers, 100-200 watts is a bit much for their size.
    Why buy used when you can build your own?

  5. #5
    Senior Member BMWCCA's Avatar
    Join Date
    Feb 2006
    Location
    Virginia
    Posts
    7,190
    As I read it, he's got two problems: 1). a rattle, 2). mid-range mush.

    Depending on the problem, the rattle might well be fixed with a re-cone though the 115H-1 may well still be available new from the Pro site for the 4406 monitor, though I don't see it. Regardless, L20Ts with the same LF speaker can be bought for a paltry sum quite frequently. Certainly less than the price of a cone kit.

    That being said, I've run my L20Ts pretty darn loud using a 200wpc Crown amp and find the speakers' performance remarkable for the size. Are you sure you're not hobbling your JBLs with whatever program material you're feeding them via your PC? How large a space are you trying to fill?

  6. #6
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    8,482
    That being said, I've run my L20Ts pretty darn loud using a 200wpc Crown amp and find the speakers' performance remarkable for the size.
    I have agree with you, one of my small speaker favorites. Especially when you consider what you can get a pair for. Put a decent sub under them and it's a real hoot!

    Rob
    "I could be arguing in my spare time"

  7. #7
    Senior Member porschedpm's Avatar
    Join Date
    May 2004
    Location
    Reno/SF Bay Area
    Posts
    483
    Quote Originally Posted by Jeddyb View Post
    ...recently I've been having a few problems. I've noticed that in the left one, there is a tiny rattle of some sort....
    One of my 18Ti's also had a subtle 'buzz' or rattle as you put it. It wasn't very loud but once you heard it your ear would go right to it whenever that speaker was on. I isolated it to the woofer although I'm not sure if it was a problem with the voice coil since the DCR stil read 4.5. I 'fixed' it by finding a replacement 115H-1 woofer on eBay for $80.

  8. #8
    Junior Member
    Join Date
    Sep 2008
    Location
    Australia
    Posts
    3
    Hey guys, I know this thread is ancient, but I though I might just say what I did with the speakers in case anyone else has a similar problem and want advice. It seems like the last time one of them was reconed, the guy did a bit of a dodgy job of gluing the cone to the surround and so I simply took it upon myself touch up the those loose areas and they seem to have no problems now.

    Also might I just say, oh boy! For a while I've had them going through a highpass filter running along side a sub, but just a couple days ago I took off the filter and let them loose and I was really very surprised at well they can handle themselves, it also gave me a chance to turn the low pass filter on the sub right down to like 60Hz or so and it also sounds so much better not having to deal with all the midbass frequencies.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. The most awesome set of custom jbl speakers
    By gene in forum Lansing Product DIY Forum
    Replies: 33
    Last Post: 02-27-2013, 02:39 PM
  2. Old JBL speakers
    By CENTURY in forum Lansing Product General Information
    Replies: 12
    Last Post: 05-16-2008, 08:54 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •