My A7.3 with Helper

sts9fan · 12:01 AM

I had the Exodus Anarchy drivers in a pair of tapped horns I did not really care for so I figured they would make a good helper woofer. These are the cheap Parts Express cabs that I know can be easily beaten. This is more of a beginning then an end. I am using a MiniDSP and the amp on the A7 has a volume control used to match up. I started with a 48db/Octave LR at 300hz. So far it sounds really good. I have the woofer box is 0.5ft^3 tuned to 45hz with a theoretical F3 of <40hz. I wantd to tune it to 40hz but the port became a hassle. The A7 box is 0.25ft^3 sealed. Both have been treated with vinyl tiles and felt. Over the next week I hope to take some measurments and tweak things. I plan to flip the cabs, adjust, xover points and generally mess around with the things. FUN!

zman01 · 9th April 2012, 12:24 AM

Good project - tell us more about your findings as you "find" them

.

You mentioned the tapped horns - any paricular reason why you didn't like them?

sts9fan · 9th April 2012, 12:27 AM

The small tapped horns did not have the output I was looking for. With four maybe but I don't have that space.
I will also say, I am loving the A7s. They can handle complex music better then any of the other FR drivers I have tried.

zman01 · 9th April 2012, 12:35 AM

Quote:

Originally Posted by sts9fan

I am loving the A7s. They can handle complex music better then any of the other FR drivers I have tried.

Yes, they are pretty amazing in that regard.

fakeout · 9th April 2012, 01:51 AM

Wait, you have two wires coming out of 2 speakers so you'd have 4 wires to hook up. Do you mind saying how you're hook up at the other end? I'm going to extreme n00b levels here.

sts9fan · 9th April 2012, 01:55 AM

I use a minidsp as a crossover to two amps.

KyleinCowichan · 9th April 2012, 02:27 AM

Nice! I have a miniDSP waiting for a similar use. What amps are you using? I bought the miniAMP with the miniDSP. TuxedoCivic measured my Overnight Sensations and figured out the settings to use the DSP+AMP as an active crossover +amps. Worked out really well.

KM

sts9fan · 9th April 2012, 02:44 AM

I mostly use low watt class A which was not really appropriate for this application.
So I am using a few amps I had laying around. The woofers are being driven by a Twisted Pear chip amp and the A7 by a Virtue tripath jobbie. I am on the lookout for a suitable 4ch amp.

KyleinCowichan · 9th April 2012, 03:34 AM

I have a pair of CHR70s that are plenty loud on a 15w t-amp but I am sure that's far too little for most woofers. On the other hand, hooking up the chrs to something like a Sure 4x100w doesn't seem like the right thing either given their sensitivity. Maybe 2 amps is going to be the best solution? This is just a feeling though, I am short on practical experience when it comes to this. Perhaps some others can weigh in?

KM

chrisb · 9th April 2012, 03:47 PM

Quote:

Originally Posted by KyleinCowichan

I have a pair of CHR70s that are plenty loud on a 15w t-amp but I am sure that's far too little for most woofers. On the other hand, hooking up the chrs to something like a Sure 4x100w doesn't seem like the right thing either given their sensitivity. Maybe 2 amps is going to be the best solution? This is just a feeling though, I am short on practical experience when it comes to this. Perhaps some others can weigh in?

KM

even in multi way system with independent passive XO stages, separate channels of amplification for each driver section should yield the most benefits

with something like minidsp, or any degree of line level XO ( passive or active) multiple amps would definitely be required, and assuming that appropriate attenuation is available at or before the amps, I can see no reason to not use identical power amp modules all around if that's what you've got on hand

8th April 2012, 11:59 PM	#1
sts9fan diyAudio Member Join Date: Apr 2006 Location: MA	My A7.3 with Helper I had the Exodus Anarchy drivers in a pair of tapped horns I did not really care for so I figured they would make a good helper woofer. These are the cheap Parts Express cabs that I know can be easily beaten. This is more of a beginning then an end. I am using a MiniDSP and the amp on the A7 has a volume control used to match up. I started with a 48db/Octave LR at 300hz. So far it sounds really good. I have the woofer box is 0.5ft^3 tuned to 45hz with a theoretical F3 of <40hz. I wantd to tune it to 40hz but the port became a hassle. The A7 box is 0.25ft^3 sealed. Both have been treated with vinyl tiles and felt. Over the next week I hope to take some measurments and tweak things. I plan to flip the cabs, adjust, xover points and generally mess around with the things. FUN! Last edited by sts9fan; 9th April 2012 at 12:01 AM.

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9th April 2012, 12:24 AM	#2
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	Good project - tell us more about your findings as you "find" them . You mentioned the tapped horns - any paricular reason why you didn't like them?

9th April 2012, 12:27 AM	#3
sts9fan diyAudio Member Join Date: Apr 2006 Location: MA	The small tapped horns did not have the output I was looking for. With four maybe but I don't have that space. I will also say, I am loving the A7s. They can handle complex music better then any of the other FR drivers I have tried.

9th April 2012, 01:51 AM	#5
fakeout diyAudio Member Join Date: Feb 2012	Wait, you have two wires coming out of 2 speakers so you'd have 4 wires to hook up. Do you mind saying how you're hook up at the other end? I'm going to extreme n00b levels here.

9th April 2012, 01:55 AM	#6
sts9fan diyAudio Member Join Date: Apr 2006 Location: MA	I use a minidsp as a crossover to two amps.

9th April 2012, 02:27 AM	#7
KyleinCowichan diyAudio Member Join Date: Dec 2010 Location: Cowichan Bay, BC	Nice! I have a miniDSP waiting for a similar use. What amps are you using? I bought the miniAMP with the miniDSP. TuxedoCivic measured my Overnight Sensations and figured out the settings to use the DSP+AMP as an active crossover +amps. Worked out really well. KM

9th April 2012, 02:44 AM	#8
sts9fan diyAudio Member Join Date: Apr 2006 Location: MA	I mostly use low watt class A which was not really appropriate for this application. So I am using a few amps I had laying around. The woofers are being driven by a Twisted Pear chip amp and the A7 by a Virtue tripath jobbie. I am on the lookout for a suitable 4ch amp.

9th April 2012, 03:34 AM	#9
KyleinCowichan diyAudio Member Join Date: Dec 2010 Location: Cowichan Bay, BC	I have a pair of CHR70s that are plenty loud on a 15w t-amp but I am sure that's far too little for most woofers. On the other hand, hooking up the chrs to something like a Sure 4x100w doesn't seem like the right thing either given their sensitivity. Maybe 2 amps is going to be the best solution? This is just a feeling though, I am short on practical experience when it comes to this. Perhaps some others can weigh in? KM