Photo of the loudspeakers and the crossovers for the Halcyon kit.

Halcyon ~ Markaudio + SB Acoustics Full Range with Bass Assist Tower - Pair

Manufacturer: Markaudio

1 Customer Review(s)

Product ID: Halcyon

$635.00

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The Alpair 10P has been discontinued, so this kit is no longer availalbe.

Halcyon - Markaudio + SB Acoustics Full Range w/ Bass Assist Tower - Pair

High quality birch flat packs are now available for this kit through Speaker Hardware.

The Halcyon is a very unique 2-way/3-driver design featuring the Markaudio SB17NRX2C35-8 6.5" paper cone woofers. The Alpair 10P is housed in a semi open back cylindrical enclosure, while the SB17's perform in individual transmission lines that are merged at the port in a mass loaded configuration.

We are really excited about this project, & want to thank Curt Campbell for his design work and never ending contributions to the DIY speaker building community.

Specifications:

2-Way - Full Range + Dual Woofer Floor Standing Tower
38.25" tall x 9" wide x 22.5" deep
Sensitivity: 88 db
Impedance: 4 ohm
Frequency Response: 40 Hz (-3db) to 25 kHz
Crossover Frequency: 1st Order Series @ 400 Hz

Full documentation on this design can be found @ Curt's website - Speaker Design Works

Each Halcyon Kit Includes:

(2) Markaudio Alpair 10P 6" Paper Cone Full Range Drivers
(4) SB Acoustics SB17NRX2C35-8 6.5" Paper Cone Woofers
(2) Professionally Assembled Crossovers (details below)

Optional Accessories Package Includes:

(2) PSP-OFN - 2" Outside Flared Port
(18ft) Supra Classic 2.5 - 13 awg tinned oxygen free copper internal speaker wire
(3lb) Acousta-Stuff - fluff & fill transmission line (leave area around port empty)
(1) Foam Sheet - cut & line tube and rear chamber
(4) QC110B Quick Connects - for - woofer tabs
(4) QC205R - for +woofer tabs
(2) QC250B - for - full range tabs
(2) QC250R - for + full range tabs
(16) OXSOCKET8X1 - mount woofers to baffle (10P drivers already incl. socket screws)
(8) OXSOCKET6X3/4 - mount port to cabinet
(16) OX6PAN3/4 - mount crossover inside base
(1pc) Kester silver solder - solder wires to crossovers (mandatory), drivers & input cup (optional)

Discounted Binding Posts/Input Cups are also available with from the drop down menu.

Assembled Crossovers

Each crossover is professionally assembled on a Matrix Double silver plated copper circuit board. Kester silver solder is used to terminate all the parts. Being a series crossover, parts selection throughout the build is critical. The standard version of the crossover uses a Solen FastCap 150 mfd, ClarityCap PX 10 mfd, and Sledgehammer Steel Laminate 2.0 mH inductor. Basic sandcast wirewound resistors are used over metal oxide film type after extensive listening tests during the speakers development. Upgrade options from the drop down menus include higher end caps & Mundorf MResist Supreme sandcast wirewound resistors. A budget capacitor version is also available.

Alpair 10P Full Range Driver

SB17NRXC35-8-UC Woofer

Images of Completed Kit

1 Customer Review(s)

Verified Purchase

My Halcyon Build

Reviewed by davebtw on 03/18/2023

Now that my Halcyon speakers are fully broken in, and driven by top quality DAC and AMP, I am pleased with them. I purchased a flat-pack online, but had to make a few modifications to it for everything to fit. I needed a lot more stuffing to get the bass right than what was in the original shipment.

I am very surprised by how good the Alpair 10p sounds especially with the bass augmentation. I went for the upgraded caps in the crossover which I am sure has helped with transparency and lack or congestion in the treble and upper mids. Also I upgraded the bass inductor but I am not sure it made much difference.

These speakers are good enough to show upstream problems and distortion, and seem quite sensitive to component quality as mentioned by the Designer Curt Campbell.

It took me many months to build and finish. and I didn't create a fancy cabinet or finish. I also bi-wired the drivers and placed the crossover into the base unit. This was done so I can experiment in the future with electronic crossovers.

I use them for listening in my audio lab with background music as well as auditioning new HI-Res files I have downloaded. They are easy on my ears, and very pleasant to listen to.