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Larger Cabinet for Heresy


tagger

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I am planning to build new cabinets for my Heresy I's, whose cabinets were heavily damaged in my recent basement flood.  I figured since I'm building from scratch, perhaps I could make some design improvements (for my particular room).  I understand the existing cabinet is smaller than ideal, and sacrifices some bass response that the K-22 could otherwise achieve.  Does anyone know the ideal cabinet size for the K-22, based on T/S parameters?

 

For those interested, I also plan to use a slightly slanted motorboard, and swap the K-700 horns for Selenium HM25-25's.  Any comments on these ideas are also welcome!  EDIT:  The HM25-25 horns are out -- their minimum frequency is 1,200 Hz, too high for a Heresy squawker.

Edited by tagger
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I am just thinking aloud here, I wonder if it would be beneficial to add a passive radiator on the rear of the new cabinets. It might bring you into the Forte range of bass by that simple addition.

Edited by teaman
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I owned a pair of Forte II's about 5 years ago, and sold them after I built a pair of Cornscalas (or is it Alcorns...).  I should have kept them as backups!  The Heresies I'm using in my basement as part of a 5.2 surround setup with three Heresies up front.  While I agree that the Fortes would pretty much give me what the Heresies give me but with deeper bass, I like having three identical speakers up front, and a Forte center channel is just too tall.  The Heresy center is short enough to leave at least a couple inches between it and the bottom of my projection screen.

 

So, does anyone know what a more ideal cabinet volume for the Heresy would be?

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They are Tangent 400 speakers. Exact same components as Heresy II, including the crossover, in a taller ported cabinet. A good friend of mine has a psir of them snd they have way more bass. Plus, they get the mids and tweets closer to ear level.

Bruce

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The OP has a damaged pair of Heresy's with good drivers and most of you guys are telling him to buy something else. He has nothing to lose by building new cabinets and a lot to gain if he gets the numbers right. I'm looking forward to seeing how this turns out. Please post pics!

 

BillWojo

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I pulled the components and all appear unharmed.  The water damage to the cabinets was due to sitting in three inches of water for a day.  I suppose once dried they wouldn't have been functionally worse for wear, but since they were already in pretty shoddy condition anyway I figured why not take this opportunity to build brand new cabinets and possibly make some improvements.

 

I found these Thiele/Small parameters for the K22E:

 

Fs=33hz
Qms=4.61
Vas=6.02 cu ft
X-max=3.91mm
Sd=86 sq in
Qts=.351
No=1.55%
SPL=94.8dB/2.83V/1M
Qes=.38
Re=6.8
Le=1mH (not sure of this)
Z=8 ohms
Bl=15
Pe=100W

Edited by tagger
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"

 

Fs=33hz
Qms=4.61
Vas=6.02 cu ft
X-max=3.91mm
Sd=86 sq in
Qts=.351
No=1.55%
SPL=94.8dB/2.83V/1M
Qes=.38
Re=6.8
Le=1mH (not sure of this)
Z=8 ohms
Bl=15
Pe=100W

 

"

 

I used these parameters years ago to build a 5,000 cu in box tuned to 33hz, or 10,000 cu in for two.

 

Used with a Q=2 high-pass filter at 33hz they sounded incredible.

 

I used an Atlas PD4V on an Electro-Voice 8HD horn, and the same Motorola KSN1016A tweeter Klipsch used in the MCM1900 five-tweeter array.

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Thaddeus, I am fairly new here. What has that got to do with the OP question. I see an intelligent question asked and folks are telling him not to bother. From the research that I have been able to find, one of the reasons the Heresy's lack a lot of low end grunt is the smaller cabinet size. I have Heresy's and wonder if a larger cabinet wouldn't help the bass myself. Remember, this speaker was designed as a center fill channel. LaScalas , Khorns, etc were to provide the bass.

djk seems to have provided a thoughtful answer.

Thanks

 

BillWojo

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DJK, do you remember what your port dimensions were for the 5,000 cu in box?

 

From what I gather the Tangent 400's are approximately 5400 cu in with two ports that are 3 in diameter and 5 in long each. 

 

What software are most folks here using for speaker cabinet design?

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I did something similar with my KG4's. In my avitar is one of the towers and the center. I put the drivers and crossover into a four ft tower and eliminated the passive on the rear for a smaller footprint. Sine it is set up in a HT setting the Sub pulls the bottom end for me and the KG4 drivers sound awesome set up in a tower. I would think the Heresy would do well in a taller cabinet as well. No use in buying new speakers when you already have drivers.

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DJK, do you remember what your port dimensions were for the 5,000 cu in box?

 

From what I gather the Tangent 400's are approximately 5400 cu in with two ports that are 3 in diameter and 5 in long each. 

 

What software are most folks here using for speaker cabinet design?

 

If your wanting approx the same tune on a 5 cuft box it would be around 42hz, 2 3" X 5.5 will get you there. That is approx what your 5" long ports get you in the 5.4 Cuft box if you take off about .3 displacement for drivers etc. Might be more but just throwing it out there.

WinISD is a good free program to use.

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