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Multi-Way Conventional loudspeakers with crossovers

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Old 13th January 2013, 10:48 PM   #31
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omg

go Active xo!

if you are really serious then why monkey around?
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Old 13th January 2013, 11:19 PM   #32
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Quote:
Originally Posted by wintermute View Post
I believe it will also be providing attenuation as well. as power must be being dissipated in the resistor. but messing with it would require redoing the rest of the crossover.
Tony.
Yes, the second resistor does attenuate. The trick is not to overdo it so that you still have some room to attenuate using the first resistor.

I do this all the time because with the higher impedance, it allows me to use smaller capacitors and inductors (read that as lower component cost ). Another advantage is power amplifier distortion is lower. Whether it's audible is another matter.
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Old 14th January 2013, 01:22 AM   #33
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tricky It is not something I had considered or come across before!

@KMossman, same could be said to tube amp followers (I'm not one) telling them they should go Class D Some of us just like to do things the old fashioned way

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Old 14th January 2013, 06:23 AM   #34
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The 4ohm resistor must have been too large and messed with the design (lifeless); however when replaced with the 3.3ohm they came back to life.

I wasn't that unhappy with a 2.2, sure was bright and cheery.

Last edited by ODougbo; 14th January 2013 at 06:39 AM.
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Old 14th January 2013, 12:36 PM   #35
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That's the same value I have at the front. I crossed the XT25 at 2,500kHz to the SF W17RC.

My network is just to have an idea of how the SF sounds like with this particular Vifa. If I decide to proceed further, I'll do FR measurements to determine the acoustic crossover and fine-tune from there.
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Old 14th January 2013, 01:33 PM   #36
ODougbo is offline ODougbo  United States
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Interesting - I'll have to dive into that mid/woofer. What size box are you thinking?

If ported, I might build a W box with flare ports.

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Edit - .42 vented...hummmmmmmm

Last edited by ODougbo; 14th January 2013 at 01:37 PM.
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Old 14th January 2013, 03:30 PM   #37
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My box is 13 Liters Bass Reflex. Tuning is with 2" PVC pipe. Length = 6.2" for Fb=50Hz.

The Silver Flute W17RC I'm using is the shielded version. I doubt the unshielded one will vary greatly. Should be quite safe to use my T/S.
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Old 14th January 2013, 07:43 PM   #38
ODougbo is offline ODougbo  United States
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Thanks Mike - I did order a pair early today.
So the scoop is I'll build a W box - tuning is done with semi built boxes & clamps; tuned @ 50hz. [Odougbo is Jedi Master at this]

We'll see how they compare to the W5-1611SAF, which are getting some rich bass.
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Old 15th January 2013, 12:53 AM   #39
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Something to ponder - the W5 box is slightly larger (18.5l) with a 3.3" port (if I used a port).

The Silver Flute box will be 5 liters smaller with a port almost double the length (6").


Edit - might be a good idea to build the Silver Flute box leaning to the largest size possible - and shrink the port size.
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Last edited by ODougbo; 15th January 2013 at 12:58 AM.
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Old 15th January 2013, 08:01 AM   #40
ODougbo is offline ODougbo  United States
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1st stab at this - plotted in WinISD, my results were similar what was posted in specs. Of course the plan is to enhance the lower end with the 2 flanking rectangle ports.

The TB box is a good reference to work with - the TB's ports are .5 thick x 10" deep x 7" wide (estimated).
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