Modification of a combo?? - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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 9th March 2011, 03:30 AM   #1
diyAudio Member
 
Join Date: Nov 2010
Question Modification of a combo??

Hello to everyone out there, and i am sorry for so many posts.

I have a Question.

Would it be to any advantage to re-design my combo amp?? What i plan to do is make it a closed amp, plus upgrade the driver. It currently has an 8 inch driver with an unknown impedance (guessing 8?) So would it be to my advantage to make the box bigger, and make it closed?? i want to increase volume, so will doing this help?? I can not hear it well at a comfortable volume at 50 feet away, and i will be at an outdoor gigs.

Any other ideas how i can mod this

it is a crate G10XL.
  Reply With Quote
Old 9th March 2011, 06:29 AM   #2
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Unlikely. An 8" driver just won't do it, especially with the limited power input available.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 9th March 2011, 04:13 PM   #3
Cassiel is offline Cassiel  Libya
diyAudio Member
 
Cassiel's Avatar
 
Join Date: Sep 2004
Location: Madrid
Best idea is to build a separate cabinet fitted with a 12" and bypass your speaker. Read this:

Peak SPL Calculator
  Reply With Quote
Old 9th March 2011, 11:37 PM   #4
Minion is offline Minion  Canada
diyAudio Member
 
Join Date: May 2006
Location: Cowican Bay , vancouver island
a closed back isn"t going to make it louder and a bigger speaker won"t make it louder because it takes more power to drive a bigger speaker (of the same sensitivity and impedance) ......

if you want it louder try a more sensitive speaker , a 93db speaker would be twice as loud as a 90db speaker , and a 96db would be twice as loud as a 93db ......

I use a 101db speaker in one of my amps and it is loud enough to jam with a drummer when only on about 3 (100w amp) .......


Now a bigger speaker that was much more sensitive than your 8in would probably get you a louder and bigger sound ........
  Reply With Quote
Old 10th March 2011, 04:56 AM   #5
diyAudio Member
 
unclejed613's Avatar
 
Join Date: Dec 2006
yeah... what he said..... it's usually less expensive to find a better speaker than to get a bigger amp. the price difference between a 90db and a 93db speaker is fairly small, but the difference in price between a 100W amp and a 200W amp is usually rather large, but the result of a 3db increase in SPL is the same.... likewise you might pay maybe twice as much switching from an 85db speaker to a 95db speaker, but the price difference between a 100W amp and (if you can find one...) a 1000W amp is prohibitive, but either way you get a 10db increase in SPL (assuming of course the 1kW amp doesn't vaporize the voice coils on the 85db speakers first...)
__________________
Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net
spammer trap: spammers must die
  Reply With Quote
Old 10th March 2011, 06:18 AM   #6
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Quote:
Originally Posted by Minion View Post
a closed back isn"t going to make it louder and a bigger speaker won"t make it louder because it takes more power to drive a bigger speaker (of the same sensitivity and impedance) ......

if you want it louder try a more sensitive speaker , a 93db speaker would be twice as loud as a 90db speaker , and a 96db would be twice as loud as a 93db ......

I use a 101db speaker in one of my amps and it is loud enough to jam with a drummer when only on about 3 (100w amp) .......


Now a bigger speaker that was much more sensitive than your 8in would probably get you a louder and bigger sound ........
A +3dB change requires double the power (to match), but a +10dB difference is perceived as twice as loud.
What makes you say you need more power to drive a bigger speaker?

Chris
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 11th March 2011, 02:13 PM   #7
diyAudio Member
 
Join Date: Feb 2010
Location: in half space
Quote:
Originally Posted by chris661 View Post
....a +10dB difference is perceived as twice as loud.
By monkeys listening to sine waves on headphones, perhaps, but for over two hundred years four violins have sounded "twice as loud" as one violin to concert goers listening to real music in a hall.
  Reply With Quote
Old 11th March 2011, 05:20 PM   #8
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Four violins:

each doubling of radiating area gives +3dB, and each double of input power gives +3dB.

The example you've given would have +12dB over a single violin. Which, it has to be said, isn't far off +10dB.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  Reply With Quote
Old 11th March 2011, 05:47 PM   #9
diyAudio Member
 
Join Date: Feb 2010
Location: in half space
Quote:
Originally Posted by chris661 View Post
Four violins:

each doubling of radiating area gives +3dB, and each double of input power gives +3dB.
Are you asking each musician to play twice as hard, or are you specifying two violinists per instrument?
  Reply With Quote
Old 11th March 2011, 06:55 PM   #10
diyAudio Member
 
chris661's Avatar
 
Join Date: Feb 2008
Location: Sheffield
Blog Entries: 8
Each violinist puts in the same amount of effort as the first violinist on his/her own.
So there's 4x the acoustic energy from the sum of people operating the instruments, and another 4x from the extra radiating area of the violin bodies, strings, etc.
A 16x increase in acoustic energy gives +12dB.
__________________
"Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo
My setup: http://www.diyaudio.com/forums/multi...tang-band.html
  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
Whats the better combo here? 2 way / 3 way ? invincible77 Multi-Way 12 14th October 2010 08:01 PM
Has any tried this combo with a MTM mcmahon48 Multi-Way 3 25th March 2009 05:14 PM
Best combo 4 car kensr05 Car Audio 4 24th March 2006 06:45 AM
best sub + amp combo? Xplorer Car Audio 2 13th June 2004 10:12 PM


New To Site? Need Help?

All times are GMT. The time now is 01:15 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