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Old 10th December 2008, 08:51 PM   #1
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Question Dallas II + 208E = ?

Hi all,

I'm in the middle of building Ron's Dallas II horns for the FE-206E.
I have already bought all the wood and it's cut to boards. I still haven't ordered the 206E's.

Yesterday I found a deal to buy a pair of newer used 208E + T90a tweeters.

So, my question is: What modifications would be necessary for Dallas II to best accommodate 208E?

Your thoughts on how would the 208+t90+dallas combo sound?
I have found this quote from Ron on the forum

Quote:
i had the Fountek with my 208s in the old original Dallas. Excellent combo.
Ron your further input on this issue would be greatly appreciated.

All and any ideas about this combo would be helpful.
Crossover freq for the tweet ? I was thinking a cap and a L-pad and freq. of about 10kHz . Suggested values for these?
Placement of the tweeter?
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Old 11th December 2008, 01:37 PM   #2
REC1 is offline REC1  United States
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All and any ideas about this combo would be helpful.
Crossover freq for the tweet ? I was thinking a cap and a L-pad and freq. of about 10kHz . Suggested values for these?
Placement of the tweeter?


Never worked with the T90. I used a ribbon and just a cap. Dont remember the value, but any 2way XO calculator will work. Yep i XOed at 10Khz. Sorry but all the components are in a box on the bottom of a buncha boxes in my spare bedroom (aka junk room). One of the MAJOR problems of ppl building the DallasII is they dont recognize the importance of a TOTAL airtight seal of the driver to the baffle. One builder of the DallasIII did a really beautiful job on the cabs, then had the speaker wires running out the driver hole with NO sealent whatsoever????????
Then builders complain about lack of bass.

ron
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Old 11th December 2008, 03:32 PM   #3
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Ron, thanks for your reply.

I'll make sure everything is airtight.

So no modifications to the design necessary for the 208 ?

Isn't only a cap on a tweeter a first order crossover? Why use a 2nd order calculator ?

Any comments on difference in sound quality 206 vs. 208 ?
208 are double the price of 206 and they need a tweeter. Your thoughts is this a worthy upgrade ?
Has anybody directly compared 206 to 208 in the same BLH?
Phase plugs in 208? I've seen 208 don't have a regular dustcap, do they benefit from phase plugs ?

BTW Do you know for what wood thickness are plans on planet10's site for?
I started laying the design down on the side panel, and noticed that the plans assume a different thickness. I'm using 18mm ply, and as that is the preferred size of ply, I thought that the plans would be for that size too.
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Old 11th December 2008, 04:07 PM   #4
REC1 is offline REC1  United States
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Its a first order XO, i just used an online program for a 2way. Disregard the coil parameters, just use cap value.

208 has greater detail and smoothness,the 206 i found to have a harsh top end even with phase plugs.

18mm is the designed thickness.

ron
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Old 11th December 2008, 08:08 PM   #5
adamt is offline adamt  Australia
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I have the Fe208e sigma and T90a combination in a D-58es horn. I have played around with the crossover and found one capacitor of 1.0uF is the best. no need for an L pad, just wire it direct.

I have compared the fe206e and fe208e sigma and they are chalk and cheese. here are my thoughts:
1. 206 is exciting, but fatiguing in the highs. This did not improve as it 'run in', or with other mods.
2. 206 has reasonable bass and can be capitvating on well recorded material. Not too forgiving on poor quality recordings
3. 208 is smoother overall with a more even balance, better mid bass.
4. 208 is a little darker, less livelier (thats a good thing) and is forgiving on most material. A more classy performer.
5. In both, you will notice more detail and less distortion than a conventional speaker
6. i found both work well with classical music and small ensembles. not as effective with rock music or orchestral.
7. Both require little amplifier power and work best with tubes in my view.

Have fund!
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Old 12th December 2008, 08:11 AM   #6
wixy is offline wixy  Australia
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Quote:
Originally posted by adamt
I have the Fe208e sigma and T90a combination in a D-58es horn. I have played around with the crossover and found one capacitor of 1.0uF is the best. no need for an L pad, just wire it direct.

I have compared the fe206e and fe208e sigma and they are chalk and cheese. here are my thoughts:
1. 206 is exciting, but fatiguing in the highs. This did not improve as it 'run in', or with other mods.
2. 206 has reasonable bass and can be capitvating on well recorded material. Not too forgiving on poor quality recordings
3. 208 is smoother overall with a more even balance, better mid bass.
4. 208 is a little darker, less livelier (thats a good thing) and is forgiving on most material. A more classy performer.
5. In both, you will notice more detail and less distortion than a conventional speaker
6. i found both work well with classical music and small ensembles. not as effective with rock music or orchestral.
7. Both require little amplifier power and work best with tubes in my view.

Have fund!
I own FE206E's and agree with point 1 and 2, but in response to point 6 and 7, I think they do very well with rock music (if horn loaded) and perform equally great with either tubes or t-amps.
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Old 12th December 2008, 12:01 PM   #7
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Quote:
Originally posted by wixy


I own FE206E's and agree with point 1 and 2, but in response to point 6 and 7, I think they do very well with rock music (if horn loaded) and perform equally great with either tubes or t-amps.
I've heard 206e in a Dallas II, and I agree they do rock.

Amp in charge of my future Dallas speakers is an AMP5 from 41Hz (bigger Tripath) and for backup a modded T-amp.
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Old 12th December 2008, 04:25 PM   #8
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Quote:
Originally posted by adamt
1. 206 is exciting, but fatiguing in the highs. This did not improve as it 'run in', or with other mods.
There are ways to tame them.

dace
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Old 12th December 2008, 05:51 PM   #9
Puffin is offline Puffin  United Kingdom
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Like this.

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Old 14th December 2008, 02:13 PM   #10
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Quote:
Originally posted by planet10


There are ways to tame them.

dace

Hi planet10, I contacted you over e-mail about your 206en. Sorry but the shipping thing didn't work out.

Could you compare stock 206 to 208?
I can get my hands on a pair of 208+T90A for about double the price of a stock 206. Do you think that's a good deal (is the upgrade worth the money)?
Any ideas about 208 and phase plugs ? Do they need them? They don't have just a regular dustcap.

I'll probably try to do a enable process on 208, first with pieces of duck tape for a try-out. Any thoughts on that ?
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