Dead tweeters on one month old R700's

This is likely an easy answer for many, but at the risk of embarrassment, I will tell you what I have done. I have been enjoying my new r700 immensely but at lower volumes. A few days ago I had the house to myself and thought I would see what these speakers could do at close to reference levels. Bi-amped with an Anthem receiver and an Emotiva XPA amp, I may have cooked the tweeters. This would be a first for me but I would venture to guess that this is what has happened as there is no sound coming from either tweeter but both the mid and bass drivers are fine. Does anyone care to weigh in?
I have contacted Polk and they are graciously sending replacements as they are new.
I will admit to playing very clean source material with no distortion at a pretty high volume but nothing crazy, could this be a manufacturer defect?
Cheers,
Jmore64
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Answers

  • Clipdat
    Clipdat Posts: 12,472
    How are you bi-amping?
  • jmore64
    jmore64 Posts: 11
    Hello, I'm using the Emotiva to drive the bass drivers and using the Anthems front main out to drive mid and tweeter
  • Clipdat
    Clipdat Posts: 12,472
    I would suggest abandoning the bi-amping thing and just hooking them up to one amplifier with the stock jumpers in place to see what happens.
  • VR3
    VR3 Posts: 27,880
    I would check the crossovers first for burnt resistors
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
  • jmore64
    jmore64 Posts: 11
    I have gone back to the simple one amp set up as you said. I will say that there was quite a noticeable improvement in the overall sound stage and liveliness when they were bi-amped. At the risk of damaging another set of tweeters, I will stay with the one amp set up. Thanks for your feedback. Cheers
  • jmore64
    jmore64 Posts: 11
    q7zv726c68iy.jpg
    Took a picture of the tweeter. It is looking rather distorted :neutral:
  • BlueFox
    BlueFox Posts: 15,251
    You will still damage the speakers with one amp if it is played too loud.
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  • Clipdat
    Clipdat Posts: 12,472
    Looks like someone poked it with their fingers.
  • Clipdat
    Clipdat Posts: 12,472
    jmore64 wrote: »
    I have gone back to the simple one amp set up as you said. I will say that there was quite a noticeable improvement in the overall sound stage and liveliness when they were bi-amped. At the risk of damaging another set of tweeters, I will stay with the one amp set up. Thanks for your feedback. Cheers

    And does the tweeter make sound now?
  • jmore64
    jmore64 Posts: 11
    Well if nothing else, I've certainly learned a lesson on the limitations of my gear.
  • jmore64
    jmore64 Posts: 11
    No kids in the house and the wife doesn't go near my stuff but that's what it looks like and the other one looks similar. I think they just overheated. Apparently, after talking to a tech at Polk, there has been a run of bad tweeters.
  • Clipdat
    Clipdat Posts: 12,472
    BlueFox wrote: »
    You will still damage the speakers with one amp if it is played too loud.

    How do you know this?
  • Clipdat
    Clipdat Posts: 12,472
    jmore64 wrote: »
    No kids in the house and the wife doesn't go near my stuff but that's what it looks like and the other one looks similar. I think they just overheated. Apparently, after talking to a tech at Polk, there has been a run of bad tweeters.

    How loud were you listening?
  • jmore64
    jmore64 Posts: 11
    I will look forward to receiving the replacement tweeters and getting my r700's running again, it's a fine speaker.
  • jmore64
    jmore64 Posts: 11
    Signing off for now, thanks for all of the input.
  • Clipdat
    Clipdat Posts: 12,472
  • mhardy6647
    mhardy6647 Posts: 32,768
    jmore64 wrote: »
    ... I think they just overheated. Apparently, after talking to a tech at Polk, there has been a run of bad tweeters.

    oh, my. :(
  • Clipdat
    Clipdat Posts: 12,472
    A likely story!
  • ken brydson
    ken brydson Posts: 8,632
    Toolfan66 wrote: »
    Maybe I’m the minority here, but I have never blown a tweeter, not even before I fell into this hobby..

    Me neither...
  • mhardy6647
    mhardy6647 Posts: 32,768
    edited May 2022
    I took our an Electrovoice LS-12 twincone 12" fullrange with my Yamaha CA-610II one day, a long, long time ago. :/

    EDIT: I also used to pop the 1 A tweeter fuses on my Polk 7As more than occasionally when Daltry screamed at the climax of Won't Get Fooled Again. You know -- back in my yoot'. :#
    That probably had as much to do with IGD as it did with amplifier output power, though. :o
  • treitz3
    treitz3 Posts: 18,126
    Toolfan66 wrote: »
    Maybe I’m the minority here, but I have never blown a tweeter, not even before I fell into this hobby..

    Rookie.

    Tom
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
  • smglbrth
    smglbrth Posts: 1,456
    I've never blown a tweet but used to trip mine often in my younger days (vintage Polks). It would always happen on Dokkens song Walk Away. Lynch's solo always did it...
    Remember, when you're running from something, you're running to something...-me
  • rooftop59
    rooftop59 Posts: 7,928
    Makes sense if it’s a bad batch of tweeters. Even though the bi-amping is a bit redneck and not sure how you keep the volume the same on both, it’s plenty of power and shouldn’t blow those tweets unless you are at seriously ear bleeding levels imho…
    Living Room 2.2: Usher BE-718 "tiny dancers"; Dual DIY Dayton audio RSS210HF-4 Subs with Dayton SPA-250 amps; Arcam SA30; Musical Fidelity A308; Sony UBP-x1000es; Squeezebox Touch with Bolder Power Supply
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  • F1nut
    F1nut Posts: 49,602
    edited June 2022
    rooftop59 wrote: »
    Makes sense if it’s a bad batch of tweeters. Even though the bi-amping is a bit redneck and not sure how you keep the volume the same on both, it’s plenty of power and shouldn’t blow those tweets unless you are at seriously ear bleeding levels imho…

    Yep, there's no way he had the AVR and power amp gain levels matched.
    Political Correctness'.........defined

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  • audioluvr
    audioluvr Posts: 5,391
    I cooked a couple of RDO-194's cranking Joe Walsh once. They kept playing but with a horrible buzzing sound. Luckily I keep spares.
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  • I have the same issue. Blown tweeter. Just contacted customer service for direction on replacing. Nothing was mentioned here about how to replace the tweeter. There are no screws on the front to remove like the old days. How are the drivers mounted into the cabinet? Are they friction fit or glued in? I would like to know so when I get the replacement, I'll be all set.
    Thanks
  • Hello, it's pretty simple. If I remember correctly, the black ring that surrounds the tweeter is held in with three magnets. If you can find yourself a thin piece of metal ie. Exacto blade or similar, (I used a flat electronic connector) fit it in between the outside edge of the plastic ring and cabinet, and carefully lift out the ring. This will expose the mounting screws. Undo these screws (4) the tweeter can now be pulled out. Be careful not to let the wires slip back into the speaker when you disconnect. Best of luck, and enjoy your speakers they are great sounding, and getting better all the time.
  • That worked. Thank you. Just have to wait for the tweeter now. :/
  • I agree that the speakers sound great. I had a pair of Polk SDA-SRS 2.3 back in the late 80's. Loved those speakers! BIG Sound! But I also got a pair of old JBL L100's from my dad just recently. I fixed them up with new grills and tweeter foam rings and they sound awesome. Totally different sound from the R700's. I get to direct compare them and to tell you the truth, right now I really like the JBL's better. The richness of the mid-range and bass has more tonal quality and fullness. Maybe after I get the tweeter fixed, I'll give the Polks another hard listen and see where we are then.
    Thanks again.