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About RTally

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  1. For $250 a pair, they should be in pristine condition, freshly refoamed and recapped, and the veneered, beveled front, not the utility cabinet. I paid $50 for my OLA that needed to be restored. I've seen others for sale between $100 to $200, depending upon condition. Other places to check are Craig's List and Facebook Marketplace. As for what to look for, if you audition, do all the drivers work, or, if no audition, does the woofer move freely and the drivers appear undamaged. Are the speakers recapped and have they been properly refoamed? For a lower, more reasonable price, I would prefe
  2. Location information would be helpful. Also, please list your asking price when you decide to sell.
  3. RTally

    OLAs again

    I use a similar technique except I glue one side and then clamp it while I work on the opposite side. I clamp the opposite side when I get it glued. I have some aluminum bars (about 1/8" x 1/2" x 20") that I place against the glued section. I use paper spring clips as clamps. It is compact and works well for me. I can usually get the cloth tight enough using this method without resorting to spritzing. The Aileene's glue has enough working time to let me stretch the fabric to align the fibers with the edge.
  4. Schematic from AR is doing some fancy crossover work with the upper midrange. The 40 uF cap, 6 ohm resistor, and the 1.37 mh inductor are in parallel with the VC. A capacitor and resistor alone would form a Zobel network, which is used to smooth the impedance curve for that driver. The resistor in the Zobel network defines the upper limit for the impedance over the frequency range in which the capacitor presents minimal impedance. See https://speakermakersjourney.blogspot.com/2016/12/crossover-basics-zobel_8.html Generally, a driver will be attenuated by a Zobel network dependin
  5. I had a pair of Advents that had dark colored open-celled foam inside. That foam is speaker fill and does not degrade over time. It is very similar to the foam often found in seat cushions. It is safe. Put the foam back in the speakers in the same relative position that you found it.
  6. RTally

    Baby II crossover

    Generally, I find the best source of crossover information is what is installed in the speaker. Manufacturers often make changes during production. And not all the changes are documented. Sometimes the part changes are due to component availability. Sometimes it is a design change. I suggest waiting until you have the speakers in-hand and then inspecting them to see what is installed.
  7. RTally

    CB-10 crossovers

    The tweeter is wired out of phase to the woofer. Why? The designer determined that the speaker sounded better at the crossover point by shifting the tweeter phase. It may be that the the phase angle between the two drivers was sufficient at the crossover point that wiring the tweeter out of phase made for a flatter response at the crossover. The 7.5 ohm resistor forms a portion of a voltage divider circuit with the other resistors. With the switch in the illustrated "Decrease" position, the voltage divider is a 3 ohm equivalent resistance and a 7.5 ohm resistance. Moving the switch to Fla
  8. Please do not ruin any speakers by trying that unless you plan on testing some sacrificial speakers over time. it is hairbrained ideas like this that caused people to think latex, Permatex, white glue, and other crap was a good idea for surrounds. The proper butyl compound is readily available and has been proven to not damage speakers.
  9. With current camera technology, large-format scanners are not necessarily needed for scanning drawings. I am finding that using a camera to capture documents is more convenient and typically as good a quality as using a scanner. Line drawings, in particular, do not require high resolution scanning. A good option to scan large drawings is to mount them on a wall and position the camera on a tripod with the lens centered on the drawing. If a smartphone camera is used, depth of field can be increased by using very bright lighting. It is important to ensure that the drawing is flat. I am use
  10. There are two parameters of importance for capacitors. The obvious one is capacitance value. The other is equivalent series resistance (ESR). A change in capacitance value will impact the crossover frequency. For a first order filter, it takes a large capacitance value change to create an audible null or peak in the frequency response. A change in ESR will attenuate the tweeter volume for a high pass filter. Generally, changes in ESR will be more audible than capacitance value changes. Too high of an ESR causes the speaker to sound muffled, as if a blanket is thrown over the speaker. If
  11. I have a pair of Legacy II speakers that I refoamed. I understand your love for them. The first thing to do is to pull the grills off and check the surrounds on the woofers. The surrounds are foam and have a limited life. If you have had them for a couple years, it may be time to refoam them. Look for the foam being cracked or brittle. It should be soft and supple with no breaks. Post pictures - just make sure that they are sized to be 100k or smaller.
  12. Testing the tweeters is easy if you have an ohmmeter. Remove the tweeter, disconnect at least one wire from the tweeter terminals, and measure VC resistance with an ohmmeter. If you put in 8 ohm tweeters, they should measure about 5 to 7 ohms resistance. If you don't have a meter, get down to Harbor Freight and buy a cheap $2.99 meter. Those are fine for troubleshooting and quick checks. While you are removing drivers, pull the woofer and inspect the crossover components. Look for any discoloration of the resistors. Measure the resistors to see if they are still resisting properly. Hopefu
  13. RTally

    AR 58s

    Not series, but parallel. When capacitors are wired in parallel, the capacitance values are added together. You can get 8 uF by wiring two 4 uF caps in parallel. uF is same as mfd (microfarad). The voltage rating does not matter as long as it is equal to or greater than the original voltage rating. It is easy to go down the rabbit hole when recapping speakers depending upon how much you want to spend. It is generally accepted to replace old electrolytic caps with poly caps. I prefer Audyn Q4. Others like Dayton caps. Those two choices are the lowest cost options for non-electrolytic
  14. The best way to ensure that the surrounds are sealed properly is to test them mounted in the cabinet. Push the woofer cone in and hold for about 20 seconds. Longer is better. There needs to be enough time for the pressure in the cabinet to equalize with the ambient air. Quickly release the cone and measure the time it takes for the cone to return to resting position. Any time longer than about 1 second indicates a good seal. Longer is better, but rarely achievable beyond a few seconds. Less than 1/2 second, means you should check for air leaks. Before adding more dope to the surroun
  15. I quick google search indicates that the Rogers LS3/6 are very good speakers. I would have snapped up those speakers. When I see a deal like the above, my first contact with the seller is to give him my phone number and tell him that I am ready to buy and can meet him wherever he wishes at any time, preferably now (considering drive time). My only questions are when and where. If I have any other questions, I wait until I see them. When good deals pop up, you have to react fast or expect to lose out.
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