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View Full Version : SIERRA Towers: Stock v NRT v RAAL Efficiency/Impedance Variance?


SONDEK
02-13-2013, 12:56 AM
Guys

Is there any material difference in efficiency or impedance between the three iterations of the SIERRA Towers?

Do the NRT and RAAL drivers improve ease of drive - or present a more difficult load?

Also, does the nominal speaker impedance go up (good for most SE amps) or go down (good for most PP amps) as a result of either upgrade from Stock?

This may not be a question that is too important for those with a few hundred watts to throw around, but it becomes quite critical for some of us real-world Class A enthusiasts...

I have searched this question on the forum, but have had no luck turning up an answer. Hope you can help...

:D
(Great forum!)

-SONDEK
Mag_Neato
02-13-2013, 06:20 AM
SONDEK,(Reminds me of the LINN SONDEK name!)

There are only two versions of the tower - NrT & RAAL. The standard tweeter in the Sierra-1 is only used there.

As for your other questions, hopefully Dave or someone more knowledgeable than myself will chime in.
curtis
02-13-2013, 09:57 AM
What you are looking for is listed in the specs for the Tower w/ NrT and the Tower with RAAL.

In the measurements for each, there are impedance graphs as well.

The RAAL version is 1dB more sensitive. The impedance graphs of the two, the differences seem negligible.

NrT version:
Specs
http://www.ascendacoustics.com/pages/products/speakers/SRT/srtspecs.html
Measurements
http://www.ascendacoustics.com/pages/products/speakers/SRT/srtmeas.html

RAAL version (impedance and specs are the last two pages):
http://www.ascendacoustics.com/pages/products/speakers/SRT/Ascend%20Sierra%20Ribbon%20Tower.pdf
SONDEK
02-13-2013, 12:36 PM
Perfect!
Exactly what I was after... Many thanks chaps.
-SONDEK
Veda
02-24-2013, 01:06 AM
Looking at this graph would it be safe to say the average impedance of the RAAL Tower is 4 ohm?
davef
02-24-2013, 11:11 PM
Looking at this graph would it be safe to say the average impedance of the RAAL Tower is 4 ohm?

Minimum impedance is approximately 4.5 ohm, average impedance across the bandwidth of the speaker is ~8 ohm. Nominal impedance is ~6 ohms.