econowave for small room

Status
Not open for further replies.
Jump to Latest
#23
picowallspeaker said:
I would fear much of the treble side, as a compression driver with its horn likes to shot the wave ahead and this will rapidly find a surface to reflect on it.

A high(-ish---) dispersion tweeter would produce a more natural...ehm -dispersion.
The need for a big enough waveguide to control directivity (1/dispersion) to
a big woofer is totally innatural for listening in a room when the size is predominant.
Click to expand...

Obviously you need to experience the constant directivity of one of these setups...."dispersion" is as natural as its gets....most are shocked by it in this particular application!

Russellc
 
#24
Doug Kim said:
I don't know what econowave is, but I recently finished 2 way speaker with active crossover using:

High: LE85 + Fostex H420 horn, crossed at 1kHz, driven by 300B single ended (Tubelab 300B SE)
Low: Eminence Kappa 15A + Parts Express 15" knockdown cabinet
PA Knock-Down Trapezoid Plywood Speaker Cabinet for 15" Driver

All I can say is WOW. Best speaker I've ever built followed by Jordan JX92 transmission.
Click to expand...

You are on a similar path. Econowave started as a very inexpensive JBL wave guide and equally inexpensive Selenium driver. This was combined with a crossover for this "top" which also included compensation to negate the falling response inherent to compression drivers.

This top would then be mated to various bass cabinets and drivers, all sorts of things were tried and t he more successful built up and documented including full crossover. Then more expensive compression drivers were worked up.

Then it evolved as Zilch got his Clio setup. Over on the Parts express forum he collaborated with the fellow who invented the PCD speaker design software and several versions were documented there, several at the end used your same trapezoidal box.

Russellc
 
#25
i have a 15" woofer lying around unused. for bigger woofer i guess xover point has to be selected as low as possible. i am thinking to cross at 800hz (assuming d220i or expensive de250 CD). if this doesn't work then i will go with 12" woofer.
@goldyrathore: which CD you are using with Ahuja 12" woofer? and what is xover point chosen?
 
#28
coherenceaudio said:
i have a 15" woofer lying around unused. for bigger woofer i guess xover point has to be selected as low as possible. i am thinking to cross at 800hz (assuming d220i or expensive de250 CD). if this doesn't work then i will go with 12" woofer.
@goldyrathore: which CD you are using with Ahuja 12" woofer? and what is xover point chosen?
Click to expand...

Problem is getting the high end to go that low....especially the 220 Selenium. I ended up with B&C DE 250...you can get 15 inch driver to work, I did, but used the JBL 2235H, which was used in the 4430 monitor, which was also 2 way with horn. It was considered the "Mother ship" of Econowave. See Zilch's older threads on Lansing heritage, "Babies", and "4430 Quick and Dirty" were good ones.

Russellc
 
#32
i found celestion cdx1-1745 CD which is said to be equivalent of de250 performance and measurement wise. its available locally for half the price of de250. i want to use this with first order xover which means xover point will be high. may be 1500hz or so. this means woofer has to be smaller like 8" or 10" which should be able to go flat upto 1500hz. for my small room i find 8/10" speaker boxes make more sense aesthetically and placement wise. so for this CD, i need to first decide the proper xover point, use first order xover and then decide which woofer (i.e. locally available) would suite. so where do i start?
 
#33
coherenceaudio said:
i found celestion cdx1-1745 CD which is said to be equivalent of de250 performance and measurement wise. its available locally for half the price of de250. i want to use this with first order xover which means xover point will be high. may be 1500hz or so. this means woofer has to be smaller like 8" or 10" which should be able to go flat upto 1500hz. for my small room i find 8/10" speaker boxes make more sense aesthetically and placement wise. so for this CD, i need to first decide the proper xover point, use first order xover and then decide which woofer (i.e. locally available) would suite. so where do i start?
Click to expand...

a 10" cannot get the needed pattern control as a 12".
 
#34
coherenceaudio said:
i need to first decide the proper xover point, use first order xover and then decide which woofer (i.e. locally available) would suite. so where do i start?
Click to expand...
Hmmmm...1st order: put a 10 Ohm resistor across the tweeter to minimize the resonance peak; start with 3.3 or 4.7 uF.

The tw/horn combo would then produce a response that needs more EQ than the one given by the capacitor only 🙄
 
Status
Not open for further replies.
Top Bottom