I wish you all a Merry Christmas and a Happy new Year!
Thank you all for your donations, interesting e-mails and the encouraging support of the AudioExcite Loudspeaker Design website.
I will try to publish more measurements, loudspeaker designs and other related stuff the next year, but with a regular full time job besides AudioExcite, it’s a challenge to find the time to do it all.
I will try my best!
Best regards
/Göran
This time on the test bench we have the ScanSpeak 18W/8545 mid-woofer from the ”Classic” series.
The two tested driver units are the 18W/8545-01 and the 18W/8545-00. The -01 version replaces the soon to be discontinued -00 version.
Measurement details for the two different mid-woofer versions can be found here:
(click on picture to zoom)
Left driver in picture: 18W/8545-00 (old version)
Right driver in picture: 18W/8545-01 (new version)
The new version claims to be an improved version of the old 18W/8545 and even though the measurements shows slightly better frequency response and distortion profile they are more similar than different from each other.
The -01 version has a new chassis that allows larger screw fasteners to be used. The old -00 version only allowed screws of 3mm in size.
(click on picture to zoom)
Left driver in picture: 18W/8545-00 (old version)
Right driver in picture: 18W/8545-01 (new version)
The new -01 version has a new spider material compared to the -00 version, but the magnet size chassis shape etc. are the same.
The -01 version has about 8% higher resonance frequency compared to the -00 version and slightly higher Qts. Both will work satisfactory in the same enclosure volume and bass-reflex tuning.
Blue: 18W/8545-00 (old version)
Green: 18W/8545-01 (new version)
Besides the difference in resonance frequency the impedance plot is virtually identical.
(click on picture to zoom)
Left: Frequency response on-axis (Blue= -00 version, Red= -01 version).
Right: Frequency response 15deg off-axis (Blue= -00 version, Red= -01 version).
Slightly higher sensitivity and extended frequency response for the -01 version compared to the -00 version.
Depending on the cross-over design, the new -01 version can most likely be a drop-in replacement for the -00 version.
Measurement details for the two different mid-woofer versions can be found here:
Hi Goran,
The sequences-two are beautiful, airy, accurate. World class. TOP. During the first phase of listening, my son who is a pianist was impressed.
Small but great sound. It’s absolutely wonderful.
Really thank you.
Axel