Home » Sponsored » Pi Speakers » 3 Pi sub questions
3 Pi sub questions [message #91304] Sat, 04 January 2020 23:52 Go to next message
OneBean is currently offline  OneBean
Messages: 37
Registered: May 2009
Baron
I have been wanting to build new subs for my home theater. My current subs are in large ported cabinets, and the drivers are not very robust. The 3 Pi sub looks like a nice size, and appears to play deep and loud, with a robust driver. I have a Sony home theater receiver that has a single RCA sub out, and offers built in room correction, by using a microphone to listen to the rooms and make adjustments. Currently, the single RCA sub out goes to a Crown PA amp capable of delivering around 600 watts per channel into 4 ohms with a high dampening factor (over 1000 at 100 Hz if I remember correctly). Is 600 watts enough for 2- 8 ohm Lab12's in parallel?

If I added 2- 3 Pi subs flanking the right and left main speakers, and then added 2 more 3 Pi subs in the corners of the room, how would I attach these 4 subs to my equipment?

Do the subs have built in cross overs, so they don't need individual active crossovers?

Is there a risk of phase cancelation with all those subs placed around the room? Most subs from manufacturers have a phase switch or knob to get the phase right.

What is included in the kit?

I'm guessing 4- 3 Pi subs in my room (approximately 30' wide x 18' deep) would recreate explosions very nice if implemented correctly. Is anyone here running 4 of these in a home theater?

Onebean
Re: 3 Pi sub questions [message #91306 is a reply to message #91304] Mon, 06 January 2020 08:59 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18723
Registered: January 2001
Illuminati (33rd Degree)

The three Pi sub kit is really just a woofer and port material. We also include the connector panel, a "π" logo and a printed copy of the plans. There is no passive crossover included.

The crossover, as you've rightly indicated, is specific to the application. Flanking subs use a different crossover than distributed multisubs. And those are different than a traditional single sub application, which I do not recommend, by the way.

There are many suitable crossovers and amps you can use. The simplest would be to mount a plate amp to the back of the box. But most plate amps have limited crossover options. You can also use a separate amp with MiniDSP, which would allow you a great deal of flexibility for crossover filters. Flanking subs use a 100Hz second-order Butterworth filter, which is a one-click setting in MiniDSP. Distributed multisubs can usually be run from the LFE channel.

More about multisubs and flanking subs at the link below:
Re: 3 Pi sub questions [message #91309 is a reply to message #91304] Mon, 06 January 2020 21:45 Go to previous messageGo to next message
OneBean is currently offline  OneBean
Messages: 37
Registered: May 2009
Baron
Wayne, thank you for the reply, I'm reading through all the FAQ's. Please send the plans for the 3 Pi subs, and 2 Pi bass reflex speakers.
Re: 3 Pi sub questions [message #91314 is a reply to message #91309] Tue, 07 January 2020 09:08 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18723
Registered: January 2001
Illuminati (33rd Degree)

You've got mail!
Re: 3 Pi sub questions [message #91319 is a reply to message #91314] Tue, 07 January 2020 11:03 Go to previous messageGo to next message
OneBean is currently offline  OneBean
Messages: 37
Registered: May 2009
Baron
Thank you!
Re: 3 Pi sub questions [message #91321 is a reply to message #91304] Wed, 08 January 2020 08:04 Go to previous messageGo to next message
OneBean is currently offline  OneBean
Messages: 37
Registered: May 2009
Baron
Wayne, on the 3 Pi sub enclosure, is there any internal bracing needed?
Re: 3 Pi sub questions [message #91322 is a reply to message #91321] Wed, 08 January 2020 08:55 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18723
Registered: January 2001
Illuminati (33rd Degree)

No bracing needed. Panel resonances are way outside the passband. No need for insulation as damping material either, for a similar reason. The internal standing waves are also far above the passband.
Previous Topic: PI 2
Next Topic: Constant directivity cornerhorn plan request
Goto Forum:
  


Current Time: Sun Jul 14 16:37:33 CDT 2024

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Miller Audio
Miller Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest