Just the answer I was looking for--thanks Norman!
Yes, I want my desktop speakers to only sound great when I'm sitting down. Always wondered what you were up to but from what I gather (or attempt to understand) Using two of them in vertical fashion will narrow the sound field so off axis is limited?
Still trying to wrap the cranium around that--that would be a GOOD thing, right? At least for a desktop/computer use it should limit reflections? 😕
Yes, I want my desktop speakers to only sound great when I'm sitting down. Always wondered what you were up to but from what I gather (or attempt to understand) Using two of them in vertical fashion will narrow the sound field so off axis is limited?
Still trying to wrap the cranium around that--that would be a GOOD thing, right? At least for a desktop/computer use it should limit reflections? 😕
You'll be nearfield so it'll be really bad. Vertical lobing will be you can't move at all and you'll have to get them up to ear level. I don't see that working for a desktop system.
Generally directivity is rarely a good thing, esp. when it only applies to a rather limited part of the spectrum. It can be tolerable with FR drivers if it's not to much and because they more than make up for it in other ways.
Two or three ways speakers are also directional in parts of the spectrum, and that can be even more objectionable/unnatural sounding out of the sweetspot. IE. a valley in the upper midrange will sound weird compared to a gentle roll-off of the top range, that we are already familiar with from natural circumstances.
But generally the FR guys saying the beaming is "good" because of less reflections are just sour grapes and probably defending their preference for penis substitute large drivers that beam like crazy and but can play louder. 😉
Two or three ways speakers are also directional in parts of the spectrum, and that can be even more objectionable/unnatural sounding out of the sweetspot. IE. a valley in the upper midrange will sound weird compared to a gentle roll-off of the top range, that we are already familiar with from natural circumstances.
But generally the FR guys saying the beaming is "good" because of less reflections are just sour grapes and probably defending their preference for penis substitute large drivers that beam like crazy and but can play louder. 😉
For their dual driver computer speakers, Altec Lansing put some kind of x/o on one driver, right? Not sure if I remembered right but I think they use a single capacitor rather than an inductor
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If you wire 2 drivers in series, you use a shunt cap on one driver to cut its HF. One requires a current amp to get the power increase needed to get typical baffle step compensation. (ie with a (true) voltage amp you only achieve double the cone area at low frequencies, no gain in sensitivity)
dave
dave
Good to know (altho some US brands seem to get patents on stuff they shouldnt)
For 2 x gen 3 CHR70s what would be your choice, parallel/inductor or series /cap ?
For 2 x gen 3 CHR70s what would be your choice, parallel/inductor or series /cap ?
A parallel arrangement will lower impedance (gen 3 are 8 ohm right?) so you'll get more power, versus 16 ohms!
Dave what do you think of running a series XO on it but instead of a cap using a resistor? Would that cut down the high end too much you think? I think it would be great for a basshead that only has small drivers. 😉
Looks like Bose just got a patent on using helmholz resonators to kill the 1st unwanted harmonics in a TL. The Germans have been publishing articles on those for 10 years.
dave
Dave, Maybe we cd start a thread just for this stuff, in this case Tymphany - Variable Amplifier Impedance
scroll to the bottom
scroll to the bottom
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Yes Dave something like that but because there are two FR's, you remove the cap and have just the coil and resistor. I am wondering though, to keep it high enough impedance, you would have to make the resistor fairly large and end up losing too much on the unfiltered driver thereby making it rather low sensitivity.
Cal,
These are usually done without the cap -- like in the 3-way map.
Yes, a lot of power gets eaten up by the R.
With 2 FR in series, shunting one with a cap rolls off the highs of that driver, with a coil it rolls off the lows.
dave
These are usually done without the cap -- like in the 3-way map.
Yes, a lot of power gets eaten up by the R.
With 2 FR in series, shunting one with a cap rolls off the highs of that driver, with a coil it rolls off the lows.
dave