Need help with midwoofer choice for 2-way

dabbler · 27th June 2011, 12:25 PM

Im looking for a 6.5" midwoofer with decent efficiency for a 2-way in sealed cab with subwoofer. I was contemplating the 18 Sound 6ND430 until I saw the frequency response from Zaph's tests:

Zaph|Audio

The efficiency drops very quickly from 200hz down. Am I right to assume that after BSC efficiency will be in the low 80's?

The Tang Band W6-1721 on the same page looks like it will achieve much better sensitivity (due to the 100-200hz hump negating need for BSC) with higher xmax, lower Fs. Its also about half the cost of the 6ND430.

Am I looking at this correctly? Is the TB a better choice here?

dabbler · 27th June 2011, 12:35 PM

Just noticed the impedance of the W6-1721 drops to 4 ohms. Ill be using a 1970's Yamaha amp to power it, not sure of that will be a problem?

mayhem13 · 27th June 2011, 08:57 PM

Quote:

Originally Posted by dabbler

Im looking for a 6.5" midwoofer with decent efficiency for a 2-way in sealed cab with subwoofer. I was contemplating the 18 Sound 6ND430 until I saw the frequency response from Zaph's tests:

Zaph|Audio

The efficiency drops very quickly from 200hz down. Am I right to assume that after BSC efficiency will be in the low 80's?

The Tang Band W6-1721 on the same page looks like it will achieve much better sensitivity (due to the 100-200hz hump negating need for BSC) with higher xmax, lower Fs. Its also about half the cost of the 6ND430.

Am I looking at this correctly? Is the TB a better choice here?

The 18Sound is more of a midrange than a woofer, BUT if crossed over to a sub high enough (130-150hz) it should retain it's efficiency. A sealed box is tough here and with BSC, let's say 1/2 then we're talking 89-90db efficiency. You want higher efficiency, look 8" or larger pro woofer or multiple 6.5"s. No real sealed box bass performance from any of these until 12" but.......

dabbler · 28th June 2011, 09:15 AM

Quote:

The 18Sound is more of a midrange than a woofer, BUT if crossed over to a sub high enough (130-150hz) it should retain it's efficiency. A sealed box is tough here and with BSC, let's say 1/2 then we're talking 89-90db efficiency. You want higher efficiency, look 8" or larger pro woofer or multiple 6.5"s. No real sealed box bass performance from any of these until 12" but.......

Id be happy with 89db of sensitivity, however won't I have some pretty severe localisation issues with the sub at 150hz crossover? Sub will not be sitting between the speakers.

Got burnt spending lots of money on a very well regarded B&C 10inch woofer and feel hesitant to try anything bigger than 6.5". I want to ensure I get a clean midrange at the expense of some efficiency.

sreten · 28th June 2011, 10:15 AM

Hi,

Your observations on overall sensitivity for the two drivers is correct.
But note Zaph tested the 16 ohm version, 4 and 8ohm versions are
available, both should have higher sensitivity than the 16 ohm.

rgds, sreten.

dabbler · 28th June 2011, 12:12 PM

Hi Sreten,

I did notice that, though oddly enough, the eighteen sound data sheet shows the 16ohm with higher efficiency compared to the 8ohm datasheet:

6ND430 - LF Neodymium Driver

HYPERTUNE · 28th June 2011, 12:20 PM

That would be because it's rated in watts rather than volts.

dabbler · 28th June 2011, 12:45 PM

The PDF on that page shows a graph for the 16ohm with a higher sensitivity in the frequency response over 100-200hz.

022066N430-6ND430-16.pdf

HYPERTUNE · 28th June 2011, 01:12 PM

Either way, it's not really suitable for your application.

What about the SB17?

dabbler · 28th June 2011, 02:21 PM

Yep ive been looking closely at the SB17. Above average efficiency and the high QTS, models nicely in a 15 litre sealed cabinet, should blend nicely with the sub.

CSD plot isnt up there with the best though. Any of you guys had experience with these drivers?

27th June 2011, 12:25 PM	#1
dabbler Account disabled at member's request Join Date: Apr 2010 Location: Between cities!	Need help with midwoofer choice for 2-way Im looking for a 6.5" midwoofer with decent efficiency for a 2-way in sealed cab with subwoofer. I was contemplating the 18 Sound 6ND430 until I saw the frequency response from Zaph's tests: Zaph\|Audio The efficiency drops very quickly from 200hz down. Am I right to assume that after BSC efficiency will be in the low 80's? The Tang Band W6-1721 on the same page looks like it will achieve much better sensitivity (due to the 100-200hz hump negating need for BSC) with higher xmax, lower Fs. Its also about half the cost of the 6ND430. Am I looking at this correctly? Is the TB a better choice here?

28th June 2011, 10:15 AM	#5
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Your observations on overall sensitivity for the two drivers is correct. But note Zaph tested the 16 ohm version, 4 and 8ohm versions are available, both should have higher sensitivity than the 16 ohm. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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27th June 2011, 12:35 PM	#2
dabbler Account disabled at member's request Join Date: Apr 2010 Location: Between cities!	Just noticed the impedance of the W6-1721 drops to 4 ohms. Ill be using a 1970's Yamaha amp to power it, not sure of that will be a problem?

28th June 2011, 12:12 PM	#6
dabbler Account disabled at member's request Join Date: Apr 2010 Location: Between cities!	Hi Sreten, I did notice that, though oddly enough, the eighteen sound data sheet shows the 16ohm with higher efficiency compared to the 8ohm datasheet: 6ND430 - LF Neodymium Driver

28th June 2011, 12:20 PM	#7
HYPERTUNE diyAudio Member Join Date: May 2006 Location: Sydney	That would be because it's rated in watts rather than volts.

28th June 2011, 12:45 PM	#8
dabbler Account disabled at member's request Join Date: Apr 2010 Location: Between cities!	The PDF on that page shows a graph for the 16ohm with a higher sensitivity in the frequency response over 100-200hz. 022066N430-6ND430-16.pdf

28th June 2011, 01:12 PM	#9
HYPERTUNE diyAudio Member Join Date: May 2006 Location: Sydney	Either way, it's not really suitable for your application. What about the SB17?

28th June 2011, 02:21 PM	#10
dabbler Account disabled at member's request Join Date: Apr 2010 Location: Between cities!	Yep ive been looking closely at the SB17. Above average efficiency and the high QTS, models nicely in a 15 litre sealed cabinet, should blend nicely with the sub. CSD plot isnt up there with the best though. Any of you guys had experience with these drivers?

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