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Old 31st October 2007, 10:43 PM   #1
KMMM is offline KMMM  Norway
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Default Adding a tweeter to DX3?

Hi!

I have been spending all night searching this forum, but I have not found a simple answer to my (probably) stupid question.
If there's a post I have been missing about the subject please let me know.

After building MJK's MLTL with The DX3 I have been really satisfied. This is a nice speaker!!
It's also got OK WAF... So until I get a bigger house I'll have to consider this. As well
But as always I have to see if I can bring a bit more sweetness from the music.
I'm building a 12" active sub and while I'm at it, I was thinking of adding a tweeter.
I'm quite satisfied with the woodwork – so it'll have to be an ad-on tweeter.
I'm not an experienced DIY-er so I need a bit of help here...

Have been looking at:
Visaton Horn tweeter TL 16 H 8 OHM
LCY 100K
Aurum Cantus G2
Raven R 1.1

Any how: Has any one tried to ad a tweeter to this particular design?
What are the experiences? What would be the best crossover –and does any one think that any of the tweeters mentioned above would do the job?

Any thoughts would be really appreciated
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Old 31st October 2007, 11:09 PM   #2
MJK is offline MJK  United States
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Thanks for the positive feedback on the ML TL design. The DX3 is a very good driver for that enclosure.

I have been using a Fostex FT17H super tweeter on top of my Lowther PM2A OB speakers (I need to add a picture and update the page on my site). I tried a few small capacitors in series with the tweeter to form the 6 dB/octave crossover, I settled on either a 1 uF or a 2 uF value (I don't remember exactly which one). The Lowther runs full range with no crossover. The tweeter adds just a little air to the very top end.

The tweeter is mounted in a small "L" shaped wood frame about 4" by 4" by 4" deep which just sits on top of the larger speaker. It can be moved left or right and front to back to find a good spot. Basically I piggy backed the positive and negative leads for the tweeter right off of the Lowther's binding posts. Tried different values of the capacitor between 1 uF and 3 uF and stuck with the one that sounded best. Inexpensive, but it did the trick.
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Old 31st October 2007, 11:33 PM   #3
ttan98 is offline ttan98  Australia
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Default Using super tweeter on full range

It seems some users do NOT believe in using super tweeter on full range.

I have tried using Motorola piezo(el' cheapo tweeter), it seems to work quite well on my FE167E fostex, via 1uF and 8-15 ohm(Fostex FT may not need this) in parallel with piezo as termination.

since fostex FT is reasonably priced and easily removable, there is no harm trying.

hope this may shed some light....cheers.
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Old 1st November 2007, 04:00 AM   #4
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Horns tend to do best in this kind of application because their dispersion at XO is better matched to that of the top end of the Lowther.

dave
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Old 1st November 2007, 10:56 AM   #5
KMMM is offline KMMM  Norway
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Thank you for your replies!

MJK:
The Fostex FT17H Looks interesting. A lot cheaper then the ones I've been looking at. Good!!
Would this do the job on the MLTL as well?
What capacitor would you recommend using here. (I use 10 ohm in the filter)
Where would you hook it up? before or after the correction filter?

Is there any other tweeters that would do the job as well?

Best regards
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Old 1st November 2007, 11:25 AM   #6
AndrewT is offline AndrewT  Scotland
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Hardly a serious proposal, more just a collection of thoughts.
The full rangers get critised for various quality artefacts.
Could this be down to asking too much of the driver?
These full rangers are excellent.
What if you eased it's duty by removing the tweeter cone and get a touch more efficiency. Roll off the Hi treble (8 to 10kHz) and add your super tweeter. Now it's a wide range mid driver and could be even better than excellent.

Non reversible if it doesn't work.

Your bass proposal has already addressed the lower end problem.
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Old 1st November 2007, 03:34 PM   #7
KMMM is offline KMMM  Norway
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Hi
Interesting, but I think I'll leave the Lowthers alone...

Just ordered the Fostex FT17H from BD Design in the Netherlands.
I'll give them a try.

Still need input on the capacitators though...

Best regards
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Old 1st November 2007, 04:04 PM   #8
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http://www.zillaspeak.com/Crossover.asp

I would try 1.47uf down to 1uf. This will produce a nice 6db slope to blend with your Lowther.

Godzilla
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Old 1st November 2007, 07:57 PM   #9
felixx is offline felixx  Romania
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I use on my open baffle Fostex T925A,alnico motor with a 2uf cap to Supravox top mounted.
You could compare DX3 responce with Supravox rtf64 bicone.

http://www.diyaudio.com/forums/showt...02#post1194102

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Old 1st November 2007, 09:04 PM   #10
KMMM is offline KMMM  Norway
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Thanks godzilla,
Do you all think it would be wice to dampen the Fostex a couple of dB as well?
Just been looking at Martin's frequensy response diagram.
As far as I can figuer, the Lowthers are quite flat around 95dB and it has a bump arround 7k to 15k in this design. While the Fostexs are flat arround 100dB from 6k and up.
Would it be a good idea to put lets say a Cap 1.33uF in series and then one 2,7 ohm resistor in series and a 6,8 ohm in paralell? I think this would dampen the fostex with about 5dB?? But would it be wice?
I know. I could try it out, but it's nice to get an opinion from you guys before I go a head and order. And I'm really a novice here

Kaare
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