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Multi-Way Conventional loudspeakers with crossovers

tri amping a jvc sp-555wd
tri amping a jvc sp-555wd
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Old 17th October 2010, 04:34 AM   #11
Francec is offline Francec  Australia
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Quote:
If this speaker can't be tri amp because of missing information, is there a speaker that can be DIY to suit for tri amping? Anyone tried to do tri amping already?
I have tri-amped my speakers;
Bass Peerless 830868 8"
Mid Peerless 832873 5"
Tweeter Vifa D25 1"
And they work a treat.

Regarding the cat amps, I suppose you could but why would you when you would need a battery and charger or a high Amp 12V supply? I would (have) opt for the mains supply and use one large toroidal transformer.

Quote:
Questions:
If I connect the P19 amp to the tweeter, do I need to have a 25uF cap in series with the tweeter? Is the 25uF sufficient? I guess The P3A will be directly connected to the Mid as well as the Low.

If car amp1 is 25w stereo and will be driving a two 4 ohms tweeter, then the current will be 5A. Am I right?
If car amp2 is 50w stereo and will be driving a two 8 ohms Midrange, then the current will be 5A. Likewise for the Bass
So, the Regulated power supply will be be rated 20A (5A allowance) and 12V. Again, please correct me if I'm wrong.
Yes, Yes and yes but with a speaker protector in circuit.
I don't follow the second paragraph.

Frank
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Old 17th October 2010, 09:58 AM   #12
atnil is offline atnil  Canada
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Frank, Sound Dr:

Sound Dr,
Thank you for the link you provided: Silicon chip online


Frank,
It's good to hear you have a triamped system. It must have nice listening to the sound of it. I never thought it can actually be done.
Now, I'm ordering the pcb from esp and build the P19 and P3A amps.

Q1: Is it possible to build one P19 and two P3A amps in a single enclosure? Each amp has its own power supply or just one power supply? OR Does it have to be separate enclosure and power supply for each amp?
How about installing the three amps in/out of the speaker box? (impossible I guess)

Q2: About your tri amped speaker, did you design and build them yourself? Do you know if there 's a kit for a tri ampable speaker? If there's no kit, will you please share your knowledge in building/DIY the speaker? A detailed drawing of the speaker box maybe?


Thank you.
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Old 17th October 2010, 03:52 PM   #13
atnil is offline atnil  Canada
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Frank,

The second paragraph: (I'm trying to calculate the voltage and current rating of the planned regulated power supply) Following the formula of current= square root of (power/resistance)

"If car amp1 is 25w stereo and will be driving a two 4 ohms tweeter, then the current will be 5A. Am I right?
If car amp2 is 50w stereo and will be driving a two 8 ohms Midrange, then the current will be 5A. Likewise for the Bass
So, the Regulated power supply will be be rated 20A (5A allowance) and 12V. Again, please correct me if I'm wrong."

I'm thinking of a diy power supply that use a torroidal transformer to power the three car amps mentioned above. 12V, 20A power supply maybe?

Also, please see attached image (pasetup4.gif) for my inspiration (dream).
Attached Images
File Type: gif pasetup4.gif (27.8 KB, 35 views)

Last edited by atnil; 17th October 2010 at 04:05 PM. Reason: insert image
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Old 18th October 2010, 01:28 AM   #14
Francec is offline Francec  Australia
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Quote:
I'm thinking of a diy power supply that use a toroidal transformer to power the three car amps mentioned above. 12V, 20A power supply maybe?
The supply should be 13.8V DC for the car amps if you are going to use them. It will work though it does seem an expensive way to go about it.

Frank
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Old 20th October 2010, 01:10 PM   #15
atnil is offline atnil  Canada
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Frank,
It's good to hear you have a triamped system. It must have been nice listening to the sound of it. I never thought it can actually be done.
Now, I'm ordering the pcb from esp and build the P19 and P3A amps.

Q1: Is it possible to build one P19 and two P3A amps in a single enclosure? Each amp has its own power supply or just one power supply? OR Does it have to be separate enclosure and power supply for each amp?
How about installing the three amps in/out of the speaker box? (impossible I guess)

Q2: About your tri amped speaker, did you design and build them yourself? Do you know if there 's a kit for a tri ampable speaker? If there's no kit, will you please share your knowledge in building/DIY the speaker? A link or a detailed drawing of the speaker box maybe?
Or can you please point me to where can I buy already made tri ampable ready speaker?

Thank you.
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Old 21st October 2010, 12:01 AM   #16
Francec is offline Francec  Australia
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atnil,
I am very happy with my speakers. It can be done and has been many times, such as this, Bi-amping and Tri-amping: Why and How and on Rod Elliott's web site.
My amps and crossovers are built into the base of the speakers and are fed by a balanced input, using XLR connectors, from my pre-amp.
I used one power supply and I really doubt that separate supplies are worth it and are certainly not cost effective.
Either in or out of the box is possible and practical, you really need to think it through first and do many 'doodlings' on paper to see how it will look - lots of measuring too.

My speaker started out as a two-way published in a 1985 now defunct Australian magazine, Australian Electronics Monthly. I did, initially, bi-amp a two way last year, doing one speaker first, and was able to compare them. The passive crossover sounded as if it had a towel draped over the front over it in comparison to the active speaker.

Heartened by the improvement, I added a mid range driver and tri-amped the original passive. It, too, was an improvement so I now have tri-amped speakers. I should point out that this whole exercise started as a result of me setting fire (literally) to my amp while a drunken night with friends listening to the Rolling Stones. The amp took out one bass driver and the rest is now history, as they say.

I had the drivers already (I replaced the burnt bass drivers -both boxes with a Peerless comparable) so I didn't actually have to plan that aspect. You have the JVCs so I would use them. You have a variable crossover, don't be afraid to experiment. Just make sure you don't turn up the volume until they are ready.

One thing I do suggest to anyone wishing to go this way is ensure you use good quality drivers that have a wide frequency range so that the driver roll-off is not a factor you need to take into account. Let the crossover do that for you.


Frank
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Old 28th October 2010, 02:04 PM   #17
atnil is offline atnil  Canada
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Frank,
Thank you very much for all the info you shared. I have a lot of learning to do.
Right now, I'll be concentrating on getting the esp boards and building the amps. Hopefully everything will be smooth during the construction and testing.
Again, thank you for spending time with a newbie.
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Old 28th October 2010, 07:29 PM   #18
JamesTRexx is offline JamesTRexx  Netherlands
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Quote:
Originally Posted by atnil View Post
Anyone tried to do tri amping already?
Bit of a late reply, but I started out with tri-amping my Tannoy D611's.
The whole story can be found here.
The advantage I had was knowing the original crossover frequencies, everything else was still experimental, measuring and more bliss. ;-)
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