Crites CS-1 And CS-1.5 Speaker Project

This is an interesting and simple to build project.  We sort of fell into this one by accident.  We were testing our new CW1228 woofers in a Heresy 1 box.  This new woofer was built to be a replacement for the woofers in the Heresy and Heresy II.  In those, the woofer needs to go up to 700hz and from that point the midrange comes in to handle the range up to 6000hz and then the tweeter takes over.  

Our testing was to verify that the woofer could make it up to 700hz making it a good replacement for the K-22 or K-24 woofers in the Heresy 1 and 2 speakers.

Well, It easily does 700hz in those boxes, and just keeps right on going higher.  That started me thinking.  All you have to do is make it up to about 1200hz or so, and then you can get a pretty inexpensive driver to take over there and go on all the way to near 20khz.  

Since I already had a couple of empty old Heresy cabinets, I started looking at horns and drivers that could make those cabinets into 2-ways using the new CW1228 woofers.  Pretty soon, I found the Selenium D220Ti drivers and the Selenium HM25-25 horns.  I bought a pair of each and started testing.  

Preliminary tests looked good, so I cut out a hole where the old tweeter and midrange horns were in the old Heresy cabinets large enough to put the Selenium horn in.  No attempt was made to make these pretty, they are just test mules to work out how the parts work in this rig.

Crites CS-1 Prototypes

CS1pair

The crossover was the next thing to work on.  We went through a few designs and settled on a 4th order for the woofer and a 2nd order for the HF driver.

Here is the curve we got on the speaker after tweaking in the crossover design.

csxo4th2nd9db

This may be small and a bit hard to read, but we got a good response from about 55hz to about 19.3khz at about plus or minus 3db. 

Like the Heresy, these will not produce low bass.  The cabinet is just too small for that.  If you want low bass, you have to go to a large cabinet and I suggest our Cornscala project for that.  But these do sound really good and are a nice small package.

So, if you want to build these, an old pair of Heresy cabinets would be one place to start, or, this is a very simple cabinet.  Building these would probably be as easy as a speaker building project could be.

The cabinet is a sealed box with these internal measurements.  Internal is what matters because we have to get the right volume for the woofer to work right.  Remember to add the thickness of your material to these measurements to get the exterior measurements.

Height 19 7/8 in.


Depth 12 in


Width 14 in.


Internal volume 3339 cu. in. or 1.93 cu. ft.

You can vary these measurements a bit if you want as long as you maintain the 1.93 cu. ft internal volume.  Of course, you can't vary them much because, as you can see from the picture, the horn and woofer take up almost all the front.  And you have to consider how deep the cabinet has to be to make sure the horn and driver have room to fit between the front motorboard and the back of the cabinet.

Parts you would need are:

Pair of CW1228 woofers  $200.00

Pair of Selenium D220Ti 16 ohm HF Drivers $98.00

Pair of Selenium HM25-25 Horns   $48.00

Pair of CS1 crossovers  $200.00 (This is the original on a 6 X 10 cedar board which is meant to mount inside the cabinet and have input wires going from the input terminals on the back of the cabinet to the crossover.)

Pair of NEW STYLE CS1 Crossovers $230.00

We can ship all that to most places in the US (lower 48 states) for $60.00 by UPS. Customers in Alaska, Hawaii or Puerto Rico or other countries, please contact us for a shipping quote.

All these parts are in stock except the crossovers which we would build when you order.  Usually we can ship those within a couple of days.

CS-1 CABINETS

We can cut out a complete set of the cabinets for the CS-1 for $200.00.  This would be just all the pieces cut but not assembled to build a pair of cabinets.  

For just a pair of the CS-1 motorboards, we can do those for $100.00.

We would need to build a wooden crate to ship the cabinet parts by UPS in the US or Canada.  Contact us with your zip code for a shipping quote.

UPDATE Dec 3, 2010

We have now built a pair of the CS-1 cabinets.  These won't win any beauty contests since they are just made of MDF without any finish on them.  But, this allowed us to put a design into our CNC Router for building these speakers and we are now able to have a drawing you could use if you want to build your own cabinets.  

cs1a

Here is a link to the plans for this cabinet.

CS1 CABINET


UPDATE July 12, 2011

Now we have done a revision to the CS-1 design.  The original is still available, this revision is just added.  We call it the CS1T indicating a tractrix horn is now available for the HF in this speaker.  The volume of the speaker remains the same, but we have had to increase it's height (and correspondingly decrease the depth) slightly to accommodate the larger Tractrix HF horn.

Parts you would need are:

Pair of CW1228 woofers  $200.00

Pair of Selenium D220Ti OMF HF Drivers $100.00

Pair of Selenium Faital Pro LTH102 Tractrix Horns $135.00

Pair of CS1 crossovers  $200.00 (This is the original on a 6 X 10 cedar board which is meant to mount inside the cabinet and have input wires going from the input terminals on the back of the cabinet to the crossover.)

Pair of NEW STYLE CS1 Crossovers $230.00


We can ship all that to most places in the US (lower 48 states) for $70.00 to $90.00 by FedEx. Customers in Alaska, Hawaii or Puerto Rico or other countries, please contact us for a shipping quote.

All these parts are in stock except the crossovers which we would build when you order.  Usually we can ship those within a couple of days.

CS-1T

CS1T

Here are links to plans for the CS-1T Cabinet

CS1TPG1

CS1TPG2

Now for something very interesting.  The CS-1 sounds great and could be even better with bass extended a bit lower.  Here is result of that idea.  We made the CS-1 cabinet larger (taller) and ported it.  

CS-1.5

cs15

This larger ported version of the CS-1, the CS1.5 uses exactly the same drivers, horn and crossover as the standard CS-1.  In this picture, the crossover is setting on top of the speaker.  This was done just to make it easier for testing the speakers drivers individually.  Yours would probably be inside.

Here are links to the plans for the CS-1.5 cabinet.

CS15PG1

CS15PG1

Bass is improved and solid down to around 40hz compared to around 55hz with the CS-1.

PORTS for the CS-1.5

The ports for the CS-1.5 are $2.00 each.  4 would be needed for a pair of the CS-1.5.

CS-1.5 CABINETS

We can cut out a complete set of the cabinets and grill frames for the CS-1.5 for $300.00.  This would be just all the pieces cut but not assembled to build a pair of cabinets.  

For just a pair of the CS-1.5 motorboards, we can do those for $150.00.

Assembly of the cabinets would be $50.00

Complete set of CS-1.5 cabinets made from Russian Birch with all internal parts assembled and tested with the new style crossovers:  $934.00

We would need to build a wooden crate to ship the cabinet parts by UPS in the US or Canada.  Contact us with your zip code for a shipping quote.



UPDATE Jan. 19 2012.

To extend the idea of the tractrix horn used in the CS-1T to the CS-1.5T, here is the info on that.

Just to repeat the internal parts:

Pair of CW1228 woofers  $200.00

Pair of Selenium D220Ti OMF HF Drivers $100.00

Pair of Selenium Faital Pro LTH102 Tractrix Horns $135.00

Pair of CS1 crossovers  $200.00 (This is the original on a 6 X 10 cedar board which is meant to mount inside the cabinet and have input wires going from the input terminals on the back of the cabinet to the crossover.)

Pair of NEW STYLE CS1 Crossovers $230.00

Ports used in the CS1.5T are $2.00 each, 4 needed.


CS-1.5T CABINETS

We can cut out a complete set of the cabinets and grill frames for the CS-1.5T for $300.00.  This would be just all the pieces cut but not assembled to build a pair of cabinets.  

For just a pair of the CS-1.5T motorboards, we can do those for $150.00.

Assembly of the cabinets would be $50.00

So, total for complete set of cabinets made from Russian Birch with all internal parts assembled and tested with the new style crossovers:  $1023.00

Here are links to the plans for the CS-1.5 cabinet.

CS15TDRG1

CS15TDRG2

CS1 and CS1.5 Crossovers

cs1.5tnew

CS-1.5T CABINET

cs15t


Here is just the CS-1.5T MOTORBOARD

cs15mb



Australian CS-1s  

Thought I would show a few pictures from a recently completed set of 3 CS-1s.  These were made by John in Australia.  I think he did a great job.  I always like to see the innovations that different builders use in these projects.

DSCF0482

DSCF0486

DSCF0488

DSCF0492


B & K Sound, 1925 East Gum Log Rd. Russellville, AR, 72802 phone-479-967-1542