External passive crossovers... In front of the power amplifier?

luvdunhill · 26th July 2007, 10:40 PM

so, I have decided to locate the crossover for my new speaker outside the box near my amplifier... then I got to thinking, would there be any advantage to locating the crossover between the preamp and amplifier? Maybe located in a tape loop on the preamp? Then I could have multiple crossovers and switch between them?

I guess there could be some impedance matching issues, or something... any ideas?

richie00boy · 26th July 2007, 10:42 PM

No that's called a passive line level crossover. Some like them but IMO you might as well make it active and get even more benefits.

You are of course realising that putting something at line level needs one amp channel per drive unit?

D.A.R.R.Y.L. · 26th July 2007, 10:42 PM

Passive xover is for use between power amp and loudspeaker.
What you want is the use of active filtering between pre-amp and power amp. So, an entirely different matter!

luvdunhill · 26th July 2007, 11:37 PM

Quote:

Originally posted by D.A.R.R.Y.L.
Passive xover is for use between power amp and loudspeaker.
What you want is the use of active filtering between pre-amp and power amp. So, an entirely different matter!

right, I understand what active filtering is. I guess I was asking about a passive crossover between the preamp and power amplifier, if this was possible or if someone could describe the pros and cons of doing such a thing

theAnonymous1 · 26th July 2007, 11:42 PM

It's called a PLLXO (passive line level crossover).......

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

Commercialy made PLLXO's.......

http://www.hlabs.com/technical/crossovers/

jupiterjune · 26th July 2007, 11:49 PM

if I recall Marchand electronics claims they have incredibly good S/N ratio, which, being a passive component, I would have to believe. I haven't looked at his website lately, I'm not sure if he still has them for sale.

JJ

luvdunhill · 27th July 2007, 12:11 AM

Quote:

Originally posted by theAnonymous1
It's called a PLLXO (passive line level crossover).......

http://www.t-linespeakers.org/tech/f...ssiveHLxo.html

Commercialy made PLLXO's.......

http://www.hlabs.com/technical/crossovers/

very cool. that's exactly what I was thinking of. Actually, this is a good example of combining the PLLXO and a traditional passive crossover:

http://www.silcom.com/~aludwig/Sysdes/System.gif

so ... I will have to think more about this

luvdunhill · 27th July 2007, 12:13 AM

Quote:

Originally posted by jupiterjune
if I recall Marchand electronics claims they have incredibly good S/N ratio, which, being a passive component, I would have to believe. I haven't looked at his website lately, I'm not sure if he still has them for sale.

JJ

I'm assuming this is what you're referring to?

http://www.marchandelec.com/xm46.html

jupiterjune · 27th July 2007, 12:58 AM

Yes, that is the one.

Sometime last year(or before) Audio Express (Audio XPress?)had some articles on passive line level crossovers.

Unfortunately, I have no idea what issues those articles were in. I think there were two, but it might have only been one.

JJ

26th July 2007, 10:40 PM	#1
luvdunhill diyAudio Member Join Date: Jul 2006	External passive crossovers... In front of the power amplifier? so, I have decided to locate the crossover for my new speaker outside the box near my amplifier... then I got to thinking, would there be any advantage to locating the crossover between the preamp and amplifier? Maybe located in a tape loop on the preamp? Then I could have multiple crossovers and switch between them? I guess there could be some impedance matching issues, or something... any ideas?

26th July 2007, 10:42 PM	#2
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	No that's called a passive line level crossover. Some like them but IMO you might as well make it active and get even more benefits. You are of course realising that putting something at line level needs one amp channel per drive unit? __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

26th July 2007, 10:42 PM	#3
D.A.R.R.Y.L. diyAudio Member Join Date: Mar 2002 Location: Haarlem	Passive xover is for use between power amp and loudspeaker. What you want is the use of active filtering between pre-amp and power amp. So, an entirely different matter! __________________ {Marantz CD-7 Guido Tent Clock ---> HMS Sestetto MKII XLR ---> Electrocompaniet ECI-4 ---> Kimber 8TC ---> Eros MKII DIY}

26th July 2007, 11:42 PM	#5
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	It's called a PLLXO (passive line level crossover)....... http://www.t-linespeakers.org/tech/f...ssiveHLxo.html Commercialy made PLLXO's....... http://www.hlabs.com/technical/crossovers/ __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	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

26th July 2007, 11:49 PM	#6
jupiterjune diyAudio Member Join Date: Nov 2006	if I recall Marchand electronics claims they have incredibly good S/N ratio, which, being a passive component, I would have to believe. I haven't looked at his website lately, I'm not sure if he still has them for sale. JJ

27th July 2007, 12:58 AM	#9
jupiterjune diyAudio Member Join Date: Nov 2006	Yes, that is the one. Sometime last year(or before) Audio Express (Audio XPress?)had some articles on passive line level crossovers. Unfortunately, I have no idea what issues those articles were in. I think there were two, but it might have only been one. JJ

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Speaker connectors for use with external crossovers	luvdunhill	Multi-Way	6	2nd April 2008 12:58 AM
external passive crossover	spacejay	Multi-Way	4	24th January 2006 10:41 PM
dB loss by using passive crossovers? Active vs Passive and 1st vs 4th order	Hybrid fourdoor	Multi-Way	3	11th July 2004 09:16 PM
External Crossovers...	Mos Fetish	Multi-Way	18	16th April 2004 02:18 AM
Passive External Crossover Wiring	Duster	Multi-Way	2	19th January 2004 10:01 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read