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Multi-Way Conventional loudspeakers with crossovers

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Old 13th September 2007, 08:05 PM   #11
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Quote:
Originally posted by tinitus
I suppose only the best ribbons are worth the effort
And they are usually quite costly!
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Old 13th September 2007, 10:42 PM   #12
owdi is offline owdi  United States
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markr89 - Your request for a check has resulted in a unanimous DONT DO IT. You are far better off picking a proven design, then building the crossover. Don't be afraid of the crossover, they are not difficult to assemble. You don't even need to know how to use a soldering iron, as crimping everything together works just fine.

IMO, the RS180 is a great choice, but it is not a good match for that ribbon. That ribbon needs to be crossed over high, which the RS180 does not like. Why don't you try a project with a simpler crossover?

The Zaph Audio BAMTM would be a fantastic choice, and fits within your budget. The crossover is super simple, only 5 components per side.

Just to wet your appetite, these are my top 3 favorite sites with well documented projects

http://www.zaphaudio.com
http://www.rjbaudio.com
http://www.humblehomemadehifi.com/

Dan
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Old 13th September 2007, 11:56 PM   #13
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Stock crossover + your own selected drivers = A horrible sounding speaker.

Really - it's like buying a car that runs on gas (petrol), then buying a barrel of diesel then expecting the car to run.

Worst case - your combination could blow up your amplifier (if the crossover and drivers all combined present a very low load).

All the links below have designs from proven designers. Build one of them.

Cheers,
David.
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Old 14th September 2007, 04:38 AM   #14
markr89 is offline markr89  United States
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hell, am i glad i checked with you guys first; putting $300 (on a student's budget) into speakers and realizing they have all the acoustical grandeur of a 'my chemical romance' song remixed by yung joc played through a pair of busted ipod headphones would have been enough for me to do something crazy like buy a pair of bose speakers and encode all my audio into 54kbps mp3's (gasp). but all in all it seems as if the Seas 27TBFCG design from www.eldamar.net/audio/RS150MTM/ have the experts' blessing. The last question is would i encounter any problems with this setup running in the db616tl (a transmission line) enclosure? i attached pictures so you know where I'm coming from if you're unfamiliar.
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Old 14th September 2007, 05:33 AM   #15
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Quote:
Originally posted by markr89 The last question is would i encounter any problems with this setup running in the db616tl (a transmission line) enclosure? i attached pictures so you know where I'm coming from if you're unfamiliar.
Very likely. The db616TL uses different woofers (and IIRC was pre MJK so could be better anyway.)

dave
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Old 14th September 2007, 10:00 AM   #16
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by planet10

Very likely. The db616TL uses different woofers
dave
Hi,

I agree, and the db616TL uses 6.5 woofers not 5" woofers.

TBH the RS150S is a good driver but not a bass monster.

The floorstanding version of the BAMTM is a better choice for bass.

http://www.zaphaudio.com/BAMTM.html

/sreten.
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Old 14th September 2007, 10:14 AM   #17
badman is offline badman  United States
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Default Re: 1st Design!

Quote:
Originally posted by Richard Ellis
Ok , I looked up the specs on your desired drivers & yes you will need the attentuation for the tweeter as it is rather sensitive & needs the L-pad.
Do we have any response graphs available out there to nail down these anomalies in the woofer?
Perhaps you could run the Xover outboard of the enclosure so that we could tweak/modify to make up for the non-linearities.
The dirty way to do it of course is to get a twelve band EQ to tweak the response.........Oh yeah..thats' how they do it in the studio!....Plus with said EQ you could dial in the response for room acoustics also.
_____________________________________Rick.........

12 band EQ used in WHAT studio? Remind me NEVER to use their recordings. 12 band lacks sufficient resolution to accomplish any but the most basic of EQ tasks, and certainly won't do you any good controlling this breakup, as you'll attenuate the tweeter output so low that all you'll hear at that frequency is the sound of the breakup, with big dips to either side in the 1M response curve.

Nothing personal, but that's a terrible idea.
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Old 14th September 2007, 01:01 PM   #18
markr89 is offline markr89  United States
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Quote:
Originally posted by sreten


I agree, and the db616TL uses 6.5 woofers not 5" woofers.

TBH the RS150S is a good driver but not a bass monster.

/sreten.

1) i was just looking to get better sound out of the db616tl enclosures that are already half-built (i haven't yet cut out the holes for the drivers) because i had some extra money
2) the rs 150 MTM uses the 6" woofer, the rs150s.
RS125S-8 5"
RS150S-8 6"
RS180S-8 7"
3) I'm not looking for monster bass, just a well controlled low end, i plan to use these as mains in a ht system ill be building as i get more money. I am also adding a sub very soon, so most of my real low end bass will come from there.
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Old 14th September 2007, 01:36 PM   #19
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by markr89



1) i was just looking to get better sound out of the db616tl enclosures that are already half-built (i haven't yet cut out the holes for the drivers) because i had some extra money
2) the rs 150 MTM uses the 6" woofer, the rs150s.
RS125S-8 5"
RS150S-8 6"
RS180S-8 7"
3) I'm not looking for monster bass, just a well controlled low end, i plan to use these as mains in a ht system ill be building as i get more money. I am also adding a sub very soon, so most of my real low end bass will come from there.
http://users.d-web.com/dbrown/db717tl/db717tl.htm

The RS180s models well in those cabinets, the RS150S might be OK.
perhaps MJK worksheet boffins would like to comment ?

Click the image to open in full size.

Unfortunately the RS180S crossover designs seeem to like overdoing it.

RS150S :

Click the image to open in full size.

RS180S :

Click the image to open in full size.


/sreten.
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Old 14th September 2007, 08:38 PM   #20
owdi is offline owdi  United States
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Unless you have a way to measure impedance, build the enclosure sealed. Knowing the impedance of your speaker is critical in getting the stuffing right in a TL.

Even sealed it will sound good, and give you a surprising amount of bass.

Dan
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