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Multi-Way Conventional loudspeakers with crossovers

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Old 15th February 2012, 07:03 PM   #71
gfiandy is offline gfiandy  United Kingdom
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Hi Sreten,

I know this is a bit off topic, but have you used both Tina-ti and LT-spice. I currently use LT-Spice and wondered if it was worth changing.

Regards,
Andy
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Old 16th February 2012, 01:28 AM   #72
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by gfiandy View Post
Hi Sreten,

I know this is a bit off topic, but have you used both Tina-ti and LT-spice.
I currently use LT-Spice and wondered if it was worth changing.

Regards,
Andy
Hi,

I don't use simulators much, I play with them, I do have both and I
find TinaTi a lot easier but I know it a lot better than LT-Spice, which
TBH I've never been able to play with, and have barely touched it.

For a beginner I definitely say Tina-Ti, FWIW it was developed in
Poland I think as a teaching tool, it has some great features, and
friendly user interface, the best I've seen in a (free) simulator.

What I don't know are the limitations and the integration with
say layout tools, the extent of the libraries etc if your taking
it seriously, or the relative in depth features of both packages.

As I'm into speakers you've got to like a package that has an
impedance meter you can connect in place of an AC source.

rgds, sreten.
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Last edited by sreten; 16th February 2012 at 01:31 AM.
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Old 16th February 2012, 05:29 AM   #73
system7 is offline system7  United Kingdom
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You guys have done THREE PAGES of off-topic and trolling here. You are too dumb to understand allpass networks and making terrible mistakes in understanding them. I have built and tested them with opamps, so I know what I'm talking about. In Rod Elliott's squarewave response the parallel network is connected out of phase, so inevitably gives a ropey step/squarewave response WHICH HE MENTIONS. Reversing the tweeter and aligning the levels will give identical response from series and parallel networks. Can we leave it there, and you guys STFU and get outta here? Sorry to rant.

Back on-topic @ Planet_10. I looked up the simulation for the KEF 104ab which uses the lower inductance B200 SP1039. The bass rolloff isn't too bad, especially since it's been done for the bright midrange setting with 3.5mH.
Attached Images
File Type: jpg KEF_104ab_crossover_1.JPG (153.6 KB, 204 views)
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Old 16th February 2012, 07:41 AM   #74
system7 is offline system7  United Kingdom
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FWIW, the current topic in this thread is helping michelino redesign his speakers around a KEF SP1054 bass unit. I am sure series crossovers are of great interest, they make you think about interaction between filters in a very clear way. But unless you will suggest a series crossover that will work for him, I think you will do well to stop trashing this thread with digressions. The flame war with sreten is rather depressing too.

Start or revive a thread on series crossovers if you want. I would find that interesting myself, but here you are off-topic. The KEF crossovers are really quite interesting, and that is where we are at the moment. It's interesting that if you add the 0.3mH speaker inductance in the 104ab to the 0.6mH coil, you get the classic 3:1 inductor ratio of the third order butterworth LP. The KEF designers are doing elegant stuff here and seem to know the B200 rather well.
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Old 16th February 2012, 07:57 AM   #75
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Off-topic here... Sreten & Speakerman go at series XOs

dave
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Old 21st February 2012, 04:38 PM   #76
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Thanks system7 .... Busy day but here I am ....
So, I've been to a party last weekend with my loudspeakers. Changed room, changed thesound. I've found a better bass, surely "louder"... I think there is something wrong in my bedroom ...
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Old 21st February 2012, 04:44 PM   #77
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TINA is from a Hungarian university academic as far as I know. (University guys form start-ups there as well as here in the UK it seems.
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Old 21st February 2012, 05:12 PM   #78
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by Ouroboros View Post
TINA is from a Hungarian university academic as far as I know.
(University guys form start-ups there as well as here in the UK it seems.

Hi,

It was. But Texas bought them out and the basic version is free.

rgds, sreten.
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Old 21st February 2012, 08:25 PM   #79
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by sreten View Post
Hi,

It was. But Texas bought them out and the basic version is free.

rgds, sreten.
Still off-topic, Sreten. When are you going to GET IT?

Michelino, I've been looking at that B200 SP1054 a bit. 7 ohms Re. Le 0.45mH. For a 10" wide cabinet, your 6dB bafflestep (aka bass boost) is 2.4mH in parallel with 7 ohms. Unsurprisingly close to the KEF 2.7mH.
Loudspeaker Diffraction Loss and Baffle Step Compensation Circuits

I'd then try this third order butterworth on the bass with -3dB @ 2500Hz after the 7 ohm resistor: 0.45mH, 18uF and use the 0.45mH B200 inductance itself as the third term. So it's really electrically the 7 ohm resistor, one inductance and one capacitor to fit.

A modern 6 ohm tweeter with an Fs of around 600-800 Hz ought to be able to cope with a crossover @2500Hz. So the tweeter crossover is 6 ohms, 10uF, 0.2mH and 10uF in 3rd order B/W highpass. The six ohm resistor gives you a slightly different calculation that you can check here:
LC Filter Design

An elegant circuit that ought not to be too far off. I expect a Zobel on the tweet would be good. Impedance Equalization (L-Pad) Circuit Designer / Calculator

Worth trying with non-polar electrolytics before investing in the final circuit.
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Old 21st February 2012, 08:36 PM   #80
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Default Various Questions arround the B200 Versions

1) What means the specification number "SP-10xx" (nomenclature of that number) ?
in the attachment some examples of various B200 versions

2) I have heard, there is a special company in UK, that is able to resurrect all B200 (and B110) versions with damaged voice coil (i. e. overpass in the genuine and new condition).
I want to know this company.

Thank you for advices.
Attached Images
File Type: gif B110_SP1057.gif (149.6 KB, 148 views)
File Type: jpg B200 SP1014.jpg (160.9 KB, 140 views)
File Type: jpg B200 SP1014+SP1039 German.jpg (94.0 KB, 138 views)
File Type: gif B200 SP1022.gif (57.3 KB, 124 views)
File Type: gif B200 SP1039.gif (56.5 KB, 33 views)
File Type: gif B200 SP1054.gif (47.9 KB, 35 views)
File Type: jpg B200 SP1054.jpg (31.2 KB, 35 views)
File Type: gif B200 SP1063.gif (61.7 KB, 41 views)
File Type: jpg B200 SP1075.jpg (58.1 KB, 43 views)
File Type: gif B200 SP1014.gif (50.1 KB, 39 views)
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