tri-amped driver choice

13814044 · 31st January 2008, 01:58 PM

Hi
I'm looking for advice on driver selection for a gainclone amp under construction.

The basic configuration is a tri-amped stereo design with 100w bass, 50w mid, 50w tweeter with 3/way active crossover and utilizing lm3886 ic's for output stages. The amp is designed for 8 ohm load, but with paralleled chips on the woofer (thus requiring 4ohm load).

Does anyone have suggestions or criticism on the configuration? Is the balance in output power between woofer mids and tweeters ok?

Robh3606 · 31st January 2008, 02:26 PM

Have selected your drivers yet?? Hard to say if your power is "right". That depends on which drivers and what SPL's you want from them. Also your crossover point will help determine how much power a driver needs as well. I run a 3 way active set-up with 200/100/100. I have 3db more amp headroom but depending on driver sensitivities if you had more efficient drivers you could actually have more headroom than my set-up using 1 watt 1 meter as a reference.

My woofer in this set-up is on the low side at 89-90db. So I can expect to get 110 max out on peaks minus say 6db for distance so 104db where I sit.

Look at it this way more power isn't going to get you in trouble but underpowering will if it less than you need to meet your SPL requirements.

Rob

ianpengelly · 31st January 2008, 03:29 PM

Its worth having a read through this thread:

Construction journey-Active 3-way

Hope this helps.

Ian

sdclc126 · 31st January 2008, 04:16 PM

IMHO you're putting the cart before the horse - it sounds like you're trying to design a speaker around an amplifier/crossover set-up, when you should be designing the speaker first, and then designing the electronics around what you want the speaker to do.

56oval · 1st February 2008, 07:56 AM

PHL drivers .

Cheers.

Brett · 2nd February 2008, 02:25 AM

Quote:

Originally posted by sdclc126
IMHO you're putting the cart before the horse - it sounds like you're trying to design a speaker around an amplifier/crossover set-up, when you should be designing the speaker first, and then designing the electronics around what you want the speaker to do.

Enormous +1, though I do factor in amp power and output Z when I design the speakers.

13814044 · 6th February 2008, 06:37 PM

Also your crossover point will help determine how much power a driver needs as well. I run a 3 way active set-up with 200/100/100. I have 3db more amp headroom but depending on driver sensitivities if you had more efficient drivers you could actually have more headroom than my set-up using 1 watt 1 meter as a reference.

Rob

[/B][/QUOTE]

31st January 2008, 01:58 PM	#1
13814044 diyAudio Member Join Date: Dec 2007	tri-amped driver choice Hi I'm looking for advice on driver selection for a gainclone amp under construction. The basic configuration is a tri-amped stereo design with 100w bass, 50w mid, 50w tweeter with 3/way active crossover and utilizing lm3886 ic's for output stages. The amp is designed for 8 ohm load, but with paralleled chips on the woofer (thus requiring 4ohm load). Does anyone have suggestions or criticism on the configuration? Is the balance in output power between woofer mids and tweeters ok?

31st January 2008, 04:16 PM	#4
sdclc126 diyAudio Member Join Date: Jan 2005 Location: San Diego, CA	IMHO you're putting the cart before the horse - it sounds like you're trying to design a speaker around an amplifier/crossover set-up, when you should be designing the speaker first, and then designing the electronics around what you want the speaker to do. __________________ Soft Dome

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31st January 2008, 02:26 PM	#2
Robh3606 diyAudio Member Join Date: Nov 2002 Location: Destiny	Have selected your drivers yet?? Hard to say if your power is "right". That depends on which drivers and what SPL's you want from them. Also your crossover point will help determine how much power a driver needs as well. I run a 3 way active set-up with 200/100/100. I have 3db more amp headroom but depending on driver sensitivities if you had more efficient drivers you could actually have more headroom than my set-up using 1 watt 1 meter as a reference. My woofer in this set-up is on the low side at 89-90db. So I can expect to get 110 max out on peaks minus say 6db for distance so 104db where I sit. Look at it this way more power isn't going to get you in trouble but underpowering will if it less than you need to meet your SPL requirements. Rob

31st January 2008, 03:29 PM	#3
ianpengelly diyAudio Member Join Date: Oct 2006	Its worth having a read through this thread: Construction journey-Active 3-way Hope this helps. Ian

1st February 2008, 07:56 AM	#5
56oval diyAudio Member Join Date: Jun 2006	PHL drivers . Cheers.

6th February 2008, 06:37 PM	#7
13814044 diyAudio Member Join Date: Dec 2007	Also your crossover point will help determine how much power a driver needs as well. I run a 3 way active set-up with 200/100/100. I have 3db more amp headroom but depending on driver sensitivities if you had more efficient drivers you could actually have more headroom than my set-up using 1 watt 1 meter as a reference. Rob [/B][/QUOTE]

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