Silly mistake - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 1st August 2010, 02:47 AM   #1
diyAudio Member
 
Join Date: Oct 2006
Default Silly mistake

Hi,

I've built my first 2-way project (original thread here) and I like how they sound so far although they are a bit bass shy.

Anyhow, as an impulse buy I ended up buying a Yaqin Vk-2100 hybrid amplifier off ebay to drive them and noticed right after the unit had shipped that it only handled 8 ohm loads. After contacting the seller he mentionned that it does not like 4 ohms loads and runs really hot and could get damaged.

I've been googling all day to find a solution to this and see if there was any way to change the impedance load of my towers (my first reflex was to simply add a resistance in series) only to realize that things weren't that simple.

So here's the question: Is there an easy solution to this, besides selling the amp and buying one that handles 4 ohms loads? Could I use an l-pad for he fr125s to help with the bass shyness and "adjust" the impedance load at the same time (at least increase it a little to make it easier on the amp)?

Thanks in advance!
E.

Last edited by squidlydeadly; 1st August 2010 at 02:49 AM.
  Reply With Quote
Old 1st August 2010, 05:46 AM   #2
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
How do you arrive at 4 ohms?
I think you are OK if your crossover network isn't competely wonked.. Dont you have an EQ for bass?
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  Reply With Quote
Old 1st August 2010, 07:17 AM   #3
diyAudio Member
 
Join Date: Oct 2006
Hi,

Unless I'm mistaken (and I can very well be since I'm new at this) the fr125s has an Re of 7 ohms and the impedance curve is fairly flat over the crossover point, same for the sdx7 at 6.4 ohms and both are connected in parallel that would be around 3.something ohms.

As far as my crossover being wonked that's also a possibility however I went with a first order XO to try and not mess it up to much.

The amp as a loudness comp but no EQ.

Funny story: I took me a while to figure out why no sound was coming out of the sdx7... I didn't know you had to strip the red coating of the inductor wires

Live a learn I say :-)
E.

Last edited by squidlydeadly; 1st August 2010 at 07:22 AM.
  Reply With Quote
Old 1st August 2010, 08:17 AM   #4
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
Join Date: May 2005
Location: Californication
Yea that the whole purpose of crossovers, they are not really in parallel.
__________________
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
  Reply With Quote
Old 1st August 2010, 08:34 AM   #5
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
The speaker will be a comfortable 8 ohms.

Because of the XO the SDX7 has a very high impedance above the XO point.

Because of the XO the FR125 has a very high impedance below the XO point.

A very high impedance in parallel with 8 ohms is 8 ohms.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 1st August 2010, 03:03 PM   #6
diyAudio Member
 
Join Date: Oct 2006
Wow ok.

Didn't think I was missing the boat that much....it makes sense though...I think ...back to reading!

Thanks guys. At least my "problem" is solved!

E.
  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
Has any-one else made this mistake??? Moondog55 Multi-Way 15 3rd January 2009 11:31 PM
Rookie mistake?...Maybe... cjkpkg Tubelab 9 10th October 2008 10:01 PM
Smells like a mistake krzanik Tubes / Valves 15 27th May 2005 01:55 AM
Look for the mistake wuffwaff Digital Source 3 10th January 2004 07:40 AM


New To Site? Need Help?

All times are GMT. The time now is 08:56 AM.


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