Ghibli

2-way standmount loudspeaker 6"+1"

Drivers: SB Acoustics Satori MW16P-4 a Scan Speak D3004/66000
Cabinets: net volume 18l for the woofer, BR
Sensitivity: ~86dB/2.83V/1m
Impedance: nominal 4Ω, minimal 3.8Ω at 170Hz
Freqency -3dB: 48Hz

This loudspeaker was created in parralel with Jurko project (MW16P + TW29RN), though it was finished much later and I did not have a chance to compare them side by side.

Since its introduction to the market, MW16 attracted the attention, was discussed on forums and a lot of 2-way projects were made. Before engaging to this project, I studied Khalasan and Kairos projects, and also available 3rd party measurements for MW16. All of it showed this driver can be easily crossed over at 2kHz with simple crossover. This required quite capable tweeter, I wanted to try SS6600 for a long time, so it was obvious choice. 6600 has very low distortion which does not raise steeply around 1000Hz so it is very suitable for 2000Hz LR2. Check Hificompass measurements of that tweeter.

Front baffle was tilted backward to align acoustic centers of the drivers and to allow for LR2 crossover.

Though I did not listen to Jurko and Ghibli side by side, after other projects with Scan Speak and Satori tweeters, I feel there is clear difference between them. Satori tweeters seem to be more gentle, forgiving and smooth, they are easy to listen for a long time, they seem to soften the edges. I generally like slightly declining overall FR, but for Satori tweeters it can be actually slightly rising FR, or just lifted top end. This gives Satori sound more sparkle. this of course depends on personal preferences. SS6600 on the other hand, is sharper and has more grip, and to make it easy to listen even at higher listening levels I usually need to decline overall FR. It seems to be brighter and to have more top end sparkle.

SS6600 H 0-90deg

MW16P H 0-90deg

Crossover modelling

Crossover modelling is done with measured responses for all drivers at reference axis. Mic distance 1m. Midwoofer response is merged nearfield and farfield measurement, NF contains also port contribution and bafflestep.

Measurements

Measurement was done with finished loudspeaker, to verify complete assembly. Mic distance 90cm, no smoothing applied.

Horizontal FRs 0-90deg, axial response contains also NF measurement.

Axial FRs for left and right loudspeakers.

Axial FR with (red) and without (green) the grill.

Measured step response..

NF measurements of midwoofer and port with the crossover.

Impedance of both loudspeakers. Minimal impedance is 3.8Ω at 170Hz.

Project documentation

Crossover is parallel and schematics is below. Crossover BOM contains Jantzen part numbers for some components.

Tweeter level options, R1 value can be changed according to your taste. Graph legend shows R1 value.

Cabinet drawing is below. Material is MDF 19-22mm. Net volume is slightly below 18l and port tuning is 40l. Port inner diameter 50mm, length 140mm, it is recommend to verify port tuning by measurement, and I also recommend to experiment with port length, which changes bass response. Recommended port is Jantzen 50/185 (051-0013), it is needed to trim it to achieve required tuning.

Damping material is shown below on the right in red (Basotect 30mm - foam material with open cell structure).