FUSION 3
Copyright 2018 © Troels Gravesen

Link to FUSION for cabinet and driver details

Link to FUSION-BAD

 CROSSOVER    DRIVERS    CABINET   CROSSOVER LAYOUT    SPEAKER-KIT    SOUND

This page describes the third version of the FUSION speaker. We here have a Hypex FUSION FA252 plate-amp with DSP and two power amplifiers, one running the bass driver, the other running the mid-tweeter section with a simple crossover between the two. The benefit of this is two-fold, you don't need any power amplifier and we can omit the midrange high-pass section, which saves us a lot of expensive capacitors. Below you see what's going on:

The Hypex software comes on a memory stick together with the Hypex modules from Jantzen Audio and contains the low-pass filter in three gain settings to adjust to your pre-amp, streamer, etc. with a volume control and line output, being either single ended or balanced. Most likely you will have RCA sockets (phono sockets) and you need a pair of cables going from single ended (SE) to balanced (XLR) as seen below. The XLR plugs must be male XLRs like seen below.

Hypex FUSION plate amp/DSP


Click images to view large

Download HYPEX FUSION manual here.

Download Hypex Filter Design here.
Go to page 31 to read about the FUSION modules.

Download Hypex Filter Design 4.71 software from Hypex website.

More on FUSION FA252 programming HERE.

DRIVERS
Back to index


Click images to view large

Download specs: SNAcoustics TW29RN-B    ScanSpeak 18M/8631T00   BMS 12N630


CABINET: Go to FUSION for details
Back to index


CROSSOVER
Back to index


Above the very simple mid-tweeter section providing the low-pass section for the midrange driver and high-pass section for the tweeter.
Another advantage of this is the we can tune this as high as the midrange driver allows and not having any resister in series with the driver as we can adjust gain of the amplifier running the mid-tweeter section to match the 12" bass driver.
Basically the mid-tweeter section is tuned to 90 dB sensitivity (2.8V/1meter).


Above the response of bass, mid-tweeter and summed response. Not included is the contribution from the ports.


CROSSOVER LAYOUT
Back to index


I'm having an extra resistor for R1 to try out different tweeter levels.


Place the crossover on rear panel above the ports.

As the HYPEX software comes with channel 1 inverted polarity, connect the midrange driver with positive polarity and tweeter with inverted polarity.


The HYPEX FA252 mounted on rear panel. Note the speaker terminals are no longer used here.
Connect channel 1, red (PLUS) and black wire (MINUS) to crossover board. Connect from channel 2 blue (PLUS) and grey (MINUS) to bass driver.

 

Speaker wiring


Note tweeter connected with inverted polarity!


SPEAKER-KIT
Back to index

You can buy the kit with or without the drivers - or some of the drivers if you already have some.
You can use the SBA Beryllium TW029BN-B dome (4 Ohm version) without changes to crossover.
Please ask Jantzen Audio for options.


Should you want to make the front grille, order 2 sqm cloth in the colour of your taste.
Also order grille pegs and grille catchers. See Jantzen Audio website for options or order neodym magnets on eBay.

The 8 Ohm bass driver can be had from various sources, e.g.:
http://www.lean-business.co.uk/eshop/bms-12n630-12-600-watt-neodymium-speaker-8-ohm-p-2566.html (217 £)
https://www.thomann.de/de/bms_12n6308_ohms.htm?ref=search_prv_6 (246 €)
Both very reliable dealers to my experience.

All kit and component prices may be subject to change and are always to be confirmed by Jantzen Audio Denmark.

Go to Jantzen Audio website for purchase

Download Complete Kit Sale Presentations (pdf file):

The kit includes the Hypex software on a memory stick.

All technical questions to troels.gravesen@hotmail.com

All questions regarding purchase of kits, please mail Jantzen Audio at contact@jantzen-audio.com

 


SOUND
Back to index

With my Anthony Wilson 45 rpm Jack Of Hearts on the platter, precision and clarity from a pitch black background was what came to mind firing up the FUSION-3. This LP cut by Bernie Grundman (link to YOUTUBE interviews) is a phenomenal recording, and in particular I was surprised by the clarity and transparency of the midrange and treble.
After some fine-tuning of treble level - the usual procedure - things fell into place and I could fully enjoy the sound of these NCORE Hypex modules that truly puts my tube affection to test. I'd say these Hypex modules are closer to very good solid state amplification than tubes and in the end it's all a matter of taste. The convenience of this construction is hard to ignore. Line stage or any receiver, DAC or streamer/network-player with volume control - and you're running. No power amplifier required!