133 Dalmeny Drive, Prestons NSW 2170, Australia +612-96074650 & 0412-203382

  JLTi Oppo Player        CD & DVD Player Upgrades        JLTi Tube Amps   


Home
World-Wide Distributors
JLTi BDP Oppo Player
Oppo Level 4 Details
JLTi Phono - Back Again
JLTi EL34 & KT88 Amps
JLTi Yamaha CD/SACD
What is Terra Firma?
CD/DVD Upgrades FAQ
Contact Us
Elsinore Speakers DIY
Elsinore Project Kits
JLTi EL34 Wins Shootut
About Joe Rasmussen
JLTi Interconnects
JLTi Review & Comment
Tubes & The Gainclones
DIY Tube Gainclone
Joe's FVP Page
Joe's Equipment Photos
Fletcher-Munson Curves
Joe's Photos
TODAY'S SPECIALS
Real Vs False Claims?

 

Part Five

Internal Wiring & Box Damping

INCORRECT WIRING OR PHASE WILL

SERIOUSLY DEGRADE PERFORMANCE


INCORRECT WIRING OR PHASE WILL

SERIOUSLY DEGRADE PERFORMANCE

Above two drawings show the suggested way. The internal wiring as shown and the crossover built into a smaller box of its own (not drawn to scale). Red is Positive and Blue is Negative.

Must use battery to make sure you have gotten the polarity right!

See Battery Check above



As can be seen, there are five pieces of damping material. These were Wool 60% and Dacron (polyester fibre) 40%. This has a low density. If you can source this material, used as insulation bats, but if other types of insulations bats are used, you may still use above as guide, but some experimentation may be required. Do not use excessive amount nor material that is too dense. Also use some suitable glue to hold into place.

The Wool/Dacron bats were cut into the following shapes/sizes:

2 x 1200mm High, 160mm Wide and 25mm Thick. Used as Front Damping

1 x 850mm High, 110mm Wide and 75mm Thick. Used as centre Rear Damping

2 x 1100mm High, 50mm Wide and 75mm Thick. Used as corner Rear Damping

The above pieces can be fitted after the box assembly is finished, through the 6.5 inch driver holes.

If denser material is used, then reduce thickness to less than 75mm in the rear of the box.

More recently being using this:

PolyMax Thermal & Acoustic Batts R.30

 

Sydney Supplier: Bevan Buksin 0412-143495

Made by PolyMax, 4 MacDonald Road, Ingleburn NSW 2565, Australia

Call or email them for your closest supplier: 02-9829-2299 & admin@martini.net.au

--------------------------------------

Next: Construction Photos

 

Total Design Responsibility, Joe Rasmussen of Custom Analogue Audio & JLTi

Part Financial Sponsor & Prototype Box Construction, Bernard Chambers of Sutherland

Sounding Boards, Michael Lenehan of Lenehan Acoustics & Brad Serhan of Orpheus Loudspeakers


 

Send mail to joeras@vacuumstate.com with questions or comments about this web site.
Copyright 2003-10 Joe Rasmussen & JLTi
Last modified: Monday June 08, 2015

Just had a terrible thought. If "intelligent design" is unscientific, then who will design our audio equipment?