Home » Sponsored » Pi Speakers » Horn loaded Corona Build
Re: Horn loaded Corona Build [message #92020 is a reply to message #92019] Fri, 05 June 2020 07:36 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 554
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
Have a ball building. Like I'd first mentioned, making your own hifi from great designers gives the best satisfaction possible. You'll of course show us what you did.
Re: Horn loaded Corona Build [message #92021 is a reply to message #92020] Fri, 05 June 2020 16:59 Go to previous messageGo to next message
Barryso is currently offline  Barryso
Messages: 142
Registered: May 2009
Master
Nelson Pass has, in several interviews, said that the DIY crowd is cheap and the happiest of all the audiophiles he knows.

It's the second part that's important.

Smile
Re: Horn loaded Corona Build [message #93737 is a reply to message #92021] Wed, 12 May 2021 08:48 Go to previous messageGo to next message
dawiipgh is currently offline  dawiipgh
Messages: 10
Registered: May 2020
Chancellor
Hey guys!

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It has been a long time but life kind of comes at you from all sides. When lockdown began around March 2020, I knew that I wanted to build a set of large efficient speakers. Four Pi speakers were well reviewed and recommended in a lot of the forums. So, I started poking around and eventually got the plans, crossover, and wave guide from Wayne. Compression drivers from Parts-Express and a set of preowned lightly used JBL2226 woofers from Ebay.

I was unloading several sheets of 3/4" Baltic Birch in May and it started raining so I started unloading faster. Instead of holding the sheets in front of me and walking down the grass hill to the basement entrance, I started walking backwards while sliding the wood on the grass. This shouldn't matter because I was going to true up the factory edge. Anyways, I tripped over my retaining wall and fell backwards with my hand outstretched. I ended up with a compound fracture on my radius at the wrist and a broken ulna at the elbow. So my wife 7.5 months pregnant gets me to the local hospital....

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We arrive and my forearm looks like a sine curve and the bone is sticking out the bottom. The triage doctor takes a look at me and says, this might be above our paygrade here so let's get you downtown to where the real carpenters are. They set the bone that night and, in the morning, I have surgery and get external fixators put in.

This recovery with the external fixators goes on for about 6 weeks, then they remove them and open up my wrist again and screw in some plates and put me in a cast. Summer is gone and we have our second kid!

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Cast comes off and I start physical therapy. I can't lift more than 3-5 pounds with very little grip strength so running a circular saw or a plunge router are last on my list of priorities. I have a buddy come over to help me manage the uncut sheets of wood and we get some rough circular saw cuts done and I decide to invest into a clamping straight edge.

So, I'm feeling better around February March 2021 (about a year from when this all started) and I start making my cuts in the back yard with full snow gear on. I learned a ton about wood working and clamping glued joints and the unruliness of routers.
After the boxes were built, I settled in on the front baffle and went with the recessed woofer and horn. Then I start on the cutouts for the port. It is an uphill battle, but at every point I'm learning more from the forums here and woodworking You Tube videos.

After the baffle is glued in, I complete an electrical hook up and it is so fascinating how much the enclosure shapes the tone and response of the woofer. I opted for a recessed baffle in order to incorporate a fabric grill in the future. I saw a great inspiration from vintage KLH, Klipsch, etc. and from a forum user here: Jensen. I opted for General Finishes Java Gel Stain and I am experimenting with mixing my own shellac and doing a final top coat with Deft spray Lacquer.

I wanted to push to get this done for my Birthday in April. We now have functional and stained speakers. A few punch list items include installing the fiberglass insulation, installing the gaskets around the horn and woofer (shower pan liner), final shellac / sanding / lacquer finishing, and a stand or feet with a 5-10 degree incline. Future projects include two flanking subwoofers. I currently hooked up a 10" subwoofer with a passive radiator which really changes the depth and heft of the sound. I can only imagine what 2 ported 12's or 2 sealed 15's will sound like! The current subwoofer is an Aperion Audio Bravus 10D. It rolls off around 40 Hz but still provides quite the depth of sound.

I am currently driving the speakers with a PS Audio Sprout 100 and even at 50 watts @ 8 ohms (100 watts @ 4 ohm), this system provides concert level SPLs with enough chest slam to have your HOA contact you.

So now we are a family of four who really enjoy Living Room dance parties. I even got on Ebay to pick up a fog machine, DJ Chauvet Kinta FX and a Scorpion dual laser aerial lights. Quarantine really came at us, but I think we are doing just fine.

Thanks to all the forum members and Wayne for all of the guidance and brainpower in this forum.

-David


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Re: Horn loaded Corona Build [message #93738 is a reply to message #93737] Wed, 12 May 2021 09:59 Go to previous messageGo to next message
Rusty is currently offline  Rusty
Messages: 554
Registered: May 2018
Location: Kansas City Missouri
Illuminati (1st Degree)
I think from that ordeal you'll be forever bonded with your 4 Pi's. Bet that smart a bit. Better check your ports after your parties for errant beer soldiers left there. Nice work. I like the proverbial monkey coffin shape of the Pi 4. Those skinny tower speakers are sissy in comparison
Re: Horn loaded Corona Build [message #93742 is a reply to message #93738] Wed, 12 May 2021 12:12 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18071
Registered: January 2001
Illuminati (33rd Degree)

Your speakers look great! But - man - what a journey to get them there!

Thanks for the write-up! https://audioroundtable.com/images/thumbs-up.gif
Re: Horn loaded Corona Build [message #93771 is a reply to message #91874] Sat, 15 May 2021 10:31 Go to previous message
Jetpump is currently offline  Jetpump
Messages: 6
Registered: July 2020
Esquire
Nice job with the speakers! It always feels good to build something you appreciate. Sorry to hear about the accident.
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