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Welcome back to the Advanced/DIY section!


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14 replies to this topic

#1 of 15 OFFLINE   Patrick Sun

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Posted May 08 2001 - 02:44 AM

Just thought I'd get the ball rolling again in this section.

Hopefully by this weekend, I will get some pix/thoughts together and share my latest project, a set of 2.5-way speakers.


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#2 of 15 OFFLINE   Anthony F.

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Posted May 08 2001 - 05:08 AM

I'll bite... what's a 2.5 way speaker? Is this a two-way with 5 subwoofers, or a three way where the sound of one of the drivers only goes half way to the listener? Posted Image

P.S. How is it possible that I signed up before you, but you have more 16 time more posts than I do? Posted Image

#3 of 15 OFFLINE   Patrick Sun

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Posted May 08 2001 - 05:59 AM

It's like a 3-way speaker, but it has a tweeter to handle frequencies from 2000Hz to 20000Hz. It has a full midwoofer that goes from 50Hz to 2000Hz, and it was another midwoofer that's considered the 0.5 midwoofer because it only goes from 50Hz to around 500Hz. This is to compensate for what called the baffle step loss in the bass area around 500Hz and below because bass/low frequencies tends to radiate all around (in 4 pi space), while the higher frequencies tend to radiate from its spot on the baffle and outwards (in 2 pi space). It allows for a more smoother bass response while maintaining a higher overall sensitivity for the speaker.

As for the post thing...dunno... Posted Image

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#4 of 15 OFFLINE   Anthony F.

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Posted May 08 2001 - 06:36 AM

Sounds interesting.... I don't recall ever seeing this design commercially. Do manufacturers usually try to make up for it by using different speaker pairs or crossover designs--or do they not bother to correct this at all?

...And I know why there's a difference in the number of posts.... Posted Image

#5 of 15 OFFLINE   Patrick Sun

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Posted May 08 2001 - 07:13 AM

Well, many are using the MTM design (Midwoofer-Tweeter-Midwoofer), and probably do some baffle step compensation in that manner. But in the TM design, there needs to be some baffle step compensation so that the tweeter doesn't overwhelm the single midwoofer and make it sound too bright.

Mine will be a TMM design, which will look like a conventional 3-way TMW design (tweeter-midrange-woofer).


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PatCave ; HT Pix ; Gear ; Sunosub I + III ; DVDs ; LDs
"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
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#6 of 15 OFFLINE   David A. Frattaroli

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Posted May 08 2001 - 07:31 AM

How 'bout some pics of your center speaker?

#7 of 15 OFFLINE   Mark Hayenga

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Posted May 08 2001 - 08:08 AM

Pat,

My last final is Saturday. I'll be sober and back among the living shortly thereafter.

Mark
"There are 10 types of people in the world: those that understand binary, and those that have friends."

#8 of 15 OFFLINE   Patrick Sun

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Posted May 08 2001 - 08:43 AM

David, it still looks the same. I am contemplating popping in a different tweeter to match upcoming new speakers.

Mark, no hurry, I've been going at a snail's pace with the box construction, but I hope to glue up the panels of one of the boxes tonight. I sort of mucked up the 1st front baffle's tweeter hole (too big), but the 2nd one looks pretty good. I have to borrow my friend's big router for the 3/4" roundover this weekend.


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#9 of 15 OFFLINE   Peter Johnson

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Posted May 08 2001 - 02:13 PM

The B&W LCR6 is a 2.5way design, and I am sure there are many others.

#10 of 15 OFFLINE   Scott M

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Posted May 09 2001 - 12:20 AM

The Paradigm Ref Studio 60 is a 2-1/2(2.5) way design.

Of course it's a tower and not a center but I've got it on the brain...
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-scott
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#11 of 15 OFFLINE   Brian Bunge

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Posted May 09 2001 - 01:29 AM

PSB's Stratus Bronze and Stratus Silver Tower's are both 2.5 way MTM's as well!

Brian
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#12 of 15 OFFLINE   Andrew Beacom

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Posted May 09 2001 - 02:46 AM

FYI:

JM Labs Chorus 715 is a TMM 2.5 way speaker.
JM Labs Chorus LCR 700 is an MTM 2.5 way speaker.



#13 of 15 OFFLINE   BruceD

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Posted May 09 2001 - 05:19 AM

I seem to remember a system with a tweeter, a mid-woofer, and a passive radiator (instead of a port) also being called a 2.5 system. Have you heard that?

#14 of 15 OFFLINE   Patrick Sun

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Posted May 09 2001 - 08:16 AM

Good grief! I didn't realize there were so many 2.5-ways out on the market... Posted Image


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"Jee-sus, it's like Iwo Jima out there" - Roger Sterling on "Mad Men"
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#15 of 15 OFFLINE   Charlie G

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Posted May 10 2001 - 04:27 AM

The Klipsch reference center (RC-3) is 2.5 way. Also, the entire new Klipsch reference line (RF-5, RF-7, RC-7, etc...) are all 2.5 way.

Charlie




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