The Vagrant Monitor

The Vagrant Monitor

Designer: Jay1

Project Time: 20 hours
Project Complexity: Amateur
Project Cost: $200

Driver Selection
Woofer selection is a Peerless SDS-160F25PR01-08, the tweeter is a Vifa TC7FD- 4. After seeing a set of outstanding frequency response and distortion measurements on the tiny Vifa I was very curious to try one out as a tweeter. Knowing this little full range driver was capable of crossing much lower then any dome tweeter my woofer selection allowed for a true woofer. Staying with the budget theme of the Vifa I settled on the Peerless with its high xmax and solid sealed box performance in a compact cabinet.

Enclosure Design
The box is a very simple and fairly compact sealed monitor with one quirk. The woofer is placed 1/2″ in front of the tweeter which allowed me to easily use 2nd order slopes for the crossover. I simply ran the edge of the double baffle piece through my table saw with the blade cocked 45 degrees, and then glued it over the woofer cutout. All drivers are surface mounted, as their frames allow. The box is constructed out of 1/2″ MDF, 13″ H x 9″ W x 8.5″ D. The cabinet is separated internally half way between the woofer and tweeter. Each chamber is fully stuffed with polyfill.

Amplifier/Crossover Configuration
This speaker features a 2nd order LR at 1000 hz crossover. Given the budget nature of the design I tried to keep the crossover as simple as possible. Even using all Dayton poly caps a pair of parts should only come out in the mid $30 range per speaker. Impedance makes for a very easy load, this is true 8 ohm design. Speaker sensitivity is low at 82 db, but given the capable woofer they can easily handle a 100 watt amp. The measurements shown are not a reflection of sensitivity.
(This is the measured on axis response shown with the reverse null. Below 500hz should be ignored. This is not actual sensitivity)

About The Designer
I’ve been a speaker enthusiast since 2001 and a die hard DIYer since 2011. I am 31 years old and married with a kid. I am an aircraft maintainer for the USAF specializing in structural, composite, outer mold line repairs.



Project Parts List

Peerless SDS-160F25PR01-08 6-1/2″ Paper Cone Woofer

Vifa TC7FD00-04 2-1/2″ Full Range Paper Cone Woofer 4 Ohm

Dayton Audio DMPC-18 18uF 250V Polypropylene Capacitor

Dayton Audio DNR-3.0 3 Ohm 10W Precision Audio Grade Resistor

Jantzen Audio 0.80mH 20 AWG Air Core Inductor Crossover Coil

ERSE 5.0mH 18 AWG I Core Inductor Crossover Coil

Dayton Audio DMPC-3.3 3.3uF 250V Polypropylene Capacitor

Dayton Audio DNR-2.4 2.4 Ohm 10W Precision Audio Grade Resistor

Jantzen Audio 0.40mH 20 AWG Air Core Inductor Crossover Coil

Round Speaker Terminal Cup 2-7/8″ Gold Banana Binding Post

Acousta-Stuf Polyfill Speaker Cabinet Sound Damping Material 1 lb. Bag

Parts Express Speaker Gasketing Tape 1/8″ x 3/8″ x 50 ft. Roll


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