Help With Compression Driver/Horn Selection

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Scout 177

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Joined 2023
#1
I have been listening to Dynaudio C1's crossed at 250Hz with my low end coming from DIY Woofers with ScanSpeak, 32W/4878T01 Drivers. Sound is clean, detailed and quite amazing..............

However, I am longing for that Live, Horn Dynamic Sound that I am missing in my current setup.

I was thinking of just buying Klipsch Forte or Heresy IV's and get this out of my system, (or stay happy with them), however, what about DIY?

I can use my existing Woofers for the low end and just build the cabinets for the mid and tweeter drivers/horns........

I have been searching a proven receipe and just get more and more confused.

I am thinking to use active X-Overs and discrete amps.

Can a driver/horn guru on here make recommendations for me with respect to what drivers and horns to buy and build?

Thanks for supporting this ride............
 
#3
Hmm, for DIY horns @ 250 - 20 kHz we in theory want one horn to be 125 Hz to sqrt(40000/125) = ~2236 Hz XO + an octave overlap = ~4472 Hz to the tweeter, which will in theory be 2236 Hz - one octave = 1118 - 40 kHz for a balanced ~5.16 octaves* each out of a typical 5 octave limit, so the HF of both horns will in theory be (inaudibly) a bit rolled off.

In theory we want each to 'ring' at its mean = sqrt(125*2236) = ~528.7 Hz Fs; too low for any 1" CDs I'm familiar with, so may/will need at least a 1.4" or even one of the new coax CDs and sqrt(2236*20000) = 6687.3 Hz Fs, which not having any specs and/or 'hands on' experience with true (super) tweeter CDs, no clue if any have an Fs anywhere near this.

In short, nowadays we really need to limit the XO to > 500 Hz to buy ready made mid, HF horns now that prosound manufacturers no longer use simple horns for wide BW apps, so far better to do a forum search for DIYing an 'all in one' prosound DSL Unity/Synergy concept multi-way horn, which will give you the driver lists to buy or at least guide you to find ones locally available/whatever along with all the necessary design/build info for these simple conical expansion WGs.

*
ln(4472/125)/ln(2) = ~5.16 octaves

ln(40000/1118)/ln(2) = ~5.16 octaves
 
#6
GM said:
Hmm, for DIY horns @ 250 - 20 kHz we in theory want one horn to be 125 Hz to sqrt(40000/125) = ~2236 Hz XO + an octave overlap = ~4472 Hz to the tweeter, which will in theory be 2236 Hz - one octave = 1118 - 40 kHz for a balanced ~5.16 octaves* each out of a typical 5 octave limit, so the HF of both horns will in theory be (inaudibly) a bit rolled off.

In theory we want each to 'ring' at its mean = sqrt(125*2236) = ~528.7 Hz Fs; too low for any 1" CDs I'm familiar with, so may/will need at least a 1.4" or even one of the new coax CDs and sqrt(2236*20000) = 6687.3 Hz Fs, which not having any specs and/or 'hands on' experience with true (super) tweeter CDs, no clue if any have an Fs anywhere near this.

In short, nowadays we really need to limit the XO to > 500 Hz to buy ready made mid, HF horns now that prosound manufacturers no longer use simple horns for wide BW apps, so far better to do a forum search for DIYing an 'all in one' prosound DSL Unity/Synergy concept multi-way horn, which will give you the driver lists to buy or at least guide you to find ones locally available/whatever along with all the necessary design/build info for these simple conical expansion WGs.

*
ln(4472/125)/ln(2) = ~5.16 octaves

ln(40000/1118)/ln(2) = ~5.16 octaves
Click to expand...
Good to know. My woofers can be crossed much higher than 250Hz. Below is their response. What would you recommend if they were crossed at or above 500Hz. Thanks!

1694181491234.png
 
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