Bass respone for 6.5" in OB

sharptouch · 2nd December 2008, 09:26 PM

Maybe a stupid question but I have to ask, when will a 6.5 inch driver drop in bass response in OB. I have Seas magnesium in mind. THX

pedroskova · 2nd December 2008, 09:45 PM

It depends on the width of your baffle, and your driver's Qts. My current test mule, with a ~ 23cm main baffle (with tapered wings forming a quasi U baffle), rolls off at around 200Hz. This is a function of the baffle and the fact that the Qts of the driver is .28.

hope this helps

sharptouch · 2nd December 2008, 09:49 PM

Yes it did help me

so bass response increases with a wider baffle?

pedroskova · 2nd December 2008, 10:31 PM

Look here ...and...here , and you will learn more than you might want to learn.

short answer: yes.

gainphile · 2nd December 2008, 10:41 PM

I've tried multiple times with 6 and 5" drivers in OB. In short: They don't work. There is simply *no* bass and I'm talking eq-ed xo. Perhaps round 300-400hz rolloff.

On the other hand 10" is fine even with smallish (28cm) baffle. EQ-ed of course.

Pano · 3rd December 2008, 01:19 AM

Right.

For OB you need to move a lot of air. The little drivers just don't. 1x12" or 2x10" is pretty much minimum for OB.

CLS · 3rd December 2008, 01:36 AM

I've tried a single 8" fullranger in a baffle of 120cm x 90cm. After 15dB of boost, it's quite 'listenable', but in a very small space and very limited SPL. (the cone moves a lot when playing bass-heavy passages)

pedroskova · 3rd December 2008, 02:05 AM

The question is - did the original poster intend to use a 6.5" driver as a "bass" driver or was he only wanting to know the useful lower range of that driver?

Cloth Ears · 3rd December 2008, 02:40 AM

Quote:

Originally posted by gainphile
I've tried multiple times with 6 and 5" drivers in OB. In short: They don't work. There is simply *no* bass and I'm talking eq-ed xo. Perhaps round 300-400hz rolloff.

On the other hand 10" is fine even with smallish (28cm) baffle. EQ-ed of course.

This one would work to about 100, but the baffle might have to be a bit bigger than is SAF-able. I'm going to try it in a folded piece of ply that I've already got lying around and see how it sounds. When they arrive, of course...

Quote:

Originally posted by CLS
I've tried a single 8" fullranger in a baffle of 120cm x 90cm. After 15dB of boost, it's quite 'listenable', but in a very small space and very limited SPL. (the cone moves a lot when playing bass-heavy passages)

Your average f/r will need a high-pass, otherwise it may easily pole in an O/B. They work best in the bass area when loaded (ie. horn, b/r, sealed).

sharptouch · 3rd December 2008, 08:27 AM

My intention was to use it with a subwoofer and it seems I would need one for each speaker

2nd December 2008, 09:26 PM	#1
sharptouch diyAudio Member Join Date: Aug 2008	Bass respone for 6.5" in OB Maybe a stupid question but I have to ask, when will a 6.5 inch driver drop in bass response in OB. I have Seas magnesium in mind. THX

2nd December 2008, 10:41 PM	#5
gainphile diyAudio Member Join Date: Dec 2007 Location: Melbourne the sunny city!	I've tried multiple times with 6 and 5" drivers in OB. In short: They don't work. There is simply no bass and I'm talking eq-ed xo. Perhaps round 300-400hz rolloff. On the other hand 10" is fine even with smallish (28cm) baffle. EQ-ed of course. __________________ http://gainphile.blogspot.com

3rd December 2008, 01:19 AM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Right. For OB you need to move a lot of air. The little drivers just don't. 1x12" or 2x10" is pretty much minimum for OB. __________________ Take the Speaker Voltage Test!

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2nd December 2008, 09:45 PM	#2
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	It depends on the width of your baffle, and your driver's Qts. My current test mule, with a ~ 23cm main baffle (with tapered wings forming a quasi U baffle), rolls off at around 200Hz. This is a function of the baffle and the fact that the Qts of the driver is .28. hope this helps

2nd December 2008, 09:49 PM	#3
sharptouch diyAudio Member Join Date: Aug 2008	Yes it did help me so bass response increases with a wider baffle?

2nd December 2008, 10:31 PM	#4
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	Look here ...and...here , and you will learn more than you might want to learn. short answer: yes.

3rd December 2008, 01:36 AM	#7
CLS diyAudio Member Join Date: Jun 2005 Location: Taiwan	I've tried a single 8" fullranger in a baffle of 120cm x 90cm. After 15dB of boost, it's quite 'listenable', but in a very small space and very limited SPL. (the cone moves a lot when playing bass-heavy passages)

3rd December 2008, 02:05 AM	#8
pedroskova RIP Join Date: Dec 2002 Location: C'ville VA, USA	The question is - did the original poster intend to use a 6.5" driver as a "bass" driver or was he only wanting to know the useful lower range of that driver?

3rd December 2008, 08:27 AM	#10
sharptouch diyAudio Member Join Date: Aug 2008	My intention was to use it with a subwoofer and it seems I would need one for each speaker

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