Just fried the tweeters on my Rti a7

polk500
polk500 Posts: 1,171
edited August 2012 in Speakers
Well I was playing these to hard on a Friday afternoon two hours of moderate to loud; everything was sounding fine and just like that they stop working I went over to check by putting my ear next to then and I could smell something wasn't right as well as not hear anything.

Now I must say I was a little surprised the amp is a parasound 1500a and the Polk guy said what happen was the amp ran out of juice and clipped the tweeters.

Oh well lesson learned
Cheers Roger
Post edited by polk500 on
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  • mdaudioguy
    mdaudioguy Posts: 5,165
    edited June 2012
    Sorry to hear that... so what were you driving them with??
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  • VR3
    VR3 Posts: 28,781
    edited June 2012
    could be resistors
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 50,748
    edited June 2012
    polk500 wrote: »
    Now I must say I was a little surprised the amp is a parasound 1500a and the Polk guy said what happen was the amp ran out of juice and clipped the tweeters.

    Oh well lesson learned

    There are a few amps that basically never clip, yours isn't even close to being one of them. Like you said, lesson learned.
    could be resistors

    Excellent suggestion. polk500, remove the binding post cup to check the crossover board for burnt resistors. You shouldn't have any problem spotting them.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • SRTer
    SRTer Posts: 372
    edited June 2012
    polk500 wrote: »
    Well I was playing these to hard on a Friday afternoon two hours of moderate to loud; everything was sounding fine and just like that they stop working I went over to check by putting my ear next to then and I could smell something wasn't right as well as not hear anything.

    Now I must say I was a little surprised the amp is a parasound 1500a and the Polk guy said what happen was the amp ran out of juice and clipped the tweeters.

    Oh well lesson learned
    Cheers Roger

    I will tell you this, I'm ready to move up to a higher powered amp. I also have a 200watt amp on my RTi A9's and I think that a little more power will help safe guard my setup from clipping.

    I already ordered a new tweeter just in case one burns up.
    Fronts: Polk RTi A9
    Center: Polk CSI A6
    Rears: Polk RTi A7
    Receiver: Pioneer Elite SC-35 (140 watts x 7)
    Amplifier: Adcom GFA-555 Mk.II (200 watt @ 8 ohms)
    Sub: Polk DSW PRO 500 (10 inch, 200 Watt)
    TV: Samsung 59 inch 3D Plasma 600 Hz PN59D7000
    Sources: Samsung BD-D6700 3D Blu-ray Player, DirecTV, PS3, iPhone 4 and IPod Classic with Apple Lossless Tracks
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  • polk500
    polk500 Posts: 1,171
    edited June 2012
    I was useing my Parasound hca 1500a in two channel and source Squeese Box, HK 3600.

    Thanks I will check the resisters on Tuesday, Just pop in Town from camping it's Canada Day long weekend.

    Maybe one of these days I will have to buy one of those amps F1.

    Cheers Roger
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  • lanchile
    lanchile Posts: 560
    edited June 2012
    polk500 wrote: »
    I was useing my Parasound hca 1500a in two channel and source Squeese Box, HK 3600.

    Thanks I will check the resisters on Tuesday, Just pop in Town from camping it's Canada Day long weekend.

    Maybe one of these days I will have to buy one of those amps F1.

    Cheers Roger

    Easy and fast to check!!!.Just take tweeter out (disconnect it from crossover) and measure it in ohms, it should read some ohms, I am not sure if they are 4-8 ohms but it should be around that.
    Make it simple...Make it better!
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  • eltrooper44
    eltrooper44 Posts: 2
    edited July 2012
    when a amp can't produce any more current it "the amp" starts screaming , in other words clipping, i'll give you a better example lets say you pick-up weights and you do regular let's say 125lbs but you start doing 200lbs the pressure is more than what you can handle!! speakers have a RMS Watts never look at the lower value example my rt-800i are rated 20-250 watts rms.

    I have clipped my polk audio RT-800i about two times and i have Pioneer Elite vsx-47tx thx ultra 2..it rate at 130 rms x 7 channels and it weights 62lbs...

    if the consumer would match the amp to speaker properly, about 100 or 200 watts more over the
    higher rated RMS wattage spec. you'll benefit a stronger & better sounding system....

    I'am trying to get a carver amp with a rms of 300 to 375 watts per channel, these amps have lots of headroom...

    in order to properly drive the speaker you'll need over power speaker so wont stress or clipped the amplifier...
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  • jbooker82
    jbooker82 Posts: 1,627
    edited July 2012
    eltrooper44 wrote: »
    I'am trying to get a carver amp with a rms of 300 to 375 watts per channel, these amps have lots of headroom.

    I have a 250 x 3 Carver A-753x. The meters show about 80-120 watts to maintain music at 107 db (according to my Radio Shack meter). The needles dont ever max out.
    AVR: Onkyo Tx-NR808
    Amplifier: Carver A-753x 250 watts x 3
    Fronts: Polk RTI A7 (modded by Trey VR3)
    Center: CSI A4 (modded by Trey VR3)
    Rear: FXI A4
    Sub: Polk DSW Pro 660wi
    TV: LG Infinia 50PX950 3D
    Speaker Cable: AudioQuest Type 8
    IC: AudioQuest Black Mamba II
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  • vadang
    vadang Posts: 101
    edited July 2012
    If it turns out it was your crossover, drop me a note. I have an extra RTiA7 crossover I can send you for cheaper than a new one.
    Living Room:
    Paradigm Cinema 330 x 3, Pioneer 9040TXH

    Media Room:
    RTi12, CSi5, F/Xi3, RTi4, Onkyo SR805, SVS PB12 Plus/2, HSU MBM
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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    Good day,
    Polk is sending me a couple of tweeters with the statement this time they pay next time I pay; funny but fair.

    Hopefully that?s what blew as I checked the resistors and they looked fine.

    As for the Amp well of course I would like the top of the line best of the best (Maybe one of these days) but I have the Parasound and it seems to be highly recommended on this forum and it is a sweet sounding amp.

    And I was the one that was pushing the Parasound harder then I should have; In fact it probably a good thing as my ears were ringing and we all know that a bad sign for one?s hearing but I wanted to really hear what it could do and now i know.

    Cheers Roger
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  • cr136124
    cr136124 Posts: 186
    edited July 2012
    Well, you gotta love Polk's customer service for what they did for you. And, I am glad were the tweeters the ones that fried and not your ears. Yep, you can replace tweeters......but your ears........not so sure...;o)
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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    I just wanted to comment that Parasound has plenty of current and to most are considered an upgrade over Carver solid state amplifiers...
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    Hmmm Mods did you guys delete a reply in this tread or am I losing it. I’m sure someone had said get rid of the Parasound and get a Carver.

    Cheers Roger
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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    Yep it has been deleted...

    They be stealthy!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    It was kind of bashing brands I suppose.

    Cheers Roger
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  • F1nut
    F1nut Posts: 50,748
    edited July 2012
    polk500 wrote: »
    Hmmm Mods did you guys delete a reply in this tread or am I losing it. I’m sure someone had said get rid of the Parasound and get a Carver.

    Cheers Roger

    Yeah, not really sure why that post was deleted.

    That person stated that some unnamed model Carver amp was higher current than your Parasound. So, let's look at that. Your Parasound is rated at 205wpc with 60 amperes peak to peak. Finding amperes specs for Carver gear is not easy and all I could find was for one of the Sunfire pieces. The Series II 625x2 is rated at 625 wpc with 100 amperes peak to peak. Then we have the Musical Fidelity AMS100 at 100 wpc with 200 amperes peak to peak. Draw your own conclusions.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    Then we have the Musical Fidelity AMS100 at 100 wpc with 200 amperes peak to peak. Draw your own conclusions.

    Well my Conclusions is I want it :-)

    And I suspect this amp won’t run out of juice.
    Cheers Roger
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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    Odyssey Audio - enough amperage to arch weld!
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • F1nut
    F1nut Posts: 50,748
    edited July 2012
    I'm seeing 120 amperes for their mono blocks, am I missing something?
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    For what you can buy their Mono blocks for used I would say that's pretty darn good ;)
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • PolkieMan
    PolkieMan Posts: 2,446
    edited July 2012
    I had a old Pioneer Sx-1050 that kept blowing the left speaker.
    At first I thought it was just a bad speaker but after 2 times
    I realized the thing was spiking or shorting out.
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
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  • transmaster
    transmaster Posts: 428
    edited July 2012
    cr136124 wrote: »
    Well, you gotta love Polk's customer service for what they did for you. And, I am glad were the tweeters the ones that fried and not your ears. Yep, you can replace tweeters......but your ears........not so sure...;o)

    Yes your ears, take it from and old musician take care if your ears. I wish I still had the ears I had when I listened and felt impacting in my lungs Joe Walsh nuking another set of Peavey speakers with his bass guitar.
    Radio Station W7ITC
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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    So hooked up the new tweeters and nothing. Tried then on the upstairs rig to make sure it wasn't the avr and still nothing.

    Any suggestions before I exchange then.

    Thanks Roger
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  • Tony M
    Tony M Posts: 11,186
    edited July 2012
    woa, this is a tough one.....2? bad new tweeters...

    POLK cus. serv.?, what to do, what to do....
    Most people just listen to music and watch movies. I EXPERIENCE them.
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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    Your problem is your resistors in your crossovers.. plain and simple
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • polk500
    polk500 Posts: 1,171
    edited July 2012
    Well I looked and they seem find but that doesn't mean much as I don't know what a good ones looks like anyway. I guess I good google it.

    I will call Polk in the morning and see what they say.

    So is changing out the resistors a big deal?

    Thanks Roger
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  • F1nut
    F1nut Posts: 50,748
    edited July 2012
    Your problem is your resistors in your crossovers.. plain and simple

    This.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • F1nut
    F1nut Posts: 50,748
    edited July 2012
    You need a VOM to test the resistors. A cheap one will work.

    Edit: You might as well keep the tweeters, never know when you might need a set down the road.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • VR3
    VR3 Posts: 28,781
    edited July 2012
    You pay for parts and return shipping and I will fix your crossovers for free.

    Turn it down next time... lol
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • PolkieMan
    PolkieMan Posts: 2,446
    edited July 2012
    They are not hard to replace but you going to have to call Polk to find out what they are anyway so you might as well ask them what they recommend to do.
    POLK SDA 2.3 TLS BOUGHT NEW IN 1990, Gimpod/Sonic Caps/Mills RDO-198
    POLK CSI-A6 POLK MONITOR 70'S ONKYO TX NR-808 SONY CDP-333ES
    PIONEER PL-510A SONY BDP S5100
    POLK SDA 1C BOUGHT USED 2011,Gimpod/Sonic Caps/Mills RDO-194
    ONKYO HT RC-360 SONY BDP S590 TECHNICS SL BD-1
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