Danny Richie tests LSIM703

marvda1
marvda1 Posts: 4,901
in Speakers
https://www.youtube.com/watch?v=dPzupmAfSpg&t=988s
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Puritan PSM156
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Comments

  • VR3
    VR3 Posts: 28,611
    I like how the video stops and he comes back in to talk about how difficult this install would be. The part where he says you could put those parts all over the enclosure internally is awful and should be removed from the video.

    External is the only option for the 703 for a full rebuild
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • xschop
    xschop Posts: 5,000
    What is the Freq. cutoff of the woofer? Just curious.
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,413
    xschop wrote: »
    What is the Freq. cutoff of the woofer? Just curious.

    Did you watch the video? He has graphs of the testing.
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  • Gardenstater
    Gardenstater Posts: 4,458
    I'll have to watch again. I thought he did say that an external mount with the crossover inside a stand is the way to go and that the components would actually take up too much internal enclosure volume compared to the original 2 board crossovers.
    George / NJ

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  • pitdogg2
    pitdogg2 Posts: 25,413
    edited November 2023
    Gardenstater wrote: »
    I'll have to watch again. I thought he did say that an external mount with the crossover inside a stand is the way to go and that the components would actually take up too much internal enclosure volume compared to the original 2 board crossovers.

    He did say that, he also did say you "could" BUT you would need to fiddle around with placement around all the bracing. He definetly alluded to the impossibility of doing it that way.
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  • xschop
    xschop Posts: 5,000
    pitdogg2 wrote: »
    xschop wrote: »
    What is the Freq. cutoff of the woofer? Just curious.

    Did you watch the video? He has graphs of the testing.

    TY....@330 Hz . If I find a set, the mids would get plugged and the plastic frame swapped for solid alloy.
    Don't take experimental gene therapies from known eugenicists.
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  • VR3
    VR3 Posts: 28,611
    The problem with the Lsim series at this point is the fact the tweeters are very unreliable and Polk doesn't have replacements
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • mantis
    mantis Posts: 17,190
    VR3 wrote: »
    The problem with the Lsim series at this point is the fact the tweeters are very unreliable and Polk doesn't have replacements

    I'm surprised by that. The LSIM's was one of their very best lines.
    Dan
    My personal quest is to save to world of bad audio, one thread at a time.
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  • VR3
    VR3 Posts: 28,611
    The days of long term legacy support seen to be over im afraid
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • xschop
    xschop Posts: 5,000
    Dayton tweeter to the rescue.
    Don't take experimental gene therapies from known eugenicists.
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  • Toolfan66
    Toolfan66 Posts: 17,221
    edited November 2023
    VR3 wrote: »
    The days of long term legacy support seen to be over im afraid

    I don't think any of us expect anything like they have done with the vintage SDA's and even that has dwindled over the last 10 years, but with lines like the LSiM, and Legend, and maybe even the Reserve, they should be able to have parts for at least 3 years after the death of the line, especially to the people that have the paper work that they are the original owners.

    My LSiM's have worked flawlessly since I purchased them, so even the three years really wouldn't have mattered for me.

    I do have a brand new set of 703's put away...
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  • Emlyn
    Emlyn Posts: 4,477
    edited November 2023
    VR3 wrote: »
    The problem with the Lsim series at this point is the fact the tweeters are very unreliable and Polk doesn't have replacements

    I have had several pairs of these without any driver failures. But, I did notice that after driving a pair of LSiM703s at moderately high volume for an hour continuously with a Parasound A21 amp that the tweeter bezel was a bit warm to the touch. That seemed unusual to me so I turned the volume down to see if the issue would go away. It did.

    Of course the failures may have been caused a bad batch in production or the speakers may have been driven by inadequate current at some point in their lives. It could also have been a design issue with inadequate heat dissipation, but that's just a guess.

    As I recall when replacements were available they were relatively expensive. It's been decades since I blew a tweeter on a speaker but I remember when I did it was because of the speakers being overdriven with inadequate power causing too much heat for the tweeter to handle.
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  • Emlyn
    Emlyn Posts: 4,477
    How does someone determine the point at which taking up more cabinet volume with larger crossover parts will have an effect on speaker performance? Is there a way to counteract the volume loss somehow with less internal insulation material? Or does it matter at all if the speaker is ported or not ported?
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  • F1nut
    F1nut Posts: 50,500
    My logic says more than a 10% loss of internal volume will affect the performance.
    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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  • invalid
    invalid Posts: 1,363
    edited November 2023
    Emlyn wrote: »
    VR3 wrote: »
    The problem with the Lsim series at this point is the fact the tweeters are very unreliable and Polk doesn't have replacements

    I have had several pairs of these without any driver failures. But, I did notice that after driving a pair of LSiM703s at moderately high volume for an hour continuously with a Parasound A21 amp that the tweeter bezel was a bit warm to the touch. That seemed unusual to me so I turned the volume down to see if the issue would go away. It did.

    Of course the failures may have been caused a bad batch in production or the speakers may have been driven by inadequate current at some point in their lives. It could also have been a design issue with inadequate heat dissipation, but that's just a guess.

    As I recall when replacements were available they were relatively expensive. It's been decades since I blew a tweeter on a speaker but I remember when I did it was because of the speakers being overdriven with inadequate power causing too much heat for the tweeter to handle.


    The amp may have been clipping on the transient peaks, most amps do not have an overbuilt regulated power supply including the parasound a21. Try an amp the can double down to 1ohm, I guarantee that would not happen.
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  • MLK
    MLK Posts: 17
    edited November 2023
    Toolfan66 wrote: »
    VR3 wrote: »
    The days of long term legacy support seen to be over im afraid

    I don't think any of us expect anything like they have done with the vintage SDA's and even that has dwindled over the last 10 years, but with lines like the LSiM, and Legend, and maybe even the Reserve, they should be able to have parts for at least 3 years after the death of the line, especially to the people that have the paper work that they are the original owners.

    My LSiM's have worked flawlessly since I purchased them, so even the three years really wouldn't have mattered for me.

    I do have a brand new set of 703's put away...

    I wonder if California's right to repair law that goes into effect 7/1/2024 will require Polk to continue to carry replacement parts for 7 years after production. I know this is only in California, but the state has a lot of pull to affect manufacturers for the rest of the country/world.

    Of course, this likely will not pertain to LSiM line, just current Polk products (on 7/1/2024).

    https://www.androidauthority.com/california-right-to-repair-law-3374535/
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  • xschop
    xschop Posts: 5,000
    MLK wrote: »
    Toolfan66 wrote: »
    VR3 wrote: »
    The days of long term legacy support seen to be over im afraid

    I don't think any of us expect anything like they have done with the vintage SDA's and even that has dwindled over the last 10 years, but with lines like the LSiM, and Legend, and maybe even the Reserve, they should be able to have parts for at least 3 years after the death of the line, especially to the people that have the paper work that they are the original owners.

    My LSiM's have worked flawlessly since I purchased them, so even the three years really wouldn't have mattered for me.

    I do have a brand new set of 703's put away...

    I wonder if California's right to repair law that goes into effect 7/1/2024 will require Polk to continue to carry replacement parts for 7 years after production. I know this is only in California, but the state has a lot of pull to affect manufacturers for the rest of the country/world.

    Of course, this likely will not pertain to LSiM line, just current Polk products (on 7/1/2024).

    https://www.androidauthority.com/california-right-to-repair-law-3374535/

    That thinking is akin to requiring you to own an electric lawn-mower....
    Don't take experimental gene therapies from known eugenicists.
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  • mpitogo
    mpitogo Posts: 504
    That is TWO now (first the L600) and now LSiM man Polk engineers are great. It's great validation of we already know.
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  • skrol
    skrol Posts: 3,372
    I guess when we buy new speakers we should hit up the parts department for spares while they have them.
    Stan

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    Other stuff:
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