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Zilch's AK Design Collaborative - Econowave Speaker

hhibrownsbac said:
Thanks Zilch ill give them a call tomorro. And while im asking questions I was reading a thread today on someone considering hacking up some vintage classics(dont remember what they were) but it was recommended to him to possibly make up a new baffle rather than destroy the original. This made sence to me and got me thinking about these that i have http://www.audiokarma.org/forums/showthread.php?t=196466 But they have almost 7 cubic feet of internal volume. With some bracing and new baffle they would be perfect canditates for either the 2225H or the 2235H(when i get them back), so would you have any ideas on whether they would work as-is or maybe close them up inside a little to maybe something around 5 cubic feet.
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You're gonna love the 2235H.:yes::thmbsp:

russellc
 
hhibrownsbac said:
Thanks Zilch ill give them a call tomorro. And while im asking questions I was reading a thread today on someone considering hacking up some vintage classics(dont remember what they were) but it was recommended to him to possibly make up a new baffle rather than destroy the original. This made sence to me and got me thinking about these that i have http://www.audiokarma.org/forums/showthread.php?t=196466 But they have almost 7 cubic feet of internal volume. With some bracing and new baffle they would be perfect canditates for either the 2225H or the 2235H(when i get them back), so would you have any ideas on whether they would work as-is or maybe close them up inside a little to maybe something around 5 cubic feet.
Click to expand...

2235H in 6.5 cubic feet, tuned to 28 Hz... f3 of 30 Hz. Two 4" diameter vents, around 10" long.

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I don't see any problem with that!

Regards,
Gordon.
 

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jrock7 said:
where should I try to stay ? a little below the Fs frequency or a little above for good bass performance
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In the region. Optimum varies with preference, driver, and internal volume. Build to your "best guess" nominal as determined using box modeling software, measure the result, listen to it, and adjust the duct length and thereby the tuning accordingly.... :thmbsp:
 
djnagle said:
Pure VooDoo my friend. Actually I did not measure them, I looked at the graph from JBL of the 4530 with the 2205 (which I understand is the same as the 2225 with more power handling).
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So how's the bass on those scoops/2225H compared to the big Imperials you were using?

russellc
 
Russellc said:
So how's the bass on those scoops/2225H compared to the big Imperials you were using?

russellc
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It is night and day. The Imps are, for all practical purposes, subwoofers. They did sub signals better than any I've ever heard. They were lacking in mid bass, it was there but 12 db or more down. The scoops are the king of midbass punch.....if the music dictates. I was listening to Eva Cassity last night and for the most part there is no midbass on that CD and what midbass was there, was detailed and accurate. Then I put on the Dobbie Brothers Taken' it to the Streets and, I think, the mid bass kick was interfering with my heart rythim (sp).

The perfect situation would be to have the Imps back doing sub duty but there is not enought room or $$$ for that.

Now, to tie this all back into the eWave thread, I am building speaker stands for the last week or so and had to take off my Edgarhorns and Heils, so I put the 12" round wave guide with ADS 1001 driver on top of the scoops until I get the stands done. They sound really good. I am using the CD comp on the Behringer 3400 and that is a little harsh but passable. Here is a link to my stands thread.

http://www.audiokarma.org/forums/showthread.php?t=235499
 
djnagle said:
It is night and day. The Imps are, for all practical purposes, subwoofers. They did sub signals better than any I've ever heard. They were lacking in mid bass, it was there but 12 db or more down. The scoops are the king of midbass punch.....if the music dictates. I was listening to Eva Cassity last night and for the most part there is no midbass on that CD and what midbass was there, was detailed and accurate. Then I put on the Dobbie Brothers Taken' it to the Streets and, I think, the mid bass kick was interfering with my heart rythim (sp).

The perfect situation would be to have the Imps back doing sub duty but there is not enought room or $$$ for that.

Now, to tie this all back into the eWave thread, I am building speaker stands for the last week or so and had to take off my Edgarhorns and Heils, so I put the 12" round wave guide with ADS 1001 driver on top of the scoops until I get the stands done. They sound really good. I am using the CD comp on the Behringer 3400 and that is a little harsh but passable. Here is a link to my stands thread.

http://www.audiokarma.org/forums/showthread.php?t=235499
Click to expand...

If scoops are the king of midrange punch, they must be a match made in heaven with the 2225H. It has a lot of punch in just a reflex box, I can only imagine the combo with the scoops!

russellc
 
Russellc said:
If scoops are the king of midrange punch, they must be a match made in heaven with the 2225H. It has a lot of punch in just a reflex box, I can only imagine the combo with the scoops!

russellc
Click to expand...

Yep Russell, they really work well. I was concerned that it would be too much, but on a good jazz cut, for example, there really is no punch, just good solid and really detailed midbass. But when you put on Joan Osborn....watch out. Cosmos had these exact drivers in boxes at the AKfest, before I took them home and put them in the scoops and they sounded great in the boxes as well. He was running the ewave on of the boxes and it sounded great.
 
jrock7 said:
Zilch , what happens when you tune (Fb )an enclosure less than the Fs of a woofer?
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Depends on the woofer. Some work well (high-Q woofers, generally), while some don't (lower-Q woofers).

It also depend on the box... larger enclosures (compared to "optimal" values for the driver in question) usually will want tuning closer to Fs of the driver, as a very general guideline. If, however, the enclosure is smaller, to the point of being near the smallest size you can have and still achieve non-bumped response (avoiding any response peaks in the midbass) with the driver in question, sometimes tuning the box below speaker Fs is necessary, in order to prevent response humps.

Regards,
Gordon.
 
Thank you, Gordon.

That certainly puts it far more succinctly than I could have.... :thmbsp:

280,158/6151= 45.5467​
 
How would using a JBL 2407J (16 ohm) compression driver affect things? I know I'll be down approx 3db from the 8 ohm version at the same voltage, but will this bring it's level down too far to match with a decent woofer?

I have a few hundred posts to sift through before I'm up to date on this thread again. Has anyone done a condensed version?

(oh no ... I feel a project coming on)
 
MartinQ said:
How would using a JBL 2407J (16 ohm) compression driver affect things? I know I'll be down approx 3db from the 8 ohm version at the same voltage, but will this bring it's level down too far to match with a decent woofer?
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I'm not seeing a sensitivity spec in the JBL data sheet, but BMS calls their version 113 dB, as I recall, so you should have no issues.

As to whether the E'Wave HF comp is compatible, I'll measure one and see.... :yes:
 
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