7" midbass and 1" tweeter for 60$ and 30$, what about SEAS? - diyAudio
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Old 16th July 2007, 09:30 PM   #1
Bricolo is offline Bricolo  France
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Default 7" midbass and 1" tweeter for 60$ and 30$, what about SEAS?

Hi all,

I'm considering a floorstander project, with a 7" midbass and a 1" tweeter. Budget for the drivers is about 60$ and 30$ each, respectively.

My focus is on a 2 way, with well behaved drivers. Something like a paper based midbass (could also be poly, coated paper, etc) that does not need a lot of compensation, and a fabric tweeter.

The enclosure would be a floorstander, possibly a TL or MLTL but I can go for a bass reflex if I run in too much trouble with the first ones.

I'd like to try active XO, that could make things easier for the bafle step compensation. So the sensitivities do not need to be matched, that's not a problem since they will be adjusted in the filter.


For this budget and use, what do you think of the SEAS units? My choice goes towards those:
CA18RNX H1215
http://www.seas.no/Prestige%20Basser...X-H1215-08.pdf
or the new
ER18RNX H1456
http://www.seas.no/Prestige%20Basser...X-H1456-08.pdf

tweeters one of those
27TDFC H1189
http://www.seas.no/Prestige%20Diskan...C_1189ny06.pdf
or the new (although I'm not found of the grill)
27TDFNC/GW H1462
http://www.seas.no/Prestige%20Diskan...C-GW-H1462.pdf

Probably crossed between 2 and 3kHz, 2nd order or 2nd/1rd (subtractive?)


The 6.5" have been tested here with good reviews
http://www.zaphaudio.com/6.5test/

The "old" tweeter is shown here
http://www.markk.claub.net/Testing/T...comparison.htm




So, what do you guys think about those parts? Are they a good choice for the price or is there anything better I should consider?

Regards
Alex
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Old 16th July 2007, 09:42 PM   #2
Jay_WJ is offline Jay_WJ  United States
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Among the drivers you listed, I'd choose ER18RNX and TDFC. John Krutke is actually working on a crossover for his design that uses these drivers.

For a 2-way, Peerless HDS Exclusive 7" and HDS 1" tweeter will be another great combo.
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Old 16th July 2007, 09:58 PM   #3
Bricolo is offline Bricolo  France
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Nice to know that one of the "big guys" is working on those

Are you aware of any direct comparison of the SEAS and the Peerless? How do they compete, is the HDS woofer fine despite the big peak around 4k?
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Old 17th July 2007, 04:57 PM   #4
Bricolo is offline Bricolo  France
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other opinions?
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Old 17th July 2007, 06:24 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

TBH you would likely be better off with a simple passive crossover and
active BSC / bump corrections at line level, possibly passive line level.
Extra 4dB to 5dB dynamic range midrange to top end at a stroke.

/sreten.
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Old 17th July 2007, 08:36 PM   #6
Bricolo is offline Bricolo  France
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well, I hope I can get a pair of nice amps for a fair price. that's why I could try active xo
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Old 17th July 2007, 08:52 PM   #7
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Madisound have the grille covered version of the 27TDFC (the 27TDFC/G) on sale for $27 at the moment.

David.
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Old 17th July 2007, 08:55 PM   #8
Bricolo is offline Bricolo  France
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well, the grill is one of the reasons I'm not so enthusiastic about the new tweeter
I didn't even know there was a 27TDFC WITH grill
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Old 18th July 2007, 11:56 AM   #9
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Here's the link to the 27TDFC/G at Madisound incase anyone is interested:

http://www.madisound.com/catalog/pro...6439f435c77265

It was listed in the car audio tweeter section (by mistake). I've ordered 2 to see how they compare and whether they are drop in replacements for the 27TBFC/G.

The main difference is efficiency. the 27TBFC/G is on average 1.5dB more sensitive. minor L-Pad adjustments can be made to the design I am working on such that crossover redesign isn't required.

I'll let you know how I go.

David.
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Old 18th July 2007, 11:56 AM   #10
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by Bricolo
well, I hope I can get a pair of nice amps for a fair price. that's why I could try active xo

Hi,

IMO best used in a 3 way with active bass to mid and passive
mid to treble including as before line level response shaping.

Something like this - but modified as above :

http://www.rjbaudio.com/AlpheusMkII/alpheusmkii.html

/sreten.
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