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Multi-Way Conventional loudspeakers with crossovers

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Old 6th February 2002, 06:10 AM   #11
navin is offline navin  India
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given your drivers I think you can do the following.

1. build a pair of speakers that are extrmely limited in SPL.

2. add a 8 or 10" for the bottom 2 octaves (30-120hz).

If you are using option 1. a simpel 2 way XO at 3kHz will do.
The crossover will have to have the following.

1. difraction compensation that can be simply done by using an oversize inductor in series with the woofer. The exact value is dependent ofn the baffle width.

2. impedance compensation for the woofer.

3. level damping for the tweeter about 3db would be nessacaryy.

If you are using option 2. then things are a bit more complex.

To limit frequenices at 100Hz to the 4" if not cheap of simple. I would even suggest that you consider XO frequencies of 200hz and 3000Hz as your starting points only because 200Hz requires smaller values.

follow simple rules.

1. keep the 2 frequenices atleast decade apart (300-3000) etc... or there will be interplay between components in each crossover.

2. the difraction compensation gets a bit complex but for most part it will only affect your 4".

3. the tweeter padding will still be there

4. the 8-10" woofer would have be well matched in level to the 4" (a few db less than the 4" is better) as any level matching in the 8-10" using Lpads, resistors etc.. will seriously affect dampling factor of the bass.

5. download LSP cad demo and play with it to understand what various components do.
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Old 6th February 2002, 06:49 AM   #12
griff is offline griff  Australia
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guys, its not a 4", its a 6.5"
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Old 7th February 2002, 07:07 AM   #13
navin is offline navin  India
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yeah i know 14 cm is 4" so that is why I recomend a higher freq. than 45-60Hz.

100-120Hz is the minimum. I perfer 200hz ot keep XO price down if you are using 8-10" woofer for last 2 octaves.

One very interesting cabinet design is what Roy Allison did with the Allison 9. This was copied a bit by Jim Thiel in the Thiel CS3.5 I perfer a combination of both.

DO you have a fax number I can fax you a sketch?

are we on the same page? if you need to contact me direct try navin@vsnl.com
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Old 7th February 2002, 07:12 AM   #14
griff is offline griff  Australia
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umm, i dont think we are on the same page, im confused about the driver itself now, i was under the impression that it was 17cm/6.5 inch.
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Old 7th February 2002, 08:32 PM   #15
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Default metric to english units

Quote:
Originally posted by navin
14 cm is 4"
14 cm divided by 2.54 cm/in equals 5.512 inches

ie it is a 5 1/2' driver

dave
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Old 8th February 2002, 11:02 AM   #16
navin is offline navin  India
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5" or 6" either way it is a driver with limited Xmax and limited Sd whihc limits the ammout of SPL esp below 60Hz.

Building a Hihg pass XO at 60Hz is expensive.

1. a 12db network is expensive
2. a 6db network hardly offers any protection

best is to use a active network if you want to limit freq. to 60Hz.

you can get active network+amp for cheap since bass amp does not need to be very accurate, delicate, etc. There are many on the net. some as cheap as $100-150.
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Old 8th February 2002, 12:27 PM   #17
griff is offline griff  Australia
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thanks for all your help navin, im back online so to speak, ill let u know the results.
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Old 9th February 2002, 05:02 AM   #18
navin is offline navin  India
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I believe in keeping things as simple as possible.

although I have heard speakers with some awful complex crossovers that sound nice this is not for beginners or even intermedite speaker DIYers as most DIYers do not have the equipment to build/design speakers.

For example one would need a dedicated setup that consists of a good signal generator, stand mounted mic, PC card to store data read from mic and a software like MLSSA to analyse this data. And that is for starters. One would need access to materials suppliers (ceramic, wood, steel, etc...) and fabricators etc.

A DIYer must learn to trust his/her ears. I still believe this is the best measuring device made. I have had expereinces wiht relative novice music lovers who can discern small (0.5db) differences in the midrange (changing a resistor in a LR difraaction compensation circuit from 3.3ohms to 4 ohms). My wife is my testing ears. Since I am the one doing the soldering I know my opinion will be biased so I use her ears.

Enjoy!
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Old 9th February 2002, 10:35 PM   #19
griff is offline griff  Australia
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ok navin, time to get serious here.

I am now into building a MTM centre channel, and i would love your assistance if possible.

I have a couple drivers combonations that i am throwing up,

1) SEAS CC17RCY x2 with an AUDAX TW025A16
2) VIFA P17WJ x2 with a VIFA D25AG

What do you think of these combonations?

I intend on building after this a Shiva subbie, then floorstanding TM moniters, then finally loudspeaker mains, hopefully with all the same drivers bar the subbie. Budget is of concern, if i could keep driver cost down to around $250 AUD it would be really appreciated by my wallet.

Thanks in advance
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Old 9th February 2002, 11:48 PM   #20
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How did you go with the Shiva subwoofer speaker Griff? Did the driver set you back much?

Glenn
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