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r3x

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  1. it's a jelco. Roll up some lead tape and insert it into the back of the counterweight stub .
  2. In house bass mid drivers... CaRMA: “Concentric and Radial Mode Attenuation”, vifa tweeter. Good luck.
  3. Breezin is a must-have. If you like that, then 'in flight' would be the next one to get.
  4. VinylChef, your pics show you measuring a cap on the inductance range. That ESR number will be erroneous. Your meter appears to be able to measure ESR, and D of caps, according to the spec sheet.
  5. Well worth fixing. I have a soft spot for BBC bextrene drivers. I'm listening to some old KEF speakers driven actively from a DCX2496 crossover at the moment. A friend's dad had some BC1s (very similar to yours) many moons ago. I thought they were quite special too.
  6. Quite right. Here is a complete version. https://www.diyaudio.com/forums/multi-way/335993-rogers-studio-1-a.html The title is wrong in the above thread. It's for a studio 1, no 'a'.
  7. https://www.markhennessy.co.uk/rogers/ls36.htm#rogers-studio1
  8. The resistors will likely be fine. They should never be mounted like this though, they should be spaced away from the circuit board. Check the solder joints, they may have work hardened. Replace those 3 electrolytic cap while you have the iron warmed up, they'll be miles away from their nominal values.
  9. There we go again. Who are you to suspect me of anything?
  10. Your belief that square bracing must cause turbulence is the 'belief' to which i was referring. You accused Dave of 'spouting'. Can you think of no mechanisms other that air movement to support your arguments? Turbulence can occur in ports, where air velocity might be high, but inside a cabinet? No-one made any comment on the 'belief' that these changes will make a difference to what you hear. Indeed, mounting the xover outside the cabinet is a great idea for many reasons. Experimenting with loudspeakers can be quite rewarding or frustrating, but no-one discouraged you from doing so.
  11. I've not made this, i've spent no time optimising it or even trying to make sure the results make much sense, but this is what i mean...
  12. V1 is the input. Imagine there is an RCA socket there, or perhaps the wiper/switch on your pot/attenuator.
  13. V2 +15V, V3 is -15V. R5 is the load resistor. Increase the R5, 23k to something like 220k or more (just to make sure that the output cap C2 is never charged up when you plug something in) and that is your output. R9 is 47k. You can simplify this circuit a lot, at the expense of performance. Q2 can be replaced with a simple link between emitter and collector and Q3 & Q4 can be replaced with a resistor. You'd be left with a simple emitter follower with slightly less gain and much more distortion. https://en.wikipedia.org/wiki/Emitter_follower Circuit implementations are common.
  14. The buffer sits after a ladder attenuator, before a dividing network that splits the signal up into 2 high pass and 1 low pass outputs. These passive dividing networks require constant impedance being seen both upstream and downstream. The sound? I can't separate it out from the other changes. Combined with the upgraded filters the SQ jump was huge. It's better than just a passive device, in my unique situation and probably better than a passive devices in most situations, but as always YMMV. It was the simplest circuit (emitter follower) backed up with best linearization i'd yet seen. I took the circuit, drew it out in microcap. Swapped out the transistors for the best low noise transistors i had lots of, messed about with values and biases, implemented it and tried unsuccessfully to measure it.
  15. Did you read what i said or just look at the pictures? I listened to it just last night.
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