help building an amp of sorts? - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 4th June 2008, 12:04 AM   #1
diyAudio Member
 
Join Date: Jun 2008
Exclamation help building an amp of sorts?

Hey guys, I have a 400watt compression horn driver and I need to build something to drive it to a volume of about human voice. I was thinking it to be along the lines of input (for my guitar), volume, and output (for driver). Basically an amp with no speaker just an out put.

(I guess this would be called an amp head? Idk)
  Reply With Quote
Old 4th June 2008, 12:31 AM   #2
lineup is offline lineup  Sweden
diyAudio Member
 
lineup's Avatar
 
Join Date: Dec 2005
Location: the north
What is the senitvity of your intended speaker / horn?

To get to the level of a human voice does not take much power / watts.
For a normal sensitivity speaker ( ~ 88-90 dB SPL )
probably only 0.1 Watt or so.

A speaker with 90dB sensitivity puts out 90dB .. at 1 Watt ( 2.83Vrms output into 8 Ohm ).
And 90dB is LOOOUUUD!!!

Regards
__________________
lineup
  Reply With Quote
Old 4th June 2008, 01:00 AM   #3
diyAudio Member
 
Join Date: Jun 2008
104 dB SPL 1W/1M

8 Ohm Impedance
  Reply With Quote
Old 4th June 2008, 01:00 AM   #4
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally posted by lineup
What is the senitvity of your intended speaker / horn?

To get to the level of a human voice does not take much power / watts.
For a normal sensitivity speaker ( ~ 88-90 dB SPL )
probably only 0.1 Watt or so.

A speaker with 90dB sensitivity puts out 90dB .. at 1 Watt ( 2.83Vrms output into 8 Ohm ).
And 90dB is LOOOUUUD!!!

Regards

Just buy a cheap amp off ebay or from an online store.
Anything below 50 watts would do the job fine with plenty of overhead.

You could get away with less watts but I find you lose some transient response with lower wattages.
  Reply With Quote
Old 4th June 2008, 01:37 AM   #5
diyAudio Member
 
unclejed613's Avatar
 
Join Date: Dec 2006
a horn that efficient only needs 1 watt or less for the application you're describing. 50 watts would give you about 121db SPL. that's 104db + 17db (for 50 watts. i took 100watts=20db, subtract 3db (for cutting in half to 50 watts)=17db.

121db is just above the threshold of pain. if you're simulating a normal human speaking voice, go with a good 5 watt amp.
__________________
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 4th June 2008, 01:42 AM   #6
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally posted by unclejed613
a horn that efficient only needs 1 watt or less for the application you're describing. 50 watts would give you about 121db SPL. that's 104db + 17db (for 50 watts. i took 100watts=20db, subtract 3db (for cutting in half to 50 watts)=17db.

Yes but thats going full whack, in which case your transients have long since started clipping.

In practice real music has a huge dynamic range compared to testing the amp with a sine wave.
  Reply With Quote
Old 4th June 2008, 02:39 AM   #7
diyAudio Member
 
Join Date: Nov 2004
Location: Florida
Might want to try a mono chip-amp.
  Reply With Quote
Old 9th June 2008, 12:45 AM   #8
diyAudio Member
 
Join Date: Jun 2008
My line 6 spider III 30w amp can drive the horn driver alone at a pretty decent volume, however, since I'm using it in a talkbox and it has to run through about 10 ft of vinyl tubing by the time it reaches my mouth its so quiet I can barely hear it.

But I found my dads old JVC JR-S300 Mark II stereo receiver and when I plug it up to that and turn on the radio it gets about the right volume.

I don't know what the output wattage is on the JVC but my dad seems to think its around 50W. I has some information on the back but I couldn't find a clearly marked output wattage.
  Reply With Quote
Old 9th June 2008, 01:21 AM   #9
Banned
 
Join Date: Jan 2008
Blog Entries: 2
Sorry, this is a horn driver without a horn being employed in an unconventional fashion?

Normally a horn driver actually drives an exponential horn which provides an impedance match to the atmosphere.

Otherwise the apparent volume produced by the driver will be very small. I think you'll get a lot of distortion too, because of the failure to accoustically load the driver and the reflections at the mismatch.

Does the tube connect directly to the driver or is there a change in diameter?

Anyway, please clarify...

w
  Reply With Quote
Old 9th June 2008, 01:36 AM   #10
diyAudio Member
 
Join Date: Jun 2008
No. I have two plumbing parts connect to the open hole in my compression horn driver to the 10ft long 1/2" OD x 3/8" ID Vinyl tubing. Also I've been messing around with it and if my dad is right, and the output is around 50W (I'll know soon enough I've emailed JVC), than I may even want a little more wattage. Maybe something around 60-70 watts or an amp head with a peak of 100w and a volume control so I can get the desired volume.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FYI: Dynaco ST 400 (A reveiw of sorts) The Donk! Solid State 5 4th September 2013 01:42 PM
Should I even consider building wad06 Subwoofers 25 28th January 2005 03:52 AM
GC's in all sorts of boxes.... JDeV Chip Amps 1 11th June 2003 09:26 PM
Water as a heat tank of sorts PaulHilgeman Parts 7 2nd May 2003 03:30 AM


New To Site? Need Help?

All times are GMT. The time now is 09:27 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2