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Smaller 3 pi construction? [message #93247] Fri, 05 March 2021 03:13 Go to next message
stereojan is currently offline  stereojan
Messages: 4
Registered: February 2021
Esquire
Hi!

I am thinking about building a couple of speakers for the living room. My preference would be the 4 pi, but they are a too big for wife acceptance.

The compromise is to build a smaller 2-way speaker designed like the Klipsch Heresy III (24" x 16" x 13.5", tilted). I am thinking 12" woofer with waveguide tweeters. And maybe add two flanking subs in the corners next to speakers (perhaps used as speaker stands when wife is away).

Is it possible to reduce the size of the 3 pi to fit the the specs?
I guess I will lose some bass extension, but maybe subs will compensate enough.


Cheers.
Re: Smaller 3 pi construction? [message #93248 is a reply to message #93247] Fri, 05 March 2021 08:34 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

Of course, a loudspeaker like you've described could be designed and I would expect it to be great, if done properly.

But don't modify the cabinet dimensions without acoustic testing, and specifically pay attention to the lower midrange. That's what is most problematic in cabinet design for a large-format two-way loudspeaker.

Also, bear in mind that another one of the things that will change is the baffle step region. As the baffle shrinks, the baffle step happens higher in frequency. The three Pi and four Pi models are large enough that baffle step is around the frequency where the flanking subs rolloff. So they provide extension, SBIR and higher-frequency room mode mitigation and baffle step correction.

More information about these issues and others can be found in the Pi Speakers FAQ.
Re: Smaller 3 pi construction? [message #93257 is a reply to message #93247] Sun, 07 March 2021 03:11 Go to previous messageGo to next message
stereojan is currently offline  stereojan
Messages: 4
Registered: February 2021
Esquire
Thanks for the reply and the additional tips Smile

Seems like I have to get into some acoustic testing too. May be some of the econowave variants is an easier place to start from since I am kind of a newbie in this. The size of those designs fit my size requirements quite well it seems. I understand those design were based on your Pi speakers. But maybe not as refined as your designs.

What do you think is the easiest starting point?
Re: Smaller 3 pi construction? [message #93259 is a reply to message #93257] Sun, 07 March 2021 08:56 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

Econowave guys are definitely kindred spirits. You could certainly root-around on the Econowave thread and find something that suits your needs.
Re: Smaller 3 pi construction? [message #93407 is a reply to message #93247] Wed, 31 March 2021 08:16 Go to previous messageGo to next message
stereojan is currently offline  stereojan
Messages: 4
Registered: February 2021
Esquire
After some research I've decided to start out with the 3Pi kit, and try to measure and adjust the crossover to the smaller box/baffle size. Or maybe just add some simple digital corrections with the Minidsp shd streamer/dsp/dac.

I think I will go for the B&C tweeter. Not sure yet which woofer. The B&C woofer seems maybe to do better in a smaller box (+ higher sensitvity?). Any opinions on which is the better choice?

Re: Smaller 3 pi construction? [message #93408 is a reply to message #93407] Wed, 31 March 2021 08:40 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18031
Registered: January 2001
Illuminati (33rd Degree)

The B&C 12PLB100 is the highest-quality option. I'd go with that. https://audioroundtable.com/images/thumbs-up.gif
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