| Altec H811 B horns [message #20883] |
Mon, 07 July 2014 13:47  |
Iowa Boy
Messages: 767
Registered: June 2014
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Senior Member |
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Well couldn't wait on original Kustom siren horns since I want to get this system up and running. Bought a set this weekend on Ebay at what I thought was a good deal. I know they will not fit in my D-130 cabinets since they are too long but plan to build a box and set them on top of the cabinets. This way, I now will be able to use all 4 of my speaker jacks from my 400 amp (2 k200b amps in one cabinet). So far I have only been able to find a couple of original Altec driver (908-16a) but there watt rating is 40-80 rms. Would like to go with something closer to the 200 watt level if possible. Any help would be appreciated.
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| Re: Altec H811 B horns [message #20884 is a reply to message #20883] |
Mon, 07 July 2014 21:12  |
stevem
Messages: 4778
Registered: June 2004
Location: NY
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Senior Member |
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If you cross them over above 1K,40 watts is LOUD!
A real good speaker is rated at 98 db, and those drivers are rated at 108 or better which is over twice as loud as the 98 db speaker driven with the same 40 watts!
[Updated on: Mon, 07 July 2014 21:23] Report message to a moderator |
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| Re: Altec H811 B horns [message #20886 is a reply to message #20883] |
Tue, 08 July 2014 07:13 |
stevem
Messages: 4778
Registered: June 2004
Location: NY
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Senior Member |
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A High frequency driver can not just be hooked up right to a amps output.
Those drivers are made to work from 500 hz and up, so there needs to be a crossover put in place, be it just a simple cap like Kustom used a lot , or a better form of crossover be it a passive type or a active type where a whole other amp is used to power the high frequency section.
In regards to crossover point, going up from the beginning 500hz to 1000hz will sound better and save the voice coil of the driver a ton of stress from not having to handle those lower frequencies!
[Updated on: Tue, 08 July 2014 07:14] Report message to a moderator |
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| Re: Altec H811 B horns [message #20887 is a reply to message #20883] |
Tue, 08 July 2014 12:34 |
chicagobill
Messages: 2010
Registered: April 2003
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Senior Member |
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And remember that due to the physics involved in sound, it will take two to four times the power to drive the low frequencies than it will to drive the high frequencies to an equal loudness.
If you are going to use a single amp system, a simple capacitor and resistor crossover with an L-pad control would probably work best for your add on cabinets. That way, you can use the L-pad to set the level of the highs to better balance with the low frequencies.
I'm going to guess that out in the interwebs there are sites where you can design your crossover by inserting data and getting back resistor and capacitor values, etc.
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| Re: Altec H811 B horns [message #20897 is a reply to message #20883] |
Wed, 09 July 2014 08:27 |
stevem
Messages: 4778
Registered: June 2004
Location: NY
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Senior Member |
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Eminence makes a 2013-16 model 2 bolt driver that handles 85 watts rms and goes for 80 bucks from parts express, I would not beat your wallet up for any driver that handles more power than this!
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