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Geddes multiple subwoofer method - 3 subs vice 4

Geddes recommends 3 subs for optimal sound - a different perspective

 

Interesting video depicting Geddes philosophy on using subs. Also, he treats the main speakers as part of the bass solution and does not recommend using high pass filters as this takes away from the total bass capabilities of the entire speaker sub interface system. I am going to experiment this weekend. Also, a higher crossover frequency for the first sub collocated closer to the main speakers is new to me. Recommended above 100 hertz for the first sub and then incrementally lower for the 2nd and 3rd sub in an asymmetric pattern. 
 

I feel like the Geddes approach for sub integration closely resembles what I have been doing for years without even knowing this method. So, my 18” deep bass and 15” mid bass drivers on the field coil speakers become part of the solution instead of being taken out of the equation. That’s what I have been doing and that’s what I thought sounded best to me. Multiple ways to do sub integration but this method is the one that pretty mirrors how I have been doing it for years.

audioquest4life
erik_squires
15,772 posts
 

I will always disagree with using the main subs without a high pass filter as being universally better, especially with smaller mains. The distortion produced by smaller woofers in the lowest octaves is measurable and limits the overall dynamic range of the main speaker, ESPECIALLY with ported speakers.  Plugging speakers used with subs can also further dramatically increase the available dynamic range of the mains.

If you are placing 4x12" or larger subs, then I can’t imagine most main speakers have much to contribute, besides distortion.

If all you care about is maximum bass dynamic range, with no thoughts given to distortion, I guess Geddes is correct. If you care about the entire dynamic range envelope then a high pass on the mains may be just the thing.

audioquest4life OP
722 posts
 

"I will always disagree with using the main subs without a high pass filter as being universally better, especially with smaller mains."

That may be true for small speakers. I guess my giant mains with aforementioned 18" and 15" bass drivers don’t fall in your small speaker category, so I am safe from ridicule for using the Geddes method. Diversity of thought is such a valuable thing to embrace. Not many people get it.

 

erik_squires
15,772 posts
 

OP:  Indeed, if you have main speakers which can keep up in terms of dynamic range and distortion in the lowest octaves no reason to high pass them, unless of course you wanted to try listening with low powered amps! :)

 

Ag insider logo xs@2x
rauliruegas
12,823 posts
 

Dear @audioquest4life :  ​​​@erik_squires is rigth even with bigger speakers than monitors smaller ones and I disagree with Geddes.

 

In the other side you are doing nothing new and nothing as what Geddes says because you are talking of what speaker manufacturers do: midrange, mid bass and bass no matters wich kind of drivers they use in their speaker designs ( field coil or not ). It depends what the manufacturer is looking for and at which market price he wants to offer.

 

R.

R.

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