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eminence delta 12 lfa

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Category: Plans
Forum Name: Plan Requests
Forum Description: All plan requests here
URL: https://forum.speakerplans.com/forum_posts.asp?TID=81937
Printed Date: 28 March 2024 at 1:23pm
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Topic: eminence delta 12 lfa
Posted By: Ras_B
Subject: eminence delta 12 lfa
Date Posted: 12 September 2013 at 8:50am
I was given two eminence delta 12 lfa and was thinking of using them for my mobile disco company as bass what box would you recommend? Something ported, sealed or taped horn like the mth-30

Thanks



Replies:
Posted By: bitSmasher
Date Posted: 13 September 2013 at 2:47am
Ported... I have a few D12LFA and that seems the best option... 70-90 litre box, tuned to 60ish
I considered Cubo but the designer suggested these drivers won't go too low in a Cubo12.

Just this week i looked at the Bootybass by DaveyT, but interestingly the Hornresp sims show no real benefit over ported. Will post some pics tomorrow showing what I've come up with.

An option could be the JBell SS15, modded to suit. I tried this, was fairly impressive for a battery powered system but a bit too big for my liking.

(reply copied from previous thread)


Posted By: bitSmasher
Date Posted: 13 September 2013 at 3:15am
OK, I'm pretty new to box design so posting this as a way to have my own work checked over - hopefully it helps you too

my needs are a relatively compact and efficient box, usable from 60hz up, for a portable battery powered system. Only putting 100W max in to it, so not pushing the driver too hard...

both WinISD and HornResp are showing me that a 75L reflex box, tuned to 60ish, give impressive results for the size:



Posted By: bitSmasher
Date Posted: 13 September 2013 at 3:19am
An option I considered is Davey T's Bootybass, originally designed for Fane 15"
Original thread here, plans on page 2
http://forum.speakerplans.com/davey-ts-215-bootybass-with-plans_topic27642_page1.html" rel="nofollow - http://forum.speakerplans.com/davey-ts-215-bootybass-with-plans_topic27642_page1.html









Posted By: bitSmasher
Date Posted: 13 September 2013 at 3:20am
Here's the D12LFA swapped in, but I haven't changed any of the box dimensions (including ATc) as I am not well versed in HornResp yet. Hopefully someone can poke their head in and comment on this:




Posted By: bitSmasher
Date Posted: 13 September 2013 at 3:21am
Finally, worth noting that the Bootybass is 2 drivers in parallel, sims at 2v
To be fair to the reflex, here's a comparison of 2 boxes in parallel at 2v
(again, I hope I'm doing this right)




Posted By: bitSmasher
Date Posted: 13 September 2013 at 3:30am
Sorry for the multiple posts, but it makes easier when quoting a single image..

anyway, what I'd like verified is - are my hornresp sims valid?
And, besides a marginal (1db) increase using the Bootybass design, what other benefits could we expect from a more complex hybrid horn compared to reflex?
Especially when stacking 3+ boxes, I'd hope there are some gains in this situation

It's possible that I'm overlooking details, but also possible that the D12LFA is best suited to reflex with no real gains from such designs - especially taking in to account a 50% increase in box size, more weight and more complex build (relatively, the BB looks pretty easy!).

Hope to get some input on this Wink


Posted By: mobiele eenheid
Date Posted: 13 September 2013 at 3:46am
I've never thoughed Hornresp gives a real comparison between reflex and hybrid. If I would only have the simulations for comparison, I would never have build the Cubo series because the simulated margin for hybrid over reflex is pityfull. Every prototype build shows a more optimistic story.
 
Best regards Johan


Posted By: bitSmasher
Date Posted: 13 September 2013 at 4:22am
fair enough, I'm very much in the early stages of learning... the Cubo12 sims put me off a bit - the mountain north of 100hz combined with the designer saying a Delta12LF won't have "low bass" response (not sure what that means)
I guess building a few test boxes is the only way to find out


Posted By: mobiele eenheid
Date Posted: 13 September 2013 at 11:25pm
A typical response for a medium or low Qts driver is a flattish response down to Fc low and than a 18 - 24 dB/octave roll off. A high Qts driver will behave like Hornresp usually shows, Fc low will be 5 - 10 Hz higher than a low Qts driver but the roll off is usually less steep, sometimes with a small bump around Fc low. This will likely result in less ~50 Hz output rest equal.
 
I know some happy Cubo 12 users that have a Delta 12LFA in there. For the price it's a good one. IIRC the Booty bass goes 5 Hz lower at the expense of output.
 
edit - One user: http://www.diyaudio.com/forums/subwoofers/179479-cube-horn-design-3.html#post2426677" rel="nofollow - http://www.diyaudio.com/forums/subwoofers/179479-cube-horn-design-3.html#post2426677    An other one I know personally - edit
 
Best regards
 
Cubo
 


Posted By: Ras_B
Date Posted: 14 September 2013 at 11:04am
By thw sounds of it the cubo would be a good build do you know where I can get the box design from thanks


Posted By: bitSmasher
Date Posted: 16 September 2013 at 7:08am
Thanks for your input Johan, didn't mean to be flippant with my mention of sims and their relevance - I tried joining FSP a few times a while ago but gave up, but have read through the threads there things are making more sense - really do appreciate your work with design and subsequent support of these boxes Thumbs Up

Do you have links to users running D12LFA in their Cubo? Would be interested to see their uses...
That said, if you're confident in saying from 60hz up it'll show higher output than a reflex as above, I'm pretty much sold on it!

Ras_B, plans are here: http://freespeakerplans.com/bass-cabinets/14-cubo-12" rel="nofollow - http://freespeakerplans.com/bass-cabinets/14-cubo-12


Posted By: bitSmasher
Date Posted: 19 September 2013 at 7:00am
Originally posted by mobiele eenheid mobiele eenheid wrote:

IIRC the Booty bass goes 5 Hz lower at the expense of output

Hmmmm looks like a fair statement, I took Hornresp input from MartinS  http://www.freespeakerplans.com/forum/38-hosted-plans/9048-cubo-12?start=80#13780" rel="nofollow - posted here on FSP , and substituted my driver...


Looks OK, narrower passband but higher output.

To be fair to the Bootybass comparison above, again 2 boxes in parallel at 2v:


Will be interested to see what bass response is like in the real world... getting itchy to make sawdust Wink


Posted By: Ras_B
Date Posted: 19 September 2013 at 7:29am
The plans for the cubo12 over on freespeakerplan are in mm arnt they??


Posted By: mobiele eenheid
Date Posted: 19 September 2013 at 3:35pm
@Ras_B: The construction plans are in mm, the cut sheet is in cm.
 
@Bitsmasher: I've added a link in my previous post.
 
Best regards Johan


Posted By: Ras_B
Date Posted: 19 September 2013 at 11:29pm
Thanks



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