Help Identifying/Possible Problem
kurzawa887
Posts: 5
I was going through my parent's basement and came across a pair of polk audio monitor speakers. From looking around I am unable to identify which model they are. I'm fairly certain they are Monitor 10As, according to the serial number starting with 10A. Is this an incorrect assumption? Can anybody else help by looking at a picture of them? (College internet is being a little unreliable right now picture will be up as soon as it cooperates.)
My next question is after using these for a while they were both in perfect working condition. While listening to music it seems as if the tweeters went out. If that is indeed the case, would the vocals of songs still come out of the mids, or would it just become negated completely. Basically I'm trying to figure out if the tweeters in both were blown at the same time, or if there is some internal crossover that just flipped or something.
Any and all suggestions are greatly appreciated.
-Brian
-edit Picture now up
My next question is after using these for a while they were both in perfect working condition. While listening to music it seems as if the tweeters went out. If that is indeed the case, would the vocals of songs still come out of the mids, or would it just become negated completely. Basically I'm trying to figure out if the tweeters in both were blown at the same time, or if there is some internal crossover that just flipped or something.
Any and all suggestions are greatly appreciated.
-Brian
-edit Picture now up
Post edited by kurzawa887 on
Comments
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Brian,
A pic is helpful, front and back
If they are monitor 10's, they should have a tweeter, 2 6.5" drivers and a 10" passive radiator. Tweeters in these, and many other classic polks, do have a tendency to get blown over the years. Vocals will come out of the mids, but the speaker will sound muffled and dull, notably missing cymbals and the like.
Some monitor 10's have a fuse holder in the back, and we generally suggest you remove the fuse or fuses, check them, and clean off any corrosion on the fuse holder, which can affect the sound. Here is a post that deals with that: http://www.polkaudio.com/forums/showthread.php?t=89439&
Cheers, and welcome to Club Polk The secret for harvesting from existence the greatest fruitfulness and greatest enjoyment is to live dangerously. - Nietzche -
I tried cleaning the fuse contact points, and the sound quality did not return. What are the odds of both of the tweeters being blown at exactly the same time?
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Have you pulled the tweets to see if they are disconnected?Speakers: SDA-1C (most all the goodies)
Preamp: Joule Electra LA-150 MKII SE
Amp: Wright WPA 50-50 EAT KT88s
Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
Cables: Mits S3 IC and Spk cables| PS Audio PCs -
When i took them out, as far as i could see they were connected. Is it possible that the fuses on the back are just blown? When removed, i still get the same sound quality as if they were inserted
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What are the odds of both of the tweeters being blown at exactly the same time?
Excellent, if you drove your AVR/amp into clipping.
Try replacing the fuses and keep the volume level lower in the future.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 -
The receiver that I have puts out max 90 watts per channel. Isn't that split up between the 4 components in one of the speakers? I'm going to replace the fuses and see if this fixes the problem. If you could explain the possible clipping I would like to know more about that.
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Clipping occurs when the amplifier section of your receiver or any amplifier has reached its maximum clean output. On a scope, the sine waves no longer look like a wave form, but become cut off/square, hence the term clipping. This is distortion and tweeters are very sensitive to it. The fuses in your speakers are used to help protect the tweeters from damage.
Generally speaking, anything more than halfway (12 noon) on the volume control will result in bad things happening.Isn't that split up between the 4 components in one of the speakers?
Not exactly....and btw, the big one at the bottom is actually a passive radiator. It is not powered.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 -
I replaced the fuses and it seems to be working like it was before. Thanks for the help and the explanations!
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Make sure you used a 1amp fast blow fuse.
Welcome to Club Polk.
BenPlease. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
kurzawa887 wrote: »When i took them out, as far as i could see they were connected. Is it possible that the fuses on the back are just blown? When removed, i still get the same sound quality as if they were inserted
Put your ear next to the tweeter, you'll know right away if they are working or not. If it's out, put a multimeter (set to 200 ohm range) on the 2 terminals. If it shows no reading it has an open circuit. Seen this quite a few times over the years on the many vintage Polk's I've owned. The 6.5" drivers can quit too. The voice coils become frozen in place. Warped for some reason.HT: Polk SDA SRS 2.3 main fronts, Klipsch RC-25 center channel, Polk RTi-150 rears, M&K V1B sub, Denon AVR-5800, Samsung 52" LCD, Sony BDP-S550
2 Channel: Carver ALS Platinum, Audio Research LS-2B preamp, Counterpoint SA-100 amplifier, Integra CD player, Denon SL7D tt, TC750 phono pre, Nikko tuner -
He already fixed the problem, hello!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
