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About efzauner

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  1. Hello I have a chance to get 2 of the 12 inch woofers from the KSP300. It is a sealed cabinet for the sub woofers. I can estimate the volume from the dimensions, assuming the top 12 inches or so are for the mid and horn only. That would give about 2cuft. But does anyone have a pair or know the internal volume of the box for the big woofers? They are K-1066-K.. Or if I had the TS parameters I could design an optimal sealed box. thanks
  2. Not mine https://www.kijiji.ca/v-stereo-systems-home-theatre/barrie/vintage-klipsch-15-subwoofer-and-amp-ksw-15-ks-15/1433427798?siteLocale=en_CA&enableSearchNavigationFlag=true&uli=true
  3. If you called it a subwoofer maybe its because you want lots of bass just like in your car? You can't just turn up the bass knob and volume. Is this what you tried? LaScalas where not designed to go very low, low end is 3dB or more down at 50 Hz. and cuts off sharp because the horn just wont handle low end. The K33 is not in any way a "high excursion" woofer. Its XMax is maybe 1/4 of an inch, not the inch of travel you may be used to with car or big home subs. If you indeed pushed 100watts or so thru I hope you where wearing ear plugs because that would have been 120dBm SPL or so. Where you playing that loud?
  4. its hot glue at the factory. so a gun would be ok I also like the various Goop products. The industrial type seems the best.
  5. all correct. but 1/4 to 1 db is sort of moot when you consider room effects. Nobody can hear 1/4 db. If you are going to nit pick about 1/4 db then you cannot simply ignore other effects. You cannot just focus on one issue. That is what engineering is. My point was that people will focus on one thing because they think they read something on the internet without any ability or understanding on how other parts affect performance. I am sure the OP would not have been able to do the analysis you have. but hey "what about skin effect?"
  6. you may wish to reconsider " For pure square waves the RMS voltage is the peak voltage." If you follow the wiki link I provided they give you some rms values of simple waveforms. For the rest you need to calculate. Or use a true RMS meter that is good for any waveform.
  7. RMS Root Mean Square For the gory details check wiki https://en.wikipedia.org/wiki/Root_mean_square Can't really do a better job. But basically squaring the voltage before averaging it over time (often a period if it is a simple waveform) , then taking the square root. So all values are positive. The reason you square the voltage before averaging the values is because for power calculations, Power is proportional to the square of voltage, so you have to give more weight to higher voltages. In other words, if voltage is 2 volts for half the period, and 4 volts for the second half, you cannot simply average them to (2+4)/2 = 3. You have to take square root of (4+16)/2 = square root 10 = 3.33 For audio power it means using the RMS voltage of the signal, then using Power= V^2/R where R is usually a pure 8 or 4 ohm resistor. So of you have a 10Volt amplitude signal (that is -10v to 10v) sinewave signal, the RMS value is 10/sqrt(2) or 7.07 volts to calculate the power into 8 ohms.. it is P=7.07^2 / 8 The term "rms power" as used for audio is actually incorrect as you do not take the square root of the average of the square of power. The term implies "calculate power using the RMS voltage" If you had a varying signal as in real music, you could average out the power over time, but it makes no engineering sense to take the RMS average of power over time.
  8. Continuing on this topic with the Belden data If you use a stranded 12 gauge, there is still conductivity between strands so the skin effect would be somewhere between 0 and 33 % more resistance. Certainly not 0. Unless each strand is insulated.... as in Litz wire. rather costly... would be easier and cheaper to just go with a thicker gauge or 2 thinner lines. Yes LItz wire does what it is supposed to do. but I doubt it makes much noticeable sound difference. Sadly even with reasonable companies that typically makes good engineering choices based on real differences, our world of esoteric audio marketing has forced the use of litz wire inductors just because... customers have been conditioned to ask for it. Note that litz wire is mainly for higher frequency uses. not audio. https://en.wikipedia.org/wiki/Litz_wire note that at 60Hz Skin depth is 1/3 of an inch.. at that depth the current density is 1/3 or about 1/3rd of what it is at the surface... That is why in high power delivery they use flat conductors...
  9. Thank you Deang! That is a very simplified reduction of the math.. So a 12 gauge solid conductor at "75%" used at 20Khz would offer 33% more resistance than at DC. A 10 foot run of 12 gauge is 20ft x 1.6 mOhms per foot that is 32 mOhms.... at DC At 20Khz it would be about 43 mili ohms. Not much difference I would say in series with a 8 ohm driver... I rest my case... alxlwson I am not questioning your claim about skin effect in high current power applications. When currents are huge, the voltage drop and power consumed by resistance across feed cabling can be important compared to the power of the motor... a 1% improvement in efficiency in a system is huge if you have to pay the power bills.
  10. why is there a difference, please back up your claim. You basically have your speaker wire in series with the LF inductor and the voice coil. lots and lots of solid core wire there... much longer than in many speaker cable runs. What exactly is your recommendation based on?
  11. how big is your room? Do you really need 7.1? a good 5.1 is better than a cheap 7.1 Room acoustics is a major part of the sound. If you will only use it for 6 months why bother? You can also find many used 5.1 receivers for really cheap. They may not be HDMI but they have the basics and all you need is an digital audio input. you can pick one up for $100 often. As for stereo amps... there are 1000s of models out there... really... everyone will have a preference. and frankly most here really dont wan to get into "what's the best" sort of discussion as they never end and usually no clear conclusion. There is no speaker vs amp cross reference chart... You can also find entire 5 channel speaker setups for sale used at a fraction of new price.. Many poeple moving, down sizing... My entire system is used the Elite was even a store demo.
  12. Um er... lots of words with no science to back it up. Yes to skin effect equations. Yes, many high power power distribution also use flat conductors to reduce skin effects, but please use the *well documented* knowledge of skin effect in addition to basic electrical circuit theory including linear superposition and ohms law to back up your claim in audio applications... Perhaps a graph that shows skin depth vs frequency, equivalent resistance vs frequency, perhaps dB attenuation vs frequency.. You know the normal kinds of analysis used in the audio field. I am not implying that skin effect does not exist but without numbers there is no way to tell if it really matters much. PS last time I looked most speaker crossover inductor wire is solid.
  13. The subwoofer driver would probably be grossly less sensitive than the Cornwall woofer.. plus it wont go high enough in frequency to meet the midrange cross over frequency at 600Hz. Plus honest.. the Cornwalls go down to 30Hz . you dont need more for all music apart from the most extreme pipe organ or electronic music with lots of exaggerated bass.
  14. who was the collector? I purchased a pair of LaScalas 15 years ago from user name "Dodger" he had lots of Klipsch.. and a wife that didn't appreciate it.
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