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Old 14th September 2003, 11:50 AM   #1
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Question need subwoofer diy amp project

want to build home amp(200-700w/8ohm) for infinity kappa 12.1 perfect driver.
any sugestions please. Ihave expierence to build amp.
thanks for help,and email me
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Old 18th September 2003, 05:26 PM   #2
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Excellent choice in subwoofer, please tell me you're running it in a sealed box. Is it a 4+4 Ohm? You'll need +/-80v rails for that kind of power. You could try large Mosfets or a series of TIP35/TIP36. Many feel there are better devices out there but I've had great success with them. You may want to use forced cooling if you don't want enormous heatsinks. To support that kind of power you'll need more than one transformer. Probably a parellel/series arangment. You could parellel the transformers after the rectifier section into the rails to stiffen them up.
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Old 19th September 2003, 06:13 AM   #3
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Default subwoofer amp

hello,

I choose infinity kappa for its low price and soft,and powerfull bass. this project is to my friend,which like theese kind of sound.
I have morel 224 woofers,and morel mtd 33 tweeters home made speaker,which has enought bass for my taste(even with my built zen v4),but in some music,or in home theater..

do you have complete project, I would be very thankful for it?

only one project i found in net which is p68- rod elliots 300w sub amp.

as I understand- amp for this kappa model would be about 400-600 real wats in 4ohm load. which is need few trafs in comon 800-1000VA,and as much transistors,as lower output resistance to this amp,and bigger damping factor,which is key to goood bass control..

frankly speaking I want to hear this driver how it will give me a drive

I want a closed box, which bass is deep and flat, but my friend wants resonances and conviced me to built ported box,with fhaseinverter.

I will be glad to hear from You- greetings from lithuania.


and class
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Old 19th September 2003, 07:21 AM   #4
UrSv is offline UrSv  Sweden
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http://www.aussieamplifiers.com/

If he's still around is hard to say it seems. Fairly nice simple amps though.
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Old 19th March 2004, 12:53 PM   #5
gras is offline gras  South Africa
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Cool Infinity Perfect 12

Hi
I just got one of those perfect 12 sub's I woold like to know what
volume is good for home theater use , I just build a vented box
3.3 cub Ft tuned at 30 Hz but sound a bit boomy ?
Thanks
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Old 19th March 2004, 12:59 PM   #6
gras is offline gras  South Africa
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Cool Infinity Perfect 12

Hi
I just got one of those perfect 12 sub's I woold like to know what
volume is good for home theater use , I just build a vented box
3.3 cub Ft tuned at 30 Hz but sound a bit boomy ?
Thanks
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Old 22nd March 2004, 01:05 AM   #7
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http://sound.westhost.com/projects-1.htm

ESP project 68
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Old 22nd March 2004, 05:47 AM   #8
IVX is offline IVX  Russian Federation
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IMHO class D for sub (for full range too!) it's a best choice.
http://amploid.narod.ru/article.htm
about 400W for irf540n ( IRFB52N15D will be much better)
damping factor >>1000
THD 0.02%@100hz
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Old 22nd March 2004, 09:46 AM   #9
JDeV is offline JDeV  South Africa
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Default Re: Infinity Perfect 12

Quote:
Originally posted by gras
Hi
I just got one of those perfect 12 sub's I woold like to know what
volume is good for home theater use , I just build a vented box
3.3 cub Ft tuned at 30 Hz but sound a bit boomy ?
Thanks
Hi Gras, where do you buy your drivers in SA?

When you ask about volume, is it sound level (SPL, dB) or box volume?

How did you design your box? Did you try WinISD? Did you use any bracing and/or stuffing inside?
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Old 22nd March 2004, 04:28 PM   #10
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Quote:
as I understand- amp for this kappa model would be about 400-600 real wats in 4ohm load. which is need few trafs in comon 800-1000VA
It is not clear to me that you need parallel transformers. One 800 VA would be more cost effective. Make sure you had adequate cap capacity would also seem important to providing the amp adequate power during music peaks.

In any case with this type of VA you would definitely need a "soft start" circuit to keep the current in-rush under control, putting less load on the CAPs, lenthening there life and keeping the lights from dimming :-).
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