Custom Apex C with Wavecor mid and LDW7 woofers - diyAudio
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Old 18th January 2014, 07:20 PM   #1
RAW is offline RAW  Canada
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Location: British Columbia ,Canada
Default Custom Apex C with Wavecor mid and LDW7 woofers

I had a customer contact me about a center channel.With his current main speakers being the Lambda plus line array which use 8 WR125ST plus 6 Aurum Cantus ribbons sitting on top of a pair of 8" woofers.These line arrays I did for Bob and we took to RMAF in 2004.
Bob sold the line arrays and I have been working with the customer to build a center channel..AS I no longer have my wood shop and sold off all my tools in 2009.This means have to re tool for odd jobs.Normally I only do test cabinets, that is all I have time for now adays.But this customer wants me to build the center and match the Sapele veneer on the line arrays.With that I took the challenge but also let the time frame account for limited time I have in the progress.
The Center channel is based on my Apex C which was first designed with Dan Wiggins at Adire with Extremis woofers a pair of WR125S and my ribbon RA104.5 from Aurum Cantus.This center later changed to use the FR125S for mid woofers matched with SDX7 woofers.
Original APEX C in the old Adire show room.
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My old cabinet plan for the Apex C which can be front or rear slot port.If rear slot porting just center the driver layout.I am making many changes to this design from the original, this just gives you a little insight.
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Below you can see the Original Apex C in the front and the line arrays I am speaking of which my customer has purchased from Bob in the back ground

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Side view of the array when I was building them.This photo the veneer I will be applying to the new center channel to match it.
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Drivers used for this project are
RT2 ribbon tweeter New from CSS
2 Wavecor 120 midranges
2LDW7 woofers
Ok the center is in progress cut out for mid woofer 4" ID test boards to make sure of driver fit.:clap:

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3/8" rab bit
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test fit for flushmount
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OK rear view of double thick .75" baffles
round over on the rear right now is only .75" must go get a larger round over bit today
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More to follow
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Old 23rd January 2014, 02:08 AM   #2
RAW is offline RAW  Canada
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A little progress
test fit mid woofer
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test fit tweeter
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rough lay out
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MTM cabinet angled 20 degrees
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MTM cabinet side walls with cut out for rear area open
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braces cut out with 3/16 round over
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Slot port installed on one end install second port on other end also
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brace locations marked out
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MTM cabinet assembly one side to angled piece
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MTM cabinet assembled with both sides
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add braces between MTM cabinet and slot port
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top view of cabinet with all braces and slot ports
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Assembled cabinet compared to PE .5cft cabinet V2 speaker
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Full assembled down for 50-60 hrs of break in before crossover design
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Old 23rd January 2014, 03:43 AM   #3
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Location: Bellevue, WA, USA
Thanks for sharing Al, we are very excited to hear it alongside the Lambdas.
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Old 24th March 2014, 10:09 PM   #4
RAW is offline RAW  Canada
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Join Date: Jul 2002
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Final design 0 to 40 off axis horizontally
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Now for those interested in the VERTICAL response of the this design.
20 and 45 off axis Vertical.With the center channel to be 45 off axis vertical you would have to be standing 2.5 ft in front of the speaker.With this measurement the mic was at the height of 48" off the floor at the 2.5ft distance from the speaker.Another words not at all practical in the real world.
Off axis both vertical and horizontal is very very good response.

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Crossover point

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Old 24th March 2014, 10:25 PM   #5
RAW is offline RAW  Canada
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Join Date: Jul 2002
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Cutting veneer outside on a nice day.

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The back ready for veneer slot ports cut with the terminal plate cut

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Marking center of cabinet with veneer to match grain across the cabinet from the front to the back.The grain will flow across the front top to the back.

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Contact cement I use these rollers with a dollar store tray and roller handle. use it once when doing a long veneer project I place the tray and roller in a bag to keep it from drying out.

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I dry iron my veneer. With this I apply the contact on all pieces of cut veneer then apply the contact to the cabinet side i am working on first.I work from the back to the front.
Once the cabinet is dry 100% as well as the veneer and I mean the contact cement 100% dry.
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I then place and line up the veneer then iron on the veneer from the center out.
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Finished ready for a few days rest then off to get some lacquer.

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Old 30th May 2014, 02:30 AM   #6
RAW is offline RAW  Canada
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Twin slot port out the rear
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All finished just waiting for pick up..

And for those interested this is what the APEX C looked like with SDX7 woofers and FR125S midwoofers.
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Old 30th May 2014, 02:32 AM   #7
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Location: Bellevue, WA, USA
Whoa! Beautiful! Is that one with the SDX7/FR125S mine? Those look pretty cool
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Old 30th May 2014, 02:52 AM   #8
RAW is offline RAW  Canada
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Quote:
Originally Posted by architect7 View Post
Whoa! Beautiful! Is that one with the SDX7/FR125S mine? Those look pretty cool
Nope sorry yours is the other one.
That one is on its way to Sweden for a customer who has my APEX III as mains.This was the last of the FR125S drivers and SDX7 woofers I could find for him.
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Old 15th June 2014, 10:11 AM   #9
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Join Date: Sep 2003
Location: Bellevue, WA, USA
Brought the Apex C II home today, wow it is bigger, heavier and more awesome than I could have ever imagined. We watched The Lego Movie on it after some quick settings changes and wow it sounds good. This thing could be it's own subwoofer for lower level listening! Aimed up it throws a huge image across the screen and fits very well with the towers. I could not be happier with how it turned out and I look forward to having it for years and years to come; this is one of those high end pieces that is passed doen from generation to generation like a McInosh amp or nice watch. Currently biamping it with two bridged channels from a Rotel RB-976 so 150x2/300w RMS total. Now for pics!

With super light MDF magnet grill:
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Naked:
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As you can see, it is WAY too big for the Lovan stand, whoops! Back to the drawing board on that one...
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