Audio Technology 4H52

serengetiplains · 7th January 2006, 09:38 PM

Attached is the published frequency response of the Audio Technology 4" mid-bass unit. I'm wanting to build a pair of MTM speakers using this driver and am wondering if I might get away with running the AT drivers without a crossover. The break-up hump at 13KHz (which might be called a suck-out at 11-13KHz) is 28dB down. Any thoughts whether this would be audible? I can of course, and will, simply experiment, but would appreciate if anyone has relevant experience to share.

Peter Daniel · 7th January 2006, 09:45 PM

I have 5" units and this is how I drive them (a single cap to the tweeter only). It works fine, but I still didn't find time to change for better tweter and optimize the whole thing: It's been a long time since I built my last set of speakers

I bought recently a pair of Fertins and that should keep me busy for a while

With MTM you may wish to keep crossover point lower, as it doesn't work well if it's too high.

serengetiplains · 7th January 2006, 09:55 PM

Peter, you're an amazing resource! I'll gladly read through the series of posts. Nice looking speakers, by the way.

I'm also wondering about cabinet materials ... might bolt together 1" aluminum plate and finish with something. Do you like your wood cabinets?

Peter Daniel · 7th January 2006, 10:00 PM

Yes, I like solid wood cabinet. It seems to have a very natural sound.

I'm also researching tips for baffle material. I've built once a baffle out of 2" acrylic, but my first listening impression wasn't too good. There was some coloration and I had to use numerous tricks to get rid of it (reinforcing with aluminum angles, adding damping pads and sand filled cavities). It sounded OK later, but I don't think I'll ever use acrylic for loudspeakers.

Just today, I was browsing this site: http://www.audio-resolution.com/zhorn/jordan.html and it seems like aluminum may be quite a good material.

serengetiplains · 7th January 2006, 10:11 PM

I take certain cues from what I see happening in the audio industry generally. One approach to cabinet design I've been following is the brute force approach using heavy aluminum. Check out the DK Designs F7, an astonishing looking speaker, now renamed, or the Krell LAT line.

serengetiplains · 7th January 2006, 10:13 PM

GASP!

ScottG · 8th January 2006, 12:54 AM

I've often wondered what this driver would be like in a back-loaded horn, no low pass as mentioned, with the following super tweeter padded-down via a transformer (perhaps a custom autoformer with a restricted bandwidth from David Slagle) - and no highpass:

http://www.madisound.com/pdf/fostexdrivers/ft96hrev.pdf

I'm sure though that the response off-axis between 2.5-4.5 kHz would suffer, though the power response presence "dip" might be preferable.

serengetiplains · 8th January 2006, 01:47 AM

Scott, the AT 4" + Fostex seem almost made for each other. I imagine the combination would produce state of the art on-axis nearfield listening. "As good as it gets," as Jack Nicholson might put it.

Nemophyle · 8th January 2006, 02:03 AM

good idea to run it full range, bad idea to run it full range in MTM. With comb filtering effects you may get a really horrible sound, and you don't want that from AT drivers

Peter Daniel · 8th January 2006, 02:10 AM

Good point about MTM. I've built numerous speakers in that configuration, but I don't think I will ever do it again.

7th January 2006, 09:45 PM	#2
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	I have 5" units and this is how I drive them (a single cap to the tweeter only). It works fine, but I still didn't find time to change for better tweter and optimize the whole thing: It's been a long time since I built my last set of speakers I bought recently a pair of Fertins and that should keep me busy for a while With MTM you may wish to keep crossover point lower, as it doesn't work well if it's too high. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

7th January 2006, 09:55 PM	#3
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	Peter, you're an amazing resource! I'll gladly read through the series of posts. Nice looking speakers, by the way. I'm also wondering about cabinet materials ... might bolt together 1" aluminum plate and finish with something. Do you like your wood cabinets? __________________ Tom

7th January 2006, 10:00 PM	#4
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Yes, I like solid wood cabinet. It seems to have a very natural sound. I'm also researching tips for baffle material. I've built once a baffle out of 2" acrylic, but my first listening impression wasn't too good. There was some coloration and I had to use numerous tricks to get rid of it (reinforcing with aluminum angles, adding damping pads and sand filled cavities). It sounded OK later, but I don't think I'll ever use acrylic for loudspeakers. Just today, I was browsing this site: http://www.audio-resolution.com/zhorn/jordan.html and it seems like aluminum may be quite a good material. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

7th January 2006, 10:11 PM	#5
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	I take certain cues from what I see happening in the audio industry generally. One approach to cabinet design I've been following is the brute force approach using heavy aluminum. Check out the DK Designs F7, an astonishing looking speaker, now renamed, or the Krell LAT line. __________________ Tom

7th January 2006, 10:13 PM	#6
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	GASP! __________________ Tom


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8th January 2006, 12:54 AM	#7
ScottG diyAudio Member Join Date: Feb 2003 Location: US	I've often wondered what this driver would be like in a back-loaded horn, no low pass as mentioned, with the following super tweeter padded-down via a transformer (perhaps a custom autoformer with a restricted bandwidth from David Slagle) - and no highpass: http://www.madisound.com/pdf/fostexdrivers/ft96hrev.pdf I'm sure though that the response off-axis between 2.5-4.5 kHz would suffer, though the power response presence "dip" might be preferable. __________________ perspective is everything

8th January 2006, 01:47 AM	#8
serengetiplains diyAudio Member Join Date: Feb 2004 Location: Canada	Scott, the AT 4" + Fostex seem almost made for each other. I imagine the combination would produce state of the art on-axis nearfield listening. "As good as it gets," as Jack Nicholson might put it. __________________ Tom

8th January 2006, 02:03 AM	#9
Nemophyle diyAudio Member Join Date: Sep 2004 Location: paris	good idea to run it full range, bad idea to run it full range in MTM. With comb filtering effects you may get a really horrible sound, and you don't want that from AT drivers

8th January 2006, 02:10 AM	#10
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Good point about MTM. I've built numerous speakers in that configuration, but I don't think I will ever do it again. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

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