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vinylnvalves 23rd December 2012 11:17 AM

Cabinet Design for Altec 414z's
I am wanting to try a different type of bass from my current Onkens for my Altec 414z's. I have looked around the web and there doesn't seem to be that many options suitable for these drivers. I don't want to build a front loaded horn, as i don't have the space, and would like to go to at least 40hz.

I fancied MLTL but discussions on quarterwave suggested the driver isn't suitable. What options are there for these drivers, i experimented with an altec 604 cabinet, but did not get the bass to sound right, sounded like a bad BR alignment.

buzzforb 23rd December 2012 12:01 PM

Will work great in an mltl, just gonna be big. Vas~Vb, Fs~Fb.

vinylnvalves 23rd December 2012 12:42 PM

That wasn't what Mr King said when i looked at TQWT and MLTL and attempted modelling them with this software. (confused -now!!)

buzzforb 23rd December 2012 01:07 PM

GM, a member here, would be helpful in this regard. See if you can get a response. I am not at home, so I can't modl anything, but I have in the past and got good results.

Try GR box of 16x24x39, with driver 7" down and port 38" down. Start with 4 radius and 6" length. This assumes converting port to slot.

vinylnvalves 24th December 2012 12:57 PM

Looking back - it was the TQWT that modelled up poorly.
Reading about MLTL they are bass shy compared with other types, probably cleaner through, i am looking for good LF to keep up with the rest of the setup.
The altec only needs to go upto around 350Hz, where my midbass horn takes over, it will also be active.

Did see this which as an idea could work for me, makes the time alignment easier, front horn/MTLT?? Will also integrate better with the other horns.

Also saw this, which i like ABSOLUTE AUDIO & VISUAL - Jadis OLYMPIA. Claims to go to 110Hz with the WG and the onken below that.

buzzforb 24th December 2012 01:02 PM

Horns will have good midbass, but will be more likely bass shy in lower octaves. First design is very tempting, combining horn and Onken qualities, but unsure of its performance. I don't think the large mltl will be bass shy, being limited mostly by the cone area more than anything.

vinylnvalves 24th December 2012 02:18 PM

I agree that combining a front horn with something else to reinforce the bottom end is an idea i like. You can with the Onken get a peak around 70Hz which gives you a slightly lower F3, maybe the front horn could equilise the response by bringing the midbass up in SPL. Blue thunder is a good example of this, what worries me is what happens below mouth freq response, as with all other horns you cut them within 1.6XFc. What interested me in the Jardis example was how the assysmetric is being used, is this for ground plane effects or just to get a larger mouth

buzzforb 24th December 2012 02:56 PM

With Altec's just expect BIG if you want bass.

If you haven't looked already, Hostboard is great resource for altec.

vinylnvalves 26th December 2012 11:40 AM

Big depends on your perspective!!
My current set up is not exactly small.
A can have a large volume cabinet if it is tall. Give me something to attach the rest of the horns to. As far as i am aware its either a TQWT or something like this which looks like a horn firing into the floor, which meets this requirement.

Positioning of the drivers is also important, want to get them as close together as possible. The limiting feature will be the Beyma TPL which needs to be a "seated ear height", so was going to position everything else around it

buzzforb 27th December 2012 03:03 AM

Suddenly I am jealous. If your willing to mount like that, I have a great idea I wasn't able to get by wife. I am back home now. Will post drawing and results.

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