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F&B KG315 KRAKEN TL-PR Acoustic Line
30–2000 Hz Single-Driver Full-Range TL–PR Hybrid System
I designed and built a unique single-driver full-range TL–PR hybrid loudspeaker system using KG315 PVC fittings. The heart of the system is the SB Acoustics SB20FRPC30-8 full-range driver, complemented by a folded Transmission Line with a 107.5 cm acoustic centerline. For extended low-frequency performance, Dayton Audio DSA215-PR passive radiators are used.
One of the most important characteristics of the design is that it uses no conventional crossover or cross-over network. This eliminates the need for the electrical crossover typically used in multi-way loudspeakers, avoiding the associated phase and time-alignment compromises around the crossover region.
The large cross-sectional area and rigid KG315 PVC acoustic path, together with 12 mm internal acoustic felt damping and the carefully matched TL–PR system, create a design in which the low-frequency response extends well beyond what the SB20 could achieve on its own. The PR system is tuned to approximately 31.7–32 Hz, gradually taking over in the deepest bass region.
Main design objectives
natural and direct single-driver full-range reproduction
avoiding phase and crossover-related problems
a large, unobstructed midrange
deep and controlled bass response
reduced cabinet coloration and unwanted resonances
low coloration and a coherent sound character
a unified sound source based on a single main driver
The system has been designed for a usable acoustic operating range of approximately 30–2000 Hz, where the full-range character of the SB20 and the TL–PR low-frequency section complement each other.
This is not a conventional loudspeaker enclosure, but a custom-developed KG315 PVC Transmission Line–Passive Radiator hybrid system, designed to achieve the most coherent, natural and musical reproduction possible.
If anyone is interested in the detailed technical background of the project, I can provide the complete PDF documentation, including the detailed construction dimensions, acoustic and engineering calculations, TL–PR system analysis, and specifications of the components and materials used.

These are very good tweeters for such a small outlay, The service Willys gives is top notch. Thanks Willys

Great service. Pre wired my new tweeters.
So helpful on the phone.
Just in a league of his own.

Great product and really quick turn around from purchase to delivery which was vital as my previous option I used could t get the product for.months on end

A great fix for my mk1 ATC SCM40’s which had gone a bit dull. Easy to unclip the drive unit from the plastic waveguide which wasn’t needed and a little bit of packing out required as the magnet fins are about 4mm less deep on this newer version, but a super easy diy fix….. from the outside you’d never know they’ve been replaced and I have my top end back now. Smooth and speedy delivery as well. Very pleased all round.

super

Excellent service….as always, many thanks!

Upgraded tweeter and crossover for my mission 753. Improved upper and mid range.
Not much change on bass. Overall happy with the performance.

After waiting a couple of days, the speakers are playing properly again!
Thank you so much 👍

So easy to open and replace the tweeters with just a little soldering. A must for anyone who has the speakers. I’m listening to classical jazz and rock so the speakers are still smooth but more detailed

Excellent replacement for my Mission 733i woofers.The originals developed cracks over time which become detrimental to the sound.I first replaced these with second hand originals , but they soon went the same way as it’s was a poor choice of material used by Mission.Great service from Willys and easy to install and definitely sound great if not better than originals.

Arrived very well packed - Used in simple 300hz crossover for some large horns.
A 3d printed base custom made to nest the components.
I used REW to verify that the actual frequency of the final unit - Perfect.

Great capacitors fit perfect

Have upgraded mission 753's with HFLM2 replacements. The speakers are born again with added exuberance and excitement. The difference in sound is amazing from these wonderfully high performing speaker's.

Recommended to buy these resistors by Colin from EJ Jordan for a speaker build with old Electrofuidic speaker cabs. Now fitted and doing the job for which they were intended.
Delivered promptly and well packaged.

Excellent again thanx

Items were dispatched quickly and fitted perfectly. Very happy.

The metal oxide (MOX) resistors 2.7 Ohms 10W were a good upgrade from the OEM ceramic 7W part on the crossover board.
I did have to drill another PCB through-hole along the copper track to relocate a tweeter wire away from the physically longer replacement to avoid probable short circuit outcome at the original hole.
Overall very pleased to have it in place complementing the Solen capacitor upgrades also in place (+/-2% tolerance verified).
Upgrade applied to Wharfedale Diamond 9.1 speakers.
Net Result: Immediate improvement.

Very helpful response to my initial email. Once ordered the tweeter was extremely well packed & sent quickly - a with tracked courier service.

A perfect replacement for my Spendor SP 2-2 units. Many thanks

Sounding superb but they will get better after some hours burn in.

Sounds superb, installed in a Jadis JP200 clone.

Prompt and very friendly service. Received the items straight away. I have yet to set everything up and test the speakers (Dayton BST-1) but leaving this review for customer service, as Will and Caroline give their business a ‘family’ feel. The experience reminds me of how online shopping used to be before the likes of Amazon etc. Thanks Will and Caroline, great service.

Electrolytic caps in my RTLs were aged and reading well over nominal values. Replaced all with Monacor MKPs and considerably improved my favourite loudspeakers.

This was bought to upgrade the ongoing restoration of my Realistic MACH2 speakers. I have previously bought a Dayton 15 inch woofer and top of the range ScanSpeak Tweeter and larger Bass port .
I was very pleased with the sound , but wondered if I could improve the sound even further so purchased this Dayton audio crossover unit. It replaced a crossover unit that I previously bought off Amazon, which was a Durlo 3way .
What a great upgrade this was , instant improvement on Bass and smoothness . Highly recommended.

Arrived fast and is exactly as described