A 4-way build

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Viper_user

Viper_user

Member
Joined 2009
#1
Hey Guys!
I need your input on this project with active crossover. See pictures.
The three way box will contain:

tweeter: Scan Speak 9700 (already got)
mid: LPKM 130/50 / 120TT 2" (already got)
midbass: Scan Speak 8542 6.5 inch (planning to buy)

In the back of the 3way box I will put a bass reflex opening for letting the membrane move more freely (not in the pictures yet). The walls will be 21mm thick and the volume around 21L. Both baffles are 260cm wide.

(The 2 basstowers is at 45L and already done and have an 8" driver with very nice "boom capacity").

I also have found 2 pcs of 4-channel amps and a OpenDRC DA-8 for digital crossover with built in DAC's, so most parts is set and done except the 3-way box and the mid bass. Any thoughts?

Cheers!
 

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#5
I'm not sure I understand why the 6.5" driver needs to be there.

An 8" should get up to meet a 3" dome just fine. Adding an extra driver would IMO just mean additional headaches in getting the whole thing to sound good.
Click to expand...


We choose to go to the Moon in this decade and do the other things, not because they are easy, but because they are hard. 😀

The 2" driver sounds good down to 850Hz in a present setup. The idea was to limit the intermodulation on the bass cone and what i can tell it should start off at 500Hz. Maybe a Scan Speak 15W/4434G00 5.5" will do good in a 3way?
 
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#6
If you are going to make a change, I would move to a bigger woofer. In your current concept, the 8 inch woofer is the weakest link. Moving to a 10 inch would be better, and a 12 or pair of 8's would be better still.
 
#7
hifijim said:
If you are going to make a change, I would move to a bigger woofer. In your current concept, the 8 inch woofer is the weakest link. Moving to a 10 inch would be better, and a 12 or pair of 8's would be better still.
Click to expand...

Counted the bass towers today and they were two, but two 10's would be an intressting upgrade.

As it is now the last Hz i can get from them is 36 in this test:
Online Tone Generator - generate pure tones of any frequency
 
#8
That is the same tone generator I use the most; there are others out there also that are very useful.

I did a tower literally decades ago with dual 10 in. woofers; these were poly' cone from the Peerless CC line. Some of the cleanest and best sounding bass of any of my designs I think ever. Box tuning was 23 Hz and so the 27.5 Hz low A of the piano came through with full authority and "realism".
 
#9
hifijim said:
If you are going to make a change, I would move to a bigger woofer. In your current concept, the 8 inch woofer is the weakest link. Moving to a 10 inch would be better, and a 12 or pair of 8's would be better still.
Click to expand...

Very good point.
And if you make that box with woofer square and chubby, you can place your 3way box on top of it and save yourself work to make the stand. Plus it saves floor space too.
 
#12
Great; keep us up to date on progress. My 3 1/2 way might now be considered a 4 way, 4 1/2 way or even 5 way. Crazy? Yep; a little...not yet finished though; still tweaking and fine tuning; may end up with the original idea of 3 1/2 way YET if I can get a good tonal balance with the ever important articulation, resolution and "inner-detail" I so desperately want...
 
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