Flatter than flat. PHL 10" and Beyma 1,4"

Lindell · 5th May 2009, 12:20 PM

I'm messing around with 1,4" drivers and I just built a box like this:

Measurements done at 2m hight and 50cm on-axis in our huge recording studio room, hence the great bass measurement.

I will use the loudspeaker for critical'n'loud and emotional monitoring in my recording studio.

Box is 80l tuned to around 30Hz. 10" woofer is PHL 3002. 1,4" driver is Beyma CP-755Ti and Horn TD-385. -3db @ 25Hz and -3db @ 21kHz.

DSP processor is Ground Sound DCN23. I can post the dsp settings if anyone wants to build it.

The sound is amazingly fast and "in yer face". Tight, deep and powerful bass. Stereo image is very accurate. Depth is amazing.
I was very sceptical to 1,4" horn drivers but they do deliver and very live like sound.

Pretty excellent graphs eh?

Rock on,

wigginjs · 5th May 2009, 12:29 PM

Wow, yes, most impressive. I am amazed by the depth available from that 10.

Salas · 5th May 2009, 01:27 PM

Where is the reference axis vertically? Between drivers or on horn's centre? Any lateral off axis graphs to see? 22.5-45deg would be informative. How much the dsp pushes the 10 inch for bass aid? Yes it would be very informative to see the dsp curves and maybe an impulse graph. Nice looking btw.

ttan98 · 5th May 2009, 02:00 PM

My speakers configuration is similar to yours,
ie

10" alnico woofer
B&C De250 compression driver
RCF H100 horn

all housed in a 70l bass reflex cabinet

I was able to get fairly flat too, sounds very good as well, open and dynamic. A worthwhile exercise.

I am currently designing and building another system(open baffle), trying to make the sound better than above system.

Happy listening.

Lindell · 5th May 2009, 03:10 PM

Salas,

Microphone is pointed exactly between the horn and woofer at 50cm distance.
I will measure off-axis respons as soon as I can.
There is no bass boost to get so low. The cab and port makes for the lowest freq's. I have only notched it flat.
You can see the impulse respons above.

Cheers,
L

Quote:

Originally posted by Salas
Where is the reference axis vertically? Between drivers or on horn's centre? Any lateral off axis graphs to see? 22.5-45deg would be informative. How much the dsp pushes the 10 inch for bass aid? Yes it would be very informative to see the dsp curves and maybe an impulse graph. Nice looking btw.

Lindell · 5th May 2009, 03:11 PM

Quote:

Originally posted by wigginjs
Wow, yes, most impressive. I am amazed by the depth available from that 10.

Thanks,
Yeah me too....

qquickk · 5th May 2009, 03:32 PM

Is that a coated paper cone? Great extension for 80l.

winslow · 6th May 2009, 03:32 AM

Nice compression drivers. I have a set of the neo motored versions and find them to sound very good.

BHTX · 6th May 2009, 03:50 AM

Quote:

Originally posted by Lindell
Pretty excellent graphs eh?

Step response is mangled. Woofer is severely lagging behind.

BHTX · 6th May 2009, 06:15 AM

I was just kidding btw, kinda being a smart ***. Looks very nice.

5th May 2009, 12:20 PM	#1
Lindell diyAudio Member Join Date: Dec 2005 Location: Planet Earth	Flatter than flat. PHL 10" and Beyma 1,4" I'm messing around with 1,4" drivers and I just built a box like this: Measurements done at 2m hight and 50cm on-axis in our huge recording studio room, hence the great bass measurement. I will use the loudspeaker for critical'n'loud and emotional monitoring in my recording studio. Box is 80l tuned to around 30Hz. 10" woofer is PHL 3002. 1,4" driver is Beyma CP-755Ti and Horn TD-385. -3db @ 25Hz and -3db @ 21kHz. DSP processor is Ground Sound DCN23. I can post the dsp settings if anyone wants to build it. The sound is amazingly fast and "in yer face". Tight, deep and powerful bass. Stereo image is very accurate. Depth is amazing. I was very sceptical to 1,4" horn drivers but they do deliver and very live like sound. Pretty excellent graphs eh? Rock on,

5th May 2009, 12:29 PM	#2
wigginjs diyAudio Member Join Date: Dec 2003 Location: Columbia, SC	Wow, yes, most impressive. I am amazed by the depth available from that 10. __________________ The Four Chairs DIY Home Theater

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5th May 2009, 01:27 PM	#3
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Where is the reference axis vertically? Between drivers or on horn's centre? Any lateral off axis graphs to see? 22.5-45deg would be informative. How much the dsp pushes the 10 inch for bass aid? Yes it would be very informative to see the dsp curves and maybe an impulse graph. Nice looking btw.

5th May 2009, 02:00 PM	#4
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	My speakers configuration is similar to yours, ie 10" alnico woofer B&C De250 compression driver RCF H100 horn all housed in a 70l bass reflex cabinet I was able to get fairly flat too, sounds very good as well, open and dynamic. A worthwhile exercise. I am currently designing and building another system(open baffle), trying to make the sound better than above system. Happy listening.

5th May 2009, 03:32 PM	#7
qquickk diyAudio Member Join Date: Jan 2009 Location: Illinois	Is that a coated paper cone? Great extension for 80l.

6th May 2009, 03:32 AM	#8
winslow diyAudio Member Join Date: Aug 2005	Nice compression drivers. I have a set of the neo motored versions and find them to sound very good.

6th May 2009, 06:15 AM	#10
BHTX diyAudio Member Join Date: Feb 2006	I was just kidding btw, kinda being a smart ***. Looks very nice.

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