Drive from crossover?

Mach5 · 12th May 2009, 12:07 AM

I'm working on a new 3way speaker from a scratch design. Eventually I'd like this to a an active system. Right now I'm using a crown stereo amp for power and crossover(digital) duties so I can adjust more easily. The issue is that finding a tri-amp suitable for active mounting is difficult, much less finding a good one(and $$$!!). I could build a 3way tube amp for, which would be kinda cool. But this will get in the way of developing the speaker for a couple of months I'm guessing.

So the question is this. Since my speaker has about a 105~110db sensitivity can I just drive it directly from a DSP crossover at line levels? Only temporarily until I can afford to do proper amps of course
Someone told me line level is about 2V in general but what's the wattage? 1/3watt should be fine right?

also, any thoughts on the resistance loads a digital crossover is intended to drive vs. a speakers's load

tinitus · 12th May 2009, 12:42 AM

Quote:

Originally posted by Mach5

Right now I'm using a crown stereo amp for power and crossover(digital) duties so I can adjust more easily.

Ehhh, how

tinitus · 12th May 2009, 01:26 AM

btw, google "41hz audio amp kits"
They have several small and cheap amp modules that might suit your needs

Mr Evil · 12th May 2009, 01:41 AM

An op-amp, as might be used for a line-level output, will typically have a maximum output current of around 20mA. This is woefully inadequate to drive a speaker. You will at best get a quiet, but horribly distorted output, and at worst you will fry something.

forr · 12th May 2009, 06:33 AM

Hi Mach5,

Some guys in France - I think one of them is JM Le Cleac'h - have loaded the output of a DCX Bheringer with horns through an elevating transformer. As JM is writing on this forum, you could ask him more details.

Mach5 · 12th May 2009, 07:34 AM

Quote:

Originally posted by tinitus

Ehhh, how

Crown xti 2000 has a built in DSP

It's not the ideal hifi amp though and a bit bulky to mount to the speaker and it's only stereo.

Mach5 · 12th May 2009, 07:48 AM

Quote:

Originally posted by forr
Hi Mach5,

Some guys in France - I think one of them is JM Le Cleac'h - have loaded the output of a DCX Bheringer with horns through an elevating transformer. As JM is writing on this forum, you could ask him more details.

Hmm, calling lecleach and all French experimenters to release the secret and free music from amps once and for all

12th May 2009, 12:07 AM	#1
Mach5 diyAudio Member Join Date: Apr 2009	Drive from crossover? I'm working on a new 3way speaker from a scratch design. Eventually I'd like this to a an active system. Right now I'm using a crown stereo amp for power and crossover(digital) duties so I can adjust more easily. The issue is that finding a tri-amp suitable for active mounting is difficult, much less finding a good one(and $$$!!). I could build a 3way tube amp for, which would be kinda cool. But this will get in the way of developing the speaker for a couple of months I'm guessing. So the question is this. Since my speaker has about a 105~110db sensitivity can I just drive it directly from a DSP crossover at line levels? Only temporarily until I can afford to do proper amps of course Someone told me line level is about 2V in general but what's the wattage? 1/3watt should be fine right? also, any thoughts on the resistance loads a digital crossover is intended to drive vs. a speakers's load

12th May 2009, 01:41 AM	#4
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	An op-amp, as might be used for a line-level output, will typically have a maximum output current of around 20mA. This is woefully inadequate to drive a speaker. You will at best get a quiet, but horribly distorted output, and at worst you will fry something. __________________ https://mrevil.asvachin.eu/

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12th May 2009, 01:26 AM	#3
tinitus diyAudio Moderator Join Date: Nov 2005	btw, google "41hz audio amp kits" They have several small and cheap amp modules that might suit your needs

12th May 2009, 06:33 AM	#5
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Hi Mach5, Some guys in France - I think one of them is JM Le Cleac'h - have loaded the output of a DCX Bheringer with horns through an elevating transformer. As JM is writing on this forum, you could ask him more details.

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