38 hz tapped horn, volvotreter - diyAudio
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Old 18th November 2009, 12:13 AM   #1
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Default 38 hz tapped horn, volvotreter

I am about to build my first diy 38hz tapped horn following volvotreters plans. a couple of questions:

1. should the mouth fire at the wall or away from the wall?
2. what exactly does the inductor do and how do i install it and where do i install it? from what I gather i need this piece:

Erse Super Q 4.7mH 16 AWG 500W Inductor, 0.231 Ohm DCR
Parts Express Part #266-924

3. can this be run off the channels of a typical home receiver since it doesnt need many watts?

thanks for any help that can be provided.

Todd
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Old 18th November 2009, 01:48 AM   #2
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1) Away from the wall
2) The inductor smooths out the freq response. I think it should be wired in series, that piece you quoted looks ideal.
3) Yep, you should have no problem running it from a spare amp channel, the tang band should not need (or be used with) a lot of power.
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Old 18th November 2009, 03:00 AM   #3
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do i need two of those inductors? is there any instructions on how to install/wire it? where do i put it inside the tapped horn?
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Old 18th November 2009, 03:39 AM   #4
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Well, it depends on what you are doing.

If I recall, the design uses a single woofer and a single inductor. How many are you building?

Honestly, I'd consider just leaving the inductor out, as the actual response will be more colored by the room. A few dB of deviation within the passband of the tapped horn will likely be dwarfed by room effects.
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Old 18th November 2009, 04:06 PM   #5
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if i face the mouth towards the wall do get more bass output/response? i will just scratch the inductor idea then.
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Old 18th November 2009, 05:34 PM   #6
JLH is offline JLH  United States
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Quote:
Originally Posted by radman12 View Post
if i face the mouth towards the wall do get more bass output/response? i will just scratch the inductor idea then.
If you corner load the tapped horn you will gain some sensitivity, but it will not go lower in frequency like a normal front loaded horn.

Don't be too quick to throw out the inductor. You should try it both ways before you decide. In 3 of the 8 tapped horns I've build, I like the response better with the inductor.
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Old 18th November 2009, 06:15 PM   #7
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when you say sensitivity does that mean louder? also does the inductor come with instructions becuase i dont really understand how you wire that in or where i mount it inside the enclosure.
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Old 18th November 2009, 09:35 PM   #8
curtisc is offline curtisc  United States
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Quote:
Originally Posted by radman12 View Post
when you say sensitivity does that mean louder? also does the inductor come with instructions becuase i dont really understand how you wire that in or where i mount it inside the enclosure.
the inductor will not come with instructions, but according to one of the posts above, you will need to wire it in series, meaning that you will need to connect one wire (end) of the inductor to the + speaker terminal, and the other to the + connection cup or amp

amp +======mmmmm====+speaker

= is wire
m is inductor
+ are the terminals

hope that helps
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Old 18th November 2009, 10:53 PM   #9
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awesome that should makes sense, maybe it will more once i see the actual inductor. where should i place the inductor in the enclosure?
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Old 20th November 2009, 11:36 AM   #10
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I'm really interested in making this sub too, are these speakers available in the UK or the EU? if not then can anyone suggest a speaker that is available and cheap for making a small TH.

thanks

Ross
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