AudioRoundTable.com: Speaker » Why does Selah find this to be true?

Home » Audio » Speaker » Why does Selah find this to be true?

Show: Today's Messages :: Navigator :: Polls
E-mail to friend

Why does Selah find this to be true? [message #61057]

Mon, 28 September 2009 11:54

Marlboro
Messages: 403
Registered: May 2009

Illuminati (1st Degree)

Rick Craig>

I've found the 3"-5" woofers work best with the majority of planar / ribbon tweeters in a passive design.

Why have you found this to be the case for you? Measurement? Listening? Critical response of customers or peers?

Just a gut feeling?

I'm more of a WHY GUY; I don't respond well at all to authoritative statements without descriptions of the reasoning or research behind it.

Report message to a moderator

Re: Why does Selah find this to be true? [message #61106 is a reply to message #61057]

Tue, 29 September 2009 19:29

selahaudio
Messages: 56
Registered: September 2009

Baron

Marlboro wrote on Mon, 28 September 2009 11:54

Combination of reasons. Not always customer-driven; in fact, sometimes they're under the assumption that a 80hz-120hz crossover isn't possible with a subwoofer or they want a 7" to run ported and full-range without a sub.

The driver integration to the tweeters and vertical coverage is easier to optimize with the smaller C-T-C spacing and higher crossover point. Measurements and listening experience.

Report message to a moderator

Re: Why does Selah find this to be true? [message #61109 is a reply to message #61106]

Tue, 29 September 2009 20:28

Marlboro
Messages: 403
Registered: May 2009

Illuminati (1st Degree)

Thanks.

If I may ask, and don't feel a need to respond if its proprietary, at what frequency have you chosen to cross your HV's to the Fountek's in your Symmetrica speakers?

Marlboro

Report message to a moderator

Re: Why does Selah find this to be true? [message #61112 is a reply to message #61109]

Wed, 30 September 2009 07:42

selahaudio
Messages: 56
Registered: September 2009

Baron

Marlboro wrote on Tue, 29 September 2009 20:28

Thanks.

If I may ask, and don't feel a need to respond if its proprietary, at what frequency have you chosen to cross your HV's to the Fountek's in your Symmetrica speakers?

Marlboro

Sorry, that's proprietary. Also, a crossover point can be quoted but it can be acoustical or electrical. If it's non-symmetrical that can change things as well.

Report message to a moderator

Re: Why does Selah find this to be true? [message #61113 is a reply to message #61112]

Wed, 30 September 2009 07:56

Marlboro
Messages: 403
Registered: May 2009

Illuminati (1st Degree)

Of course....

The actual point is somewhat less important than the slope of the cross, the symmetry of the cross, and the characteristic acoustic or electrical.

Traditionally when one(not to imply that the "one" is Selah) is using 6.5 - 8 inch woofers with a ribbon one has been forced to cross in the vicinity of 1200-1600 hz.

When one is using 3 inch wide range speakers, one can raise the cross point substantially to something above 2300 or more. Of course everyone should know that this ALWAYS entails the use of a woofer system to go with it since the 3 inch wide range just won't go low enough even with equalization, electronic crossovers, and a high power amp. You can't get a lot of water from a stone, some but not a lot.

Report message to a moderator

Re: Why does Selah find this to be true? [message #61129 is a reply to message #61106]

Thu, 01 October 2009 05:55

AudioFred
Messages: 377
Registered: May 2009
Location: Houston

Illuminati (1st Degree)

selahaudio wrote on Tue, 29 September 2009 19:29

Combination of reasons. Not always customer-driven; in fact, sometimes they're under the assumption that a 80hz-120hz crossover isn't possible with a subwoofer or they want a 7" to run ported and full-range without a sub.

My XT-8 arrays are an example. My wife generously bought me this expensive kit and lets me position these large speakers in our family room, and I didn't want to push the envelope of her generosity by adding a couple of large sub boxes. But with the increased availibility of smaller affordable high quality drivers I might go for a Symmetrica-type array if I were doing it all over again today. No, if I were doing it over again I believe I would go with nine 7" Scan Speak Revelator woofers and nine Fountek ribbons in a ported box. Or then again I might...

http://fredt300b.smugmug.com/Hobbies/Building-the-XT-8-Line-Arrays/362400_3AfcH#P-1-12

Report message to a moderator