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Old 20th October 2005, 09:21 PM   #1
johnb is offline johnb  Sweden
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Default Two way "fullrange"

I am planing on building a two way speaker using the FE168EZ as a mid/tweeter and compliment it with a sub. So far so good, but the all the questions start when decide how to do it. Put the FE168EZ in a small sealed or BR box is one, and what type of bass enlosure is another.

But the biggest question is the crossover, passive then the bas has to be of high sensitivity since my set amp with 300B puts out around 8w. Active the I will need another amp for the sub.

What are your thoughts on this Run the fostex fullrage in a small ecnlosure and buy active subamps for the subs wich has crossover frequencies etc on them.

Any ideas are welcome. For reference i have the Basszilla but I have never heard and ob and neither have the space for it.
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Old 20th October 2005, 09:36 PM   #2
Dumbass is offline Dumbass  British Antarctic Territory
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Looks like 3.7L sealed box gives -3dB around 150Hz. Roll-off is 12dB/oct (2nd order), which you could of course make steeper by adding a high-pass filter.

If it were me I would do that, and then use an active setup (4th order L-R for low-pass?) with high-wattage amp for the bass drivers in sealed cabs. I believe a relatively inexpensive prosound stereo power amp could be used, I'd check eBay or what.
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Old 21st October 2005, 01:40 AM   #3
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If you have a pre-amp I would definately go active, you'll have figure out what slope and frequency, but I would guess a second order on the fostex @200Hz and a fourth order on whatever you deciede to run for the bass module. This is assuming stereo bass units. Passive is certainly a good option as well but you would need a larger cabinet to keep up in effeciency with the fostex, and you might want to move your crossover up to save to much of a crunch on your wallet.
Joe
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Old 21st October 2005, 07:41 AM   #4
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FE168, certainly not bass reflex, sealed is an option to get a nice rolloff and some load, best is probably open baffle (Illusus has a similar system -- currently he is using 166ESR, but talking about 168)

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Old 21st October 2005, 01:35 PM   #5
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I am doing something somewhat similar, Visaton B200's being run fullrange or I may stick a filter on the amp to roll them off ~70 Hz and a sealed Rythmik Audio servo sub in each with the matching servo amp.
I have everything except good weather to get started in earnest. I cut the baffles already but have to route the holes etc.
If you can I would go open baffle or at least try it for the mid driver.

Andrew
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Old 21st October 2005, 06:25 PM   #6
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I'm doing exactly that of which you speak. However, going passive at this point. I'll be using the 168 open baffle to start with over the Fostex FW305 12" woofer. If the OB doesn't work, I'll go sealed. Joe Cole has been helping with some of the details, as he's gone in a similar direction, just with different drivers. As posted above, Illusus has as well. Sounds like he's also added a ribbon tweeter to his upper end.

Per a suggestion of Wayne at Pi Speakers, I'll be adding a first order cross over to both units to cross at about 200 hz. I will be experimenting with ribbon tweeters as both supertweeters and a full on tweeter. I may try biamping as well, as I happen to have an amp that could work nicely for the low end.

Hoping to start cutting wood this weekend, but not sure it'll happen with the weather. I have to work outside as I'm in an apartment.

Hope this helps a bit.
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Old 21st October 2005, 06:27 PM   #7
smbrown is offline smbrown  United States
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Only caution on the idea of using a prosound amp.. if it has an internal fan, that can add a lot of noise to your listening room background. I know by experience... bought a Crown (202 something if I recall correctly). Boy, those fans are noisy. Tempted to open the case and disconnect them.
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Old 21st October 2005, 07:28 PM   #8
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except good weather
I saw some news footage of the Caymans -- how did you make out thru Wilma?

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Old 21st October 2005, 07:30 PM   #9
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Originally posted by one1speed
I'll be adding a first order cross over to both units to cross at about 200 hz. I will be experimenting with ribbon tweeters as both supertweeters and a full on tweeter. I may try biamping as well, as I happen to have an amp that could work nicely for the low end.
I've at least 2 "similar" trials in the works (althou with some unobtainium TBs). Will try both series XO & i have breadboarded up a subtractive to trial in an active system.

dave
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Old 21st October 2005, 07:38 PM   #10
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"I've at least 2 "similar" trials in the works (althou with some unobtainium TBs). Will try both series XO & i have breadboarded up a subtractive to trial in an active system."

Very cool. Well, keep us posted as to your results and thoughts. Thanks!
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