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First Build....C-Notes

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  • rmog2133
    replied
    Finished one today! Painted bottom and back and used the Vvivid xpo mahogany wood grain vinyl for sides, front and top. I really like how it came out. Ran out of vinyl, ordered some today so be able to finish the other one next week when I'm off. Thanks again for all the help! Can't wait to hear these together! Sent from my SM-G955U using Tapatalk

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  • rmog2133
    replied
    Thanks for the tips guys. I clamped on a pair of wire cutters (grippy plier end) as a heat sink when soldering everything up. Tested this morning and it works! Had a minor freakout as I used a new (to me) Denon stereo receiver and didn't realize the "b" speakers were selected and thought I really FUBAR'd it this time. One push of a button and success!
    Painted the back and bottom of the cabinets so tomorrow will do the vinyl wrap and final assembly. Sent from my SM-G955U using Tapatalk

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  • jonbourg
    replied
    Originally posted by kevintomb View Post
    Careful with the heat when soldering to resistors (or any component) resistors can "burn out" it hit with a lot of heat for any extended amount of time.
    You can prevent that by clipping an alligator clip or something similar past the soldering point as a heat sink.

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  • kevintomb
    replied
    Careful with the heat when soldering to resistors (or any component) resistors can "burn out" it hit with a lot of heat for any extended amount of time.

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  • rmog2133
    replied
    Just finished reassembly on the crossover, testing tomorrow. (Fingers crossed!) All goes well, on to paint and wrap then final assembly! Sent from my SM-G955U using Tapatalk

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  • Kornbread
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  • jonbourg
    replied
    Alright!!!

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  • rmog2133
    replied
    So I finally found time today to disassemble the bad crossover and test components....bad resistor! Here are two pics, one of the reading for the resistor on the good crossover and the bad one. Thank you all for the input and direction, much appreciated. Called Parts-express and have a replacement on the way. Can't wait to finish this up and hear these speakers!

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  • wogg
    replied
    Do you have a multimeter to check for continuity / resistance?

    Make sure that 6 ohm resistor measures about 6 ohms anywhere on the leads, closer to the cap / coil the better. 
    Make sure there is good continuity from the - input to the - on the tweeter.
    Make sure the resistance across the tweeter is about 3 ohms (not shorted out).
    Make sure the leads are intact on the capacitors and there are no sneaky breaks in the wires from bending.
    The capacitors should all measure open with a DMM, with a low resistance at first that quickly rises and goes out of range.
     

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  • rmog2133
    replied
    Used some flux core solder on the joints, ended up doing what bnb you had said shortly after posting these pics, letting it flow into the wires better and still nothing from the tweeter connection. Using jump wires, the only place the tweeter gets sound from is the + input....any other joint it receives nothing. So I'm thinking bad component? Used new jump wire to bypass poor solder joint and still nothing, and the woofer gets all the sound! I'm about to just order new components and start over..... Sent from my SM-G955U using Tapatalk

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  • jonbourg
    replied
    On your failing crossover it looks like the bottom solder joint is a really bad cold solder joint. Did you use flux? Clean it with alcohol, put some flux on it. Let your solder iron heat up real good. It should immediately melt the solder. Also crappy quality solder looks dull and grayish after soldering good solder looks shiny.

    Ok, place the iron with a little bit of solder on one side of the joint and when it heats up put solder on the joint from the other side. The solder should basically automatically flow into the wiring and viola!!! When your done clean it with alcohol let it dry and try it out!!

    It doesn't have to be pretty but as long as its hooked up correctly and the solder joints are good it should work. On your bottom working crossover the joint all the way on the right where you can still see the wires and the solder is fully enclosing them is what it should look like.

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  • rmog2133
    replied
    Originally posted by Brian B View Post
    What you did above isn't clear to me. I would take the "suspect " tweeter and connect it to the crossover that works. That will show whether the tweeter is good or bad. If the tweeter is good, I'd reconnect it to the "bad" crossover. Connect the tweeter - to the normal junction point. Then connect the tweeter + to the resistor-capacitor junction. You should hear sound from the tweeter. Then move the tweeter + connection to the junction of the two caps and inductor. You should get sound from the tweeter there as well.
    Tweeter is good, tested it straight off the amp and setup untested tweeter to "bad" crossover. Same results on "bad" crossover with new tweeter, verified it works by hooking to "good" crossover.
    What I meant by jumping it was took the woofer + lead to the tweeter and got high end response.
    Working today with meeting after work, so hopefully late tonight I can give the test you suggest a go.
    I greatly appreciate the input and patience demonstrated dealing with my issue and relative ignorance. Thank you all! Sent from my SM-G955U using Tapatalk

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  • Chris Roemer
    replied
    Did you swap tweeter (between boxes/XOs)?

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  • Brian B
    replied
    Originally posted by rmog2133 View Post
    Jumped woofer + to tweeter and responds all the way through the frequency band, but nothing on tweeter side. I'm not sure where I went wrong here since one works and the other doesn't...perhaps a faulty component? Sent from my SM-G955U using Tapatalk
    What you did above isn't clear to me.

    I would take the "suspect " tweeter and connect it to the crossover that works. That will show whether the tweeter is good or bad.

    If the tweeter is good, I'd reconnect it to the "bad" crossover. Connect the tweeter - to the normal junction point. Then connect the tweeter + to the resistor-capacitor junction. You should hear sound from the tweeter. Then move the tweeter + connection to the junction of the two caps and inductor. You should get sound from the tweeter there as well.

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  • rmog2133
    replied
    Jumped woofer + to tweeter and responds all the way through the frequency band, but nothing on tweeter side. I'm not sure where I went wrong here since one works and the other doesn't...perhaps a faulty component? Sent from my SM-G955U using Tapatalk

    Leave a comment:

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