Logitech Z-2300 Subwoofer Disassembly

Curiosity inspired me to take apart my Z-2300 subwoofer. The grill pried off without much difficulty, and I was even able to reassemble it with minimal cosmetic damage.

WARNING: Perform this disassembly with extreme caution! The enclosure contains a 120V AC transformer. With the Z-2300 turned on, unplug the power cord and wait for the power LED to fade. This will drain the capacitors and minimize the possibility of shock.

Various facts discovered:

  • Subwoofer uses an 8 screw mounting pattern
  • Subwoofer impedance measured at DC: Single voice coil, 6.5 ohms (8 ohms as per specs)
    • The amplifier had no problem driving an external 4 ohm subwoofer in a separate enclosure.
  • Subwoofer construction: Corrugated paper and foam surround.
  • The Z-2300 uses a JRC4565 operational amplifier for pre-amplification and an unidentified chip amp for output amplification
  • EDIT: Satellites and subwoofer use TDA7296 and/or TDA7295 Class AB amplifier IC’s (identified by judeh101)

Potential modifications:

  • As others have done, the enclosure could use some sound dampening material.
  • Replacing the subwoofer with a better made 8″ woofer (polypropylene cone and rubber surrounds) would probably improve sound quality. The amp can handle 4 ohms (based on my limited testing), which means output might even be stronger with such a woofer. However, the amplifier’s 150Hz crossover is fairly high and should ideally be reduced to below 100Hz. If I get around to replacing the sub, I’ll figure out the amplifier circuitry and post that modification.

76 thoughts on “Logitech Z-2300 Subwoofer Disassembly”

  1. Just pry the woofer out after the screws are removed. There is some gasketing that the woofer sticks to, but it should pry free pretty easily.

  2. According to RishiGuru 01-01-2011 at Tomshardware
    the Subwoofer is not Tang Band:
    http://www.tomshardware.co.uk/forum/57164-32-logitech-2300-titans#t382091
    “…Note: Normally people confuse this bass driver as used in Z-680, Z-2200 & Z-2300 with the Tang Band W8-670Q model. Though both units look near identical, Z-2300’s bass driver is different from the W8-670Q in the rear section. It became absolutely certain when my friend’s Z-2300 bass driver went dead and I have to personally contact TangBand via email to ask the model of the driver used in Z-2300 & its price. I also send them the above pictures of the driver to help them identify. To my surprise, they replied after inspecting the pictures sent to them, that this bass driver do not belong to them or in any way or represent any one of their models. But they did agree that they supplied W8-670C drivers for Z-560″…

  3. Hello,

    maybe someone know where is sattelite speakers filter and what could be done for it to widen frequency range from lower, because i missing middle tones.

    Thank You,
    Vytautas

  4. Is it possible to make some photos from the Amp of the Z 2300 ?
    I would be interested how much I would be interested how much µF electrolytic capacitors have both and like the other construction is.

    Can you make some pics please ?

    Thank you 🙂

    1. I think you have a good case, but you will have to file in court in Salt Lake City, Utah. Do you have a copy of unemployment wuthoit the additions, this at least show that from when you left, I said nothing was wrong and since making a tour manager and adds nothing to the report at that time suggests they knew the condition of the property when you left and were fine with it. Therefore, if you have this report that had just gone to court record againist minor for all deposits mantienen.Los problems are, you do not need to do this in the city of Salt Lake, and really do not know what the judge can do I mean if they can demonstrate the work they had to do to get the property in good condition it will be difficult for the judge to decide how much is her fault, how much is not. The judge may decide that you have to pay anything (due to be walking through ok) or, frankly, to make get nothing back if the owner can show the work they had to do it’s a tough call. Anyway, you can send threatening letters and other things, but it is a toothless dog that is, it is likely that you get nothing. If you decide in Salt Lake City courts, you may only need to make two trips out there one to a file and be in court (be sure to submit to the sheriff serving the Department of Commerce). Better luck.

  5. Hi there, my z2300 subwoofer works fine…but the ‘right’ port (to plug the speaker in) stopped working. Do you know if this is an easy fix. If so, how do I get to work again…b/c my speakers and everything else are working fine. Please help!! Thanks!

  6. Hi, great write up.. love the control pod you made.. happy you made this blog post.

    My subsection of the amp has died, or at least my sub has stopped working but the sub was removed and tested and is fine, what would Check first ?

  7. Can anyone help me… My speaker z2300 is not working., only subwoofer hears, and a minute sound on speakers while playing music, when I asked , someone says that’s its ic may be dead.. Can anyone help?

  8. Hi Jseaber!
    I have had my Z-2300 collecting dust for years as I’ve upgraded to “real” speakers and amp but I have used it for trips where it has been possible to take it with me.
    I have been wondering how easily would it be possible to modify the amp to run on a battery as well.
    I’m interested in building a whole single box for all speakers and electronics so it would be more portable, perhaps adding wheels on the box too.
    Battery could be a car battery or some lithium battery as those are pretty affordable these days.
    I have no degree or certification in electronics but I know my way around solder iron and pcbs to a certain degree.
    I have still to disassemble the speakers or plan much anything other than ideas in my head, but I need to know somehow if it’s possible to run it from a battery and I don’t think battery and an inverter would be a smart choice.

    1. Hey Jere, I have a couple ideas for you.

      One way to power the Z-2300 from battery is to use a 12v inverter and not modify the Z-2300 at all. This is really inefficient, but a friend of mine does it this way in his car.

      The toroidal transformer (the big round wire-wound thing) provides 2 ~20VAC supplies to the amp which are rectified (turned into DC from AC) to about +18V and -18V (audio amps require positive and negative voltage to operate properly)

      The datasheet for the amp chips say that can take between 10v and 35v, so two batteries between those voltages should work.

      Connected like this:

      A+[===]- ~B~ +[===]-C

      A: To amp positive power input (DC+ side of rectifier diodes should work)
      B: amp Power (virtual) Ground
      C: To amp negative power input (DC- side of rectifier diodes)

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