Ways to Document a Blown LSi9 Driver

praedet
praedet Posts: 314
edited March 2012 in Troubleshooting
Well, due to me being an idiot, I have either blown part of the crossover, or the mid bass driver in my two LSi9s...

I was trying to un-hook a new preamp that was not working and did not cut the power to the amp (like an idiot :() so when the rcas hit the ground the thump blew something. There does not appear to be any distortion through the tweeter, but I believe the top of the two drivers is gone in both (this is from only sending a signal to the tweeter, or the mid-low-end). Anybody know what kind of resistance I should get if I measure across the driver (blown vs. good)

Is it possible something in one of the two cross-overs went? They are Skiing Ninja modified units...

Ted
HT: Ninja Master LSi9s, Ninja Master LSiC, Slightly Modded LSiFXs, Modded LSi7s, Outlaw LFM-1 EX and Polk PSW125
Outlaw 970 Preamp, Outlaw 7700 Amp, Velodyne SMS-1, Oppo BDP-83,
2 APC H-15s and a Panamax 5400 for good measure ;)
Stereo: DIY Alix Music Server, DODD Audio Battery Tube Buffer, Modded DAC-60 and MF V-Link (for now), DIY Silver ICs, Battery Powered Class D SDS-254 Amp, and GR-Research N2X Speakers
Post edited by praedet on
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Comments

  • BeefJerky
    BeefJerky Posts: 1,320
    edited March 2012
    You can probably expect around 3.2 ohms resistance since they are 4 ohm impedance drivers. If they're blown, you'll likely have an open circuit (infinite resistance).

    Here's one way you can test for driver versus crossover. Swap the top and bottom mid-woofers and see if the problem follows the driver or stays with the crossover output. The two mid-woofers are the same, so there's no concerns with swapping them.
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  • praedet
    praedet Posts: 314
    edited March 2012
    Cool Thanks!
    HT: Ninja Master LSi9s, Ninja Master LSiC, Slightly Modded LSiFXs, Modded LSi7s, Outlaw LFM-1 EX and Polk PSW125
    Outlaw 970 Preamp, Outlaw 7700 Amp, Velodyne SMS-1, Oppo BDP-83,
    2 APC H-15s and a Panamax 5400 for good measure ;)
    Stereo: DIY Alix Music Server, DODD Audio Battery Tube Buffer, Modded DAC-60 and MF V-Link (for now), DIY Silver ICs, Battery Powered Class D SDS-254 Amp, and GR-Research N2X Speakers
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  • praedet
    praedet Posts: 314
    edited March 2012
    All right, I had to desolder both drivers, but they both measure 4 ohms (which matches the LSi7 driver I measured that is not blown. So, how do I figure out what is gone in the network?

    Ted
    HT: Ninja Master LSi9s, Ninja Master LSiC, Slightly Modded LSiFXs, Modded LSi7s, Outlaw LFM-1 EX and Polk PSW125
    Outlaw 970 Preamp, Outlaw 7700 Amp, Velodyne SMS-1, Oppo BDP-83,
    2 APC H-15s and a Panamax 5400 for good measure ;)
    Stereo: DIY Alix Music Server, DODD Audio Battery Tube Buffer, Modded DAC-60 and MF V-Link (for now), DIY Silver ICs, Battery Powered Class D SDS-254 Amp, and GR-Research N2X Speakers
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  • praedet
    praedet Posts: 314
    edited March 2012
    I will reply to my own thread and say how I figured out that one driver is blown for sure...

    By pushing the driver in and letting it return (lightly) you should not hear anything. If you do, the voice coil has moved and the driver is blown. You can still get the correct resistance but have this issue and you will get distortion...

    This was courtesy of the Sean the skiing ninja
    HT: Ninja Master LSi9s, Ninja Master LSiC, Slightly Modded LSiFXs, Modded LSi7s, Outlaw LFM-1 EX and Polk PSW125
    Outlaw 970 Preamp, Outlaw 7700 Amp, Velodyne SMS-1, Oppo BDP-83,
    2 APC H-15s and a Panamax 5400 for good measure ;)
    Stereo: DIY Alix Music Server, DODD Audio Battery Tube Buffer, Modded DAC-60 and MF V-Link (for now), DIY Silver ICs, Battery Powered Class D SDS-254 Amp, and GR-Research N2X Speakers
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  • Face
    Face Posts: 14,340
    edited March 2012
    You must also push evenly and not on an angle. On an angle, most drivers will scrape regardless.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • Face
    Face Posts: 14,340
    edited March 2012
    Check the 1ohm resistor in the woofer network.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • praedet
    praedet Posts: 314
    edited March 2012
    ^Will do, and sorry that I did not post the even thing, that was part of what I did. Basically, the "Good" drivers make NO sound, and the bad one is very obvious...

    I will also check the 1 ohm resistor. The fun part is trying to get to it as the modified network is HUGE!
    HT: Ninja Master LSi9s, Ninja Master LSiC, Slightly Modded LSiFXs, Modded LSi7s, Outlaw LFM-1 EX and Polk PSW125
    Outlaw 970 Preamp, Outlaw 7700 Amp, Velodyne SMS-1, Oppo BDP-83,
    2 APC H-15s and a Panamax 5400 for good measure ;)
    Stereo: DIY Alix Music Server, DODD Audio Battery Tube Buffer, Modded DAC-60 and MF V-Link (for now), DIY Silver ICs, Battery Powered Class D SDS-254 Amp, and GR-Research N2X Speakers
    · Share on FacebookShare on Twitter