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Old 4th November 2017, 05:42 PM   #171
WalterW is online now WalterW  Netherlands
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Quote:
Originally Posted by scottjoplin View Post
Hi, if you are using a "super tweeter" move it as close to the wideband as possible to minimise comb filtering
Thanks, I had the same idea, but was in a doubt because the Super tweeter is often used with the supplied wooden holder to be put on top of an existing speaker...???
This is just a test baffle from cheap MDF, the definitive version will be of Baltic birch plywood and I will correct it then.
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Old 4th November 2017, 05:46 PM   #172
WalterW is online now WalterW  Netherlands
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Originally Posted by woody View Post
Walter, that network you mentioned is talked about in post 13 .
Woody, yes I have read that many times, but it doesn't answer my question.
Like I said the 4KHz doesn't match with my 7.1 KHz calculation??? or maybe I am totally wrong???
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Old 4th November 2017, 05:50 PM   #173
WalterW is online now WalterW  Netherlands
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Originally Posted by gadut View Post
I'm using different fullrange for OB, but settled T90a like yours with 0.47uF AN copper. i'd rather leave the Fullrange without any filter at all. I tried hpf with 100uF or pllxo to protect the cone from damage during bluray movie, but it suck out good midbass during music session, decided to use separate 3way floorstand for movie. however my subwoofer is using active dsp with lpf @80Hz 24dB which blend nicely with FR.
Thanks for the tip! I will listen to the combination without the 100uF also.
Funny you came to the exact same value as I did. Also funny I also ordered yesterday a Audyn True Copper Max capacitor 33Euro's for 0.47uF
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Old 4th November 2017, 11:51 PM   #174
gadut is offline gadut  Indonesia
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Quote:
Originally Posted by WalterW View Post
Thanks for the tip! I will listen to the combination without the 100uF also.
Funny you came to the exact same value as I did. Also funny I also ordered yesterday a Audyn True Copper Max capacitor 33Euro's for 0.47uF
based on T90a pdf, it should be paired with 1.5uF & Lpad, but when I tested it in low volume, the sound seems stressed, 0.47u is perfect airy. my capacitor test with solen, rusia caps, ampohm, vishay 1822 and finally audionote is my choice

looking at SAL 5.5xmax 0.8 qts, it has potential for extra bassboost, you might try it gently. with my 8" fullrange, 3mm xmax and 1.3 qts, i used opamp tone control to add more bass and the result is amazing. it gives more 'weight' to music which has different character than 15" or 21" bass. T-bass seems interesting instead of using opamp for precious SIT amplifier or other FW clone :kidding:

Last edited by gadut; 4th November 2017 at 11:53 PM.
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Old 1st December 2017, 05:22 PM   #175
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally Posted by WalterW View Post
I have a question about the cross-over from Nelson. What does the L2,R3,C2 filter do? Is it a baffle step correction? Or just to dampen/filter a peak in the frequency response?
If I calculate the resonance frequency of 1uf parallel with 0.5mH I would say it's a bandpass filter at 7.1KHz with a very low Q because of the 3.3 Ohm resistor.
In my crossover I can switch it in and out, see picture, but I like the sound better without that filter.
It is as you describe, and of course can be adjusted to taste.
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Old 1st December 2017, 06:05 PM   #176
WalterW is online now WalterW  Netherlands
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Ah, thank you Mr. Pass.

I will give it another try, now I have installed my T90A's, and not missing out on highs anymore.
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Old 26th December 2017, 08:25 PM   #177
sphinxvc is offline sphinxvc  United States
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Hey guys, I bought a pair of these from the store here a month or two ago, but never did anything with them. If any of you are interested in saving some dosh for what's essentially a new pair, let me know.
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Old 7th January 2018, 11:28 AM   #178
laverda is offline laverda  United Kingdom
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Default SAL OB project update

Over the holiday period I had a few hours to waist and fashioned some foam grilles for the OB project, mainly to made it more 'un-industrial'. I don't like the centre grille and it was just a quick 'lets see job' needs more of a curve (dome) A future project...

I am now fully active and what a surprise these OB speakers are..and I have yet to implement time alignment software and filters. I can't see myself ever going back to a box type speaker..
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Old 10th January 2018, 01:35 PM   #179
Frank40 is offline Frank40  Denmark
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Quote:
Originally Posted by laverda View Post
Over the holiday period I had a few hours to waist and fashioned some foam grilles for the OB project, mainly to made it more 'un-industrial'. I don't like the centre grille and it was just a quick 'lets see job' needs more of a curve (dome) A future project...

I am now fully active and what a surprise these OB speakers are..and I have yet to implement time alignment software and filters. I can't see myself ever going back to a box type speaker..
Nice, I like the way your sub cover looks, but you need some work for the full range Keep us posted
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Old 12th January 2018, 02:16 AM   #180
aoc is offline aoc  Malaysia
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I just bought a pair of SAL... Can't wait to try it when I bring it home to Penang.

Frank,
I got a seal box about 80l would that be a good fit for sealed box?
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