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Author Topic: Good Mid Bass Horn  (Read 40809 times)

Antone Atmarama Bajor

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Good Mid Bass Horn
« on: May 14, 2006, 05:00:50 PM »

     I was wondering if there are any good hyperbolic midbass horn designs out there that are already optimized for drivers like JBL 2225/2226.  I have the Drivers in vented cabs already, but they are no match SPL wise for My BT7' around Xover.

    I'm not sure that the drivers are actually a good choice for horn loading but I have them so I will use them if I can.  I'm about to Dive into Hornresp.  But I see no sense in reinventing the Wheel.  If there are already Low distortion phase minimals cab designs suitable for the drivers I'd prefer to use the existing design.

    I'm thinking a Low Cut between 60-80Hz and a High cut around 300-600Hz.

    Thanks

Antone-
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Iain_Macdonald

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Re: Good Mid Bass Horn
« Reply #1 on: May 14, 2006, 06:27:23 PM »

Hi,

For the 2225 JBL did the 4550(double)and 4560(single)bins.

http://www.jblpro.com/pages/pub/obsolete/Low_Frequency_Enclo sures1.pdf

Iain.
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Antone Atmarama Bajor

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Re: Good Mid Bass Horn
« Reply #2 on: May 14, 2006, 08:24:07 PM »

Those more of a Reflex horn Hybrid.  Horn for lower mid and a reflex box for bass.  I'm more interested in horn loading down to 80Hz at minimum.  I think they lose horn gain efficiency quickly after 200-300Hz.

    Not very linear.

Thanks though.

Antone-
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Peter Morris

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Re: Good Mid Bass Horn
« Reply #3 on: May 14, 2006, 08:40:46 PM »

http://www.billfitzmaurice.com/DR300.html

These look interesting ... 105 - 110 dB/w/m ??????
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Antone Atmarama Bajor

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Re: Good Mid Bass Horn
« Reply #4 on: May 15, 2006, 05:17:38 AM »

     Bill's stuff looks interesting.

I wasn't planning on building a full range cab though.

    Hmmm.

Antone-
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peter.golde

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Re: Good Mid Bass Horn
« Reply #5 on: May 15, 2006, 11:01:41 AM »

Build one and leave off the HF drivers. The DR300 will do 80 to 300 easily, 80 to 800 easily, the question remains, how well will it integrate with your tops, and  once you get it built and have a listen, would you even want to use your tops? The dispersion of this box is not as wide as the DR280, so you may want two, depending on your aplication, which I think might be one man bass earthquake, with that rig you have Twisted Evil
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Antone Atmarama Bajor

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Re: Good Mid Bass Horn
« Reply #6 on: May 15, 2006, 02:59:54 PM »

I may shell out the cash to check out the plans.

    I've been having some promising results with Horn Resp so I may Build my own.

    It seems that response up to 500Hz is not easy to achieve with a hyperbolic if I want to go down too low though.

    The only problem I have with some of the Bill F. designs is the HF arrays are certainly not conducive to good polar patterns.

Antone-
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Peter Morris

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Re: Good Mid Bass Horn
« Reply #7 on: May 15, 2006, 09:42:31 PM »

I was only suggesting that you use the low section.  If you need to go to 80hz then you will need to fold the horn to keep the size reasonable.  Funktion 1 and KV2 have designs that are similar to what you may be considering:

http://www.kv2audio.com/es_10.html

http://www.funktion-one.com/res4.htm

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Chris Davis

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Re: Good Mid Bass Horn
« Reply #8 on: May 16, 2006, 03:03:22 AM »

The trouble is for effective midbass you really just need a straight horn.  That basically contradicts the type of horn that is most commonly used for bass: a folded horn.  So you end up rolling your folded horn off just below the midbass so it doesn't sound like crap.

Unfortunately it looks like fewer and fewer manufacturers are willing to supply us this type of box and for whatever reason it is I don't care.  Art versus economics is most likely the verdict.  

Almost all manufacturers wish for us to live off a bunch of "full-range" enclosures that can acoustically couple to produce some midbass.  Usually all that's missing in their lines is a proper midbass horn.

Meyer also has a couple.  On their DS-4P the horn is big enough to actually do something and it uses two drivers.  It is effective in the 70-200Hz range.  
Also they have the DS-2P.  I have only seen the documents to this one.  The rolloff is 150Hz instead of 200 and it is a larger enclosure.
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Iain_Macdonald

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Re: Good Mid Bass Horn
« Reply #9 on: May 16, 2006, 11:57:15 AM »

Chris Davis wrote on Tue, 16 May 2006 08:03

The trouble is for effective midbass you really just need a straight horn.  That basically contradicts the type of horn that is most commonly used for bass: a folded horn.  So you end up rolling your folded horn off just below the midbass so it doesn't sound like crap.

Unfortunately it looks like fewer and fewer manufacturers are willing to supply us this type of box and for whatever reason it is I don't care.........


Yes I think you are absolutely correct. That's why I gave the 4550 as a pointer to a possible design solution. EAW and others used to make specific midbass cabinets. I think they sound much better that taking the bass/sub cab up to 300Hz approx. But manufacturers and possibly rental companies want 3 way boxes. If you tried to sell a mass market 4 or 5 way system, I think you would meet resistance.

Iain.

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