KennethSwauger · Moderator


Last Active
Unregistered / Not Logged In, Registered, Users Awaiting Email Confirmation, (COPPA) Users Awaiting Moderation, Super Moderators, Administrators, Moderators, Banned, Polk Employee, LSi Focus Group 1, LSi Focus Group 2, Better Club Polk, Council
  • Re: LSiM 707 bi-amp question

    The lower set of binding posts connect to the lower three bass components, the two woofers and the 6.5" mid-bass driver. The upper set of binding posts connect to the tweeter and mid-range components. I wouldn't recommend removing any of the internal crossover components.
    Cheers, Ken
  • Re: Electrolytic cap performance / behavior vs. others in a crossover?

    Electrolytic capacitors (both aluminum and tantalum) have series resistance and inductance and parallel resistance and inductance but also various combinations of series diodes and parallel diodes. If an electrolytic capacitor is properly polarized then most of the series and parallel diodes are biased on or off and the capacitor, more or less, behaves like a film capacitor. But not completely.
    Thus using an electrolytic capacitor in a speaker crossover design with near
    zero DC volts on both sides leads to various kinds of distortion, most of which are very audible.
    The larger the capacitor value the more series inductance it has and the performance at higher frequencies suffer (that may have been the cause of what you measured). A fix for this is a parallel reasonable value film capacitor.
  • Re: Electrolytic cap performance / behavior vs. others in a crossover?

    Most of the time speaker manufacturers will use "non-polarized" electrolytic capacitors, especially in the high pass part of the crossover. Inside these are two capacitors of twice the target value connected in series "back-to-back" (+ - -+) so that the unwanted effects of a "regular" electrolytic will be somewhat reduced.
    Not only is the part's cost a factor, but the size of a capacitor will be important to speaker designers. Imagine how in-wall and car audio speakers would look with large film type capacitors hanging on the back of mid-range drivers.
  • Re: Will reversing the polarity of drivers/tweeters work for inverted preamp with sda2a's

    Unfortunately that wouldn't work since it would happen at a "single ended" connection. It would have to be done at a "balanced" part of the audio chain, such as the back of a phono cartridge or a tape playback head or any true balanced cable. Somewhere the audio signal is represented by two separate yet equally important* conductor paths.

    (fans of "Law & Order" will get that reference)*
  • Re: tsx 330T a little bright sounding for music ??

    There is a way to reduce the tweeter's output. The speaker offers a dual set of binding posts on the rear of the cabinet. If you removed the binding post jumper plate between the two positive terminals and placed a small value resistor, say 4 ohms, between the two positive binding posts that would reduce the tweeter's output. You might want to try a couple of different values, a nice 3 Watt metal film resistor from Dale would be a good choice. I can probably find some values to send you if you'd like to try.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!


50 Answers250 Likes5 Agrees25 Agrees5000 Comments25 Insightfuls5 Insightfuls5 LOLs25 LOLs5 Likes25 Likes100 Likes25 Answers5 AnswersFirst AnswerPhotogenicName DropperFirst Comment10 Comments100 Comments500 Comments1000 Comments2500 CommentsSeventh AnniversaryCombo BreakerFirst AnniversarySecond AnniversaryThird AnniversaryFourth AnniversaryFifth AnniversarySixth AnniversaryAncient MembershipTenth AnniversaryNinth AnniversaryEighth Anniversary