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Build Thread: SR71-inspired Center Channel

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  • john trials
    replied
    Re: Build Thread: SR71-inspired Center Channel

    With magnets, I've had really good success by drilling a press-fit hole for them in the baffle. Spread a little 5-minute epoxy in the hole and press the magnet in so it is about 0.020 below the baffle face, then fill this 0.020 gap with epoxy (mound the epoxy a little proud of the baffle surface, to be sanded flush after drying). The baffle surface ends up being very flat.

    To keep the magnets oriented properly, keep them in a stack as you insert them into their holes, one at a time. Just mark one end of the magnet stack so you don't put any in backwards.

    When it comes time to mount magnets into the grill (assuming magnets in the grill and baffle), place the grill magnets onto the already-epoxied baffle magnets (this gets the polarity correct with no thought at all). Line the magnet holes on the grill with a little epoxy, and pick up the magnets by pressing the grill onto the baffle. Again, use a press-fit hole in the grills, so the magnets stay in the holes.

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  • davepellegrene
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Originally posted by lunchmoney View Post
    Awwww CRAP

    I epoxied one of the magnets in backwards

    Love these moments. Plan everything out precisely then screw up something simple. I usually bang my head on the work bench a couple times and walk around calling myself a dumb ***.
    Might be able to run a screw in from the back side slowly and pop it out. Maybe score around the edges so it doesn't blow out the MDF.
    Dave

    Leave a comment:


  • Bear5K
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Originally posted by lunchmoney View Post
    Awwww CRAP

    I epoxied one of the magnets in backwards

    Poles being wonderful things, just reverse to corresponding magnet in the grill. If you use metal inserts in the grill, then it doesn't matter unless you are concerned about what the induced magnetic flux in the speaker grill is going to be in about 20 years...

    Leave a comment:


  • lunchmoney
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Awwww CRAP

    I epoxied one of the magnets in backwards

    Leave a comment:


  • millertime
    replied
    Re: Build Thread: SR71-inspired Center Channel

    what a good read.... i really like your milling machine

    Leave a comment:


  • lunchmoney
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Overall, I'm really not too concerned about the magnets coming out perfectly... vinyl laminate will cover them, and this thing will have a grill on it for the foreseeable future anyways.

    So yes, I've decided to just use vinyl laminate, to save time and money (I already have the laminate, and I'm out of black paint).

    The only part of this speaker you'll ever see is the grill, as it will be buried in the AV cabinet.

    Leave a comment:


  • lunchmoney
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Originally posted by greywarden View Post
    I little tip, maybe for your next build, I was shown by a guy that spent waaaaayyyy too much money building one set of speakers a sub and a center.

    Mount the magnets on the backside of the baffle.
    Thought about this, but I want the magnets to be as strong as possible, so I mounted them on the front.

    Leave a comment:


  • mgrabow
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Lunch, as always a nice job. You have always been one of my favorise builders...


    Nice shop...


    I also love those Matrix boards. Here is a trick I use with them. Photocopy the board so you can lay out all your components on the copy and when they all fit just right, trace them out. It will save on messing up the matrix board when you are trying to fit 40 parts onto it...

    Leave a comment:


  • greywarden
    replied
    Re: Build Thread: SR71-inspired Center Channel

    that's a good tip...

    Leave a comment:


  • arlis_1957@yahoo.com
    replied
    Re: Build Thread: SR71-inspired Center Channel

    tip. when i epoxied my magnets in, they raised overnight. the next time, i put a good pinch of mdf dust on them, placed a baffle-sized piece of mdf on top, and clamped. the next day they sanded up just fine.

    looking really nice lunch.

    Leave a comment:


  • greywarden
    replied
    Re: Build Thread: SR71-inspired Center Channel

    I little tip, maybe for your next build, I was shown by a guy that spent waaaaayyyy too much money building one set of speakers a sub and a center.

    Mount the magnets on the backside of the baffle.

    Leave a comment:


  • 50 watt head
    replied
    Re: Build Thread: SR71-inspired Center Channel

    To echo what many have already said: wonderful work! Your build-threads are both informative and inspiring.

    Leave a comment:


  • lunchmoney
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Sanded with a palm sander, first 60 grit then 220 grit...








    Sealed with a 50/50 mixture of wood glue and water... one coat so far, will do a second coat...

    Leave a comment:


  • lunchmoney
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Originally posted by john trials View Post
    Does this project mean you aren't making the SR71 3-ways, or are you still planning on doing those later?
    Yeah, I think that endeavor has been killed.

    There was never a good form solution for them anyways.

    I'll use the RS10's for some other project in the future.

    Leave a comment:


  • john trials
    replied
    Re: Build Thread: SR71-inspired Center Channel

    Originally posted by lunchmoney View Post
    Here's a step I really should have done BEFORE gluing on the baffle... drilling the holes for the grill magnets with a forstener bit. This was a pain.
    I've done this a few times with a spade bit and a hand drill (just prior to veneer), and it's not a problem. The holes don't have to be perfect, because they are filled with epoxy when the magnet is inserted, then sanded flush.

    Cool build thread...I always enjoy them.

    Does this project mean you aren't making the SR71 3-ways, or are you still planning on doing those later?

    Leave a comment:

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