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Old 25th May 2010, 05:39 PM   #1
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Default mcm 8" dual tapped horn plan

Does anyone have a dual mcm 8" tapped horn plan that I can get for a car. pleaseeeeeeeeeeeeeeeeeeeeeeeeeee
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Old 25th May 2010, 06:54 PM   #2
jbell is offline jbell  United States
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unfortunately with the cabin gain of a car, tapped horns don't really do all that well... At least if what you are interested in, is having the sub response smoothly roll off, at the same rate the cabin gain is adding in.

However, if you have a typical sedan and can port the subs through the rear deck, and can eq your bass -- I have thought for you.

Reed Exodus Anarchy 25hz Tapped Horn - AVS Forum.

Build single driver cabinets at 8.25" interior dimension for your mcm's. Lose the last fold (20 1/8" by 23 3/16" cabinet size), and from where the driver is, continue the flair straight on up and through your rear deck. At 20" wide, you should be able to get a pair of them side by side, so you'd end up with about 40" wide, by however tall to your deck by 9.25 deep. That would prevent you from taking up your entire trunk space, and give you what I think you are asking for, and with some nice grill on your deck, and carpet to hide the cabinets in the trunk-- stealth.

I ran the hornresp sim for that, and while not perfect, it works.
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Last edited by jbell; 25th May 2010 at 07:00 PM.
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Old 25th May 2010, 07:26 PM   #3
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do not understand but thank you anyway. I will read it over and over until i get it
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Old 25th May 2010, 08:00 PM   #4
jbell is offline jbell  United States
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what kind of car do you have? that bit of info would help.
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Old 25th May 2010, 08:19 PM   #5
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1991 nissan max
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Old 25th May 2010, 08:39 PM   #6
jbell is offline jbell  United States
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I think my suggestion will work.
Measure the wheelwell to wheelwell dimension (needs to be 40" min)
Measure the floor to deck lid (needs to be 23" min)

If you look at the picture I quickly clipped together, it'll make sense. If you take the dimension sheet lilmike has, and change all of the 7.25" dimensions to 8.25", then I think that will also help make some sense.
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Old 25th May 2010, 08:49 PM   #7
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OK,thanks
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Old 25th May 2010, 10:03 PM   #8
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jbell's "Anarchy" suggestion is good.

I tend to disagree with his suggestion that tapped horns don't go well with cabin gain. It's no harder to design a tapped horn to have a response suitable for car use than it is to design a bass reflex for the same use. No EQ required, either. (For example, the later incarnations of Mark K's Unhorn.)
I aim for "eva's response": In half space (2 pi?), flat down to 80 Hz, -3dB at 60 Hz, 12 db/octave slope down to 30 Hz, then 24 dB/octave below 30 Hz with optional 30 Hz high-pass. It requires minimum additional EQ in the couple of cars I have tried it in - a small sedan and a small SUV. If I get time I'll post some designs in a new thread.
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Old 26th May 2010, 12:04 AM   #9
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Quote:
Originally Posted by Don Hills View Post
jbell's "Anarchy" suggestion is good.

I tend to disagree with his suggestion that tapped horns don't go well with cabin gain. It's no harder to design a tapped horn to have a response suitable for car use than it is to design a bass reflex for the same use. No EQ required, either. (For example, the later incarnations of Mark K's Unhorn.)
I aim for "eva's response": In half space (2 pi?), flat down to 80 Hz, -3dB at 60 Hz, 12 db/octave slope down to 30 Hz, then 24 dB/octave below 30 Hz with optional 30 Hz high-pass. It requires minimum additional EQ in the couple of cars I have tried it in - a small sedan and a small SUV. If I get time I'll post some designs in a new thread.
Agree I found that a 33hz tuned EBS with 2226 worked well people often say the same of small rooms'oh that wont work the wavelengths wont fit!' or horns wont work in a car. I think one or two people model a TH in 0.5pi put it in a car and maybe slightly underwhelmed depending on how leaky the car is.
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Old 26th May 2010, 06:17 AM   #10
fredk1 is offline fredk1  Canada
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Wouldn't a front loaded horn with its more gradual roll off work better in a car? I modeled the Anarchy as both a tapped horn and front loaded as I have one of these I would eventually like to put in my car.

While I could get a little roll off in a tapped horn, the front loaded design seemed to match cabin gain in a car much better. I am no expert with hornresp or horn sub design though.
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