RTA-11t problem

derwood
derwood Posts: 29
in Vintage Speakers
I just bought a pair of RTA-11t's recently. I'm currently driving them with a Adcom gfa-2 until my refurbished carver 1.0 comes in. When I turn up the volume the speaker protection relay trips before the amp clips. After further testing I have narrowed it down to one of the speakers causing the problem. The speaker sounds good. What would be the most likely reason for this? Would it be the crossover or a bad driver?
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  • boston1450
    boston1450 Posts: 7,637
    I would swap that woofer with the other cabinets woofer & see if it follows. That way you know if its the xover. Make sure the wires are wired up properly. If its the woofer-replace it
    ..
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  • boston1450
    boston1450 Posts: 7,637
    Oh. One more thing. Make sure you have the correct drivers in those cabinets. Welcome to the Polk Forum
    ..
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  • 11tsteve
    11tsteve Posts: 1,166
    The RTA 11T has a polyswitch in the crossover to protect the tweeters. You say it is kicking in, so you are saying the tweeters are shutting down?
    Those polys go bad over time.... they did in my 11T to the point I could barely get the volume knob past 9 0'clock. It can be removed from the crossover and replaced either with a jumper or a 0.5 ohm Mills resistor.
    Polk Lsi9
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  • derwood
    derwood Posts: 29
    edited April 2016
    No, the amp's speaker protection relay is tripping. Im sure its the one speaker causing the problem. Im going to try swapping the woofers tonight like boston 1450 suggested. Thanks!
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  • 11tsteve
    11tsteve Posts: 1,166
    sorry... I read that wrong.
    Polk Lsi9
    N.E.W. A-20 class A 20W
    NAD 1020 completely refurbished
    Keces DA-131 mk.II
    Analysis Plus Copper Oval, Douglass, Morrow SUB3, Huffman Digital
    Paradigm DSP-3100 v.2
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  • codycatalist
    codycatalist Posts: 2,662
    Yes check and make sure the correct drivers are in there. Could be too low of an ohm load. I know the 11ts are 6 ohm speakers but if maybe a 4 ohm driver got stuck in there as a quick replacement the load can drop quickly.

    Just my $.02s
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
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  • codycatalist
    codycatalist Posts: 2,662
    From what I read online about this amp. "This amp is designed to go no lower than 2 ohm loads but will handle 4 ohm loads."

    Grab the drivers numbers (obviously besides the passives) and throw them up on here someone will know the nominal impedance.
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • boston1450
    boston1450 Posts: 7,637
    I would make sure its the correct driver too. I have bought vintage speakers & found out they threw whatever MWxxxx that fit in the spot & called it a day. They may look the same BUT can be very different. Get some 1 tube of LocTite Power Grab (3.00 a tube at WallyMart) glue each side of the magnets in all your MW woofers to prevent 'shift in magnets'..... Also, In this Vintage Section there is a STICKY at top of the threads that can be a big help on info-on your speakers
    ..
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  • codycatalist
    codycatalist Posts: 2,662
    I just rebuilt some 11TLs, not quite the same but I am more than happy to give advice if you ever want to shoot me a PM.
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • derwood
    derwood Posts: 29
    I did the driver swap one at a time and it made no difference. I also swapped the tweeters. the drivers are the original 6510's made in 1990.
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  • codycatalist
    codycatalist Posts: 2,662
    There is only so much that can cause this problem from the speaker's end. Have you checked inside the adcom to make sure there are no fried components?
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • derwood
    derwood Posts: 29
    yes. I have ran the other speaker on both channels and it does not happen.
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  • boston1450
    boston1450 Posts: 7,637
    edited April 2016
    oppps i see ^**
    ..
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  • derwood
    derwood Posts: 29
    boston1450, I did that. im going to swap the speaker wires just to be sure
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  • derwood
    derwood Posts: 29
    I swapped the speaker wires and it still does the same thing. Could a bad capacitor cause this or maybe one of the two chokes has a short?
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  • codycatalist
    codycatalist Posts: 2,662
    I couldn't imagine the cap changing the impedance which is the only reason I would see it going into protection. @westmassguy does your vast knowledge library have anything to add?
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • derwood
    derwood Posts: 29
    supposedly the gfa-2 protection trips when dc voltage is detected. Would a short cause it to trip also?
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  • codycatalist
    codycatalist Posts: 2,662
    edited April 2016
    I'm nuff of a man to admit I'm not sure on that one but in case it does have you double checked all the internal wiring and speaker terminals to make sure nothing is exposed or touching metal?
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • westmassguy
    westmassguy Posts: 6,850
    I'd have the Adcom checked. The 11ts are similar to the 10s, same crossover and driver compliment. They're rated 6 ohm, but are probably closer to 4. The Adcom should handle that up to a point, but it's only 100 watts @ 8 ohms. I couldn't find any actual ratings for it.
    If you have a meter, I'd be interested in what DCR you read at the speaker binding posts.
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  • derwood
    derwood Posts: 29
    If the problem was low impedance, I would think it would be a heat issue tripping the protection relay. This will happen even when the amp is cold. I can still crank it up fairly loud but if I go just a little too much it trips. I have tested the speakers individually on both channels and it definitely the speaker causing it. Is there anywhere I can buy new or rebuilt crossovers or can someone direct me to the right place to get good replacement parts for a rebuild? Thanks.
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  • derwood
    derwood Posts: 29
    is this the correct crossover?
    http://www.ebay.com/itm/POLK-AUDIO-SERIES-10-CROSSOVER-/121710525868
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  • Nightfall
    Nightfall Posts: 10,086
    How loud on the volume dial if the dial is a clock?
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
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  • derwood
    derwood Posts: 29
    2 o'clock. using a carver c2 preamp and a denon DP-47 turntable. The good speaker can be turned up until the amp clips and it never trips. That is on either channel. The bad speaker trips the relay well before the amp clips no matter which channel it is hooked to.
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  • codycatalist
    codycatalist Posts: 2,662
    derwood wrote: »
    If the problem was low impedance, I would think it would be a heat issue tripping the protection relay. This will happen even when the amp is cold. I can still crank it up fairly loud but if I go just a little too much it trips. I have tested the speakers individually on both channels and it definitely the speaker causing it. Is there anywhere I can buy new or rebuilt crossovers or can someone direct me to the right place to get good replacement parts for a rebuild? Thanks.


    I would think about sending them to West mass guy and doing the TL upgrade. Get some RDO198 tweets and she'll be singing in no time.
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • derwood
    derwood Posts: 29
    yeah, I already have the tweets on the way. Thanks
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  • codycatalist
    codycatalist Posts: 2,662
    Which ones did you buy?
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • Nightfall
    Nightfall Posts: 10,086
    edited April 2016
    derwood wrote: »
    2 o'clock.

    Regardless of the issue at hand that is way too loud. You're going to damage something sooner rather than later. I hope you get it figured out, good luck!
    Post edited by Nightfall on
    afterburnt wrote: »
    They didn't speak a word of English, they were from South Carolina.

    Village Idiot of Club Polk
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  • codycatalist
    codycatalist Posts: 2,662
    ^^^
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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  • F1nut
    F1nut Posts: 50,550
    At 2 o'clock it is clipping.
    Political Correctness'.........defined

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  • codycatalist
    codycatalist Posts: 2,662
    So is it safe to say I can turn it up to 11....o clock :p
    Just a dude doing dude-ly things

    "Temptation is the manifestation of desire which equals necessity." - Mikey081057
    " I have always had a champange taste with a beer budget" - Rick88
    "Just because the thread is getting views don't mean much .. I like a good train wreck doesn't mean i want to be in one..." - pitdogg2
    "Those that don't know, don't know that they don't know." - heiney9
    "Audiophiles are the male equivalent of cat ladies." - Audiokarma Member
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