7" Driver advise

fantfool · 07:36 PM

I am looking to pair either the Seas ER18RNX or the Dayton RS180 in a 2 way MTM configuration with the Seas 27TDFC. I want to make sure that I end up with well articulate midrange and lower mids, not as concerned about low end as I have a sub. Any advice?

Michael Chua · 23rd January 2010, 08:18 PM

I have both these drivers with the Seas 27TDFC. The Seas ER18RNX is superior to the Dayton RS-180. You will get much better mids with the ER18 but it does cost more.

You can check them out at:
ER18RNX at STARLING
RS180 at MERLIN

Personally, 7" is rather large for a MTM. My preference is 5-1/4". You may want to consider ZA14 instead.
ZA14 at SWIFT

Regards
Mike

fantfool · 23rd January 2010, 08:30 PM

How do you mean 7" is too large for MTM? Please explain.

DcibeL · 23rd January 2010, 08:45 PM

It has already been designed for you!

Seas ER18RNX / 27TDFC MTM

Michael Chua · 23rd January 2010, 09:20 PM

Quote:

Originally posted by fantfool
How do you mean 7" is too large for MTM? Please explain.

To maximize the benefits of a MTM, you want to keep the center to center distance between the woofer and the tweeter to the wave length of your intended crossover.

A larger woofer means this distance is longer. You will now have to cross over at a lower frequency.

In the link posted by DcibeL, note the crossover is set at a very low corner frequency. 1.65kHz at 12dB/oct is demanding a lot from a tweeter. Compression drivers are comfortable from 1kHz to 2kHz. Not tweeters.

DcibeL · 24th January 2010, 01:10 AM

27TDFC is perfectly happy with this crossover point, as are some other regular dome tweeters.

fantfool · 24th January 2010, 01:16 AM

I thought the Seas tweeter would be ok there. Another point is I think the RS180s would be happier in a larger enclosure as opposed to the Seas 7" looks like it likes a smaller enclosure.

Elbert · 24th January 2010, 02:28 PM

I would recommend taking a closer look at the new SEAS U18RNX/P.

THE ART OF SOUND PERFECTION BY SEAS - H1571-08 U18RNX/P

The new SEAS kit, "Idunn" provides a good case study of what this driver can do:

THE ART OF SOUND PERFECTION BY SEAS - Idunn

If I hadn't already forked out on a pair of W17CY-001 ,the U18 Would definitively have been my choice as it seems to have a lot of the EXCEL series qualities, but more moderately priced and a very smooth frequency response making it easy to work with.

fantfool · 24th January 2010, 06:19 PM

I'm really thinking of going with the Modulas, good established design less expensive drivers though more expensive x-over, but MT or MTM? I just don't think I would be happy with the output of the MTs....

23rd January 2010, 07:08 PM	#1
fantfool diyAudio Member Join Date: Dec 2007	7" Driver advise I am looking to pair either the Seas ER18RNX or the Dayton RS180 in a 2 way MTM configuration with the Seas 27TDFC. I want to make sure that I end up with well articulate midrange and lower mids, not as concerned about low end as I have a sub. Any advice? Last edited by fantfool; 23rd January 2010 at 07:36 PM.

23rd January 2010, 08:18 PM	#2
Michael Chua diyAudio Member Join Date: Jul 2006 Location: Calais, ME	I have both these drivers with the Seas 27TDFC. The Seas ER18RNX is superior to the Dayton RS-180. You will get much better mids with the ER18 but it does cost more. You can check them out at: ER18RNX at STARLING RS180 at MERLIN Personally, 7" is rather large for a MTM. My preference is 5-1/4". You may want to consider ZA14 instead. ZA14 at SWIFT Regards Mike __________________ AmpsLab.com

23rd January 2010, 08:45 PM	#4
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	It has already been designed for you! Seas ER18RNX / 27TDFC MTM __________________ The power of Science compels you!

24th January 2010, 01:10 AM	#6
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	27TDFC is perfectly happy with this crossover point, as are some other regular dome tweeters. __________________ The power of Science compels you!

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23rd January 2010, 08:30 PM	#3
fantfool diyAudio Member Join Date: Dec 2007	How do you mean 7" is too large for MTM? Please explain.

24th January 2010, 01:16 AM	#7
fantfool diyAudio Member Join Date: Dec 2007	I thought the Seas tweeter would be ok there. Another point is I think the RS180s would be happier in a larger enclosure as opposed to the Seas 7" looks like it likes a smaller enclosure.

24th January 2010, 02:28 PM	#8
Elbert diyAudio Member Join Date: Mar 2008	I would recommend taking a closer look at the new SEAS U18RNX/P. THE ART OF SOUND PERFECTION BY SEAS - H1571-08 U18RNX/P The new SEAS kit, "Idunn" provides a good case study of what this driver can do: THE ART OF SOUND PERFECTION BY SEAS - Idunn If I hadn't already forked out on a pair of W17CY-001 ,the U18 Would definitively have been my choice as it seems to have a lot of the EXCEL series qualities, but more moderately priced and a very smooth frequency response making it easy to work with.

24th January 2010, 06:19 PM	#9
fantfool diyAudio Member Join Date: Dec 2007	I'm really thinking of going with the Modulas, good established design less expensive drivers though more expensive x-over, but MT or MTM? I just don't think I would be happy with the output of the MTs....

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