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Multi-Way Conventional loudspeakers with crossovers

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Old 25th June 2012, 06:32 PM   #21
bug2k11 is offline bug2k11  United Kingdom
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I used the Dayton Audio DATS tester with the driver clamped upright on a bench (there was a couple of metres of free air around it).

There seems to be quite a few drivers with 177mm outside diameter.
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Old 25th June 2012, 06:52 PM   #22
bug2k11 is offline bug2k11  United Kingdom
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Here's some pictures showing the back and a larger front picture.

Rear View

Front View
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Old 25th June 2012, 07:04 PM   #23
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You know I'm sure I've seen a basket design that looks like the rear of that before, specifically the casting around where the screw holes/flange are, it isn't Audax, but I cannot quite remember what, either that or I am remembering incorrectly!
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Old 25th June 2012, 07:22 PM   #24
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Quote:
Originally Posted by bug2k11 View Post
I used the Dayton Audio DATS tester with the driver clamped upright on a bench (there was a couple of metres of free air around it).
You will likely need to actually test any replacement drivers with the same kit to get numbers that can be compared.

The manufacturers data is (almost universally) done using LEAP or LMS at much higher driver levels -- which, unless the driver has flat T/S curves, means a different set of numbers, sometimes dramatically so.

dave
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Old 25th June 2012, 11:10 PM   #25
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the SEAS CA18RLY might be suitable:
H1217-08 CA18RLY
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Old 26th June 2012, 01:59 AM   #26
system7 is offline system7  United Kingdom
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As Planet10 (Dave) says, the Chester is a paper cone.

Quote:
Carbon fibre Castle
Not one, not two, but three hew loudspeakers have been recently introduced from Castle - the Avon, the Eden and the Keep. The newcomers complete Castle's 1996/97 range and introduce its first foray into the. audio-visual arena. The Avon replaces the Chester and, together with the Eden, brings carbon fibre technology to the Castle range for the first time. This two-way, floor-standing design employs a 165mm bass/midrange newly developed by Castle.
Review | Carbon fibre Castle | Page172 - November1996 - Gramophone Archive

I stand corrected. Crossover suggests about 0.9mH inductance (Le) to me at a wild guess.
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Old 8th July 2012, 02:42 AM   #27
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I think the woofer is an Audax that is no longer available. The center of the back plate looks similiar to the Audax drivers I used in the early 80's. They made a lot of drivers.
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Old 23rd September 2012, 11:14 AM   #28
bug2k11 is offline bug2k11  United Kingdom
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I've picked up a pair of these Seas Prestige H1217-08 CA18RLY
I've measured them with the Dayton Audio DATS and these are the paramters for each:

* Manufacturer: Seas
* Model: H1217-08 CA18RLY
* Piston Diameter = 125.0 mm
* f(s)= 44.41 Hz
* R(e)= 6.04 Ohms
* Z(max)= 28.37 Ohms
* Q(ms)= 2.647
* Q(es)= 0.717
* Q(ts)= 0.564
* V(as)= 24.860 liters (0.878 cubic feet)
* L(e)= 0.92 mH
* n(0)= 0.29 %
* SPL= 86.72 1W/1m
* M(ms)= 10.93 grams
* C(ms)= 1.18 mm/N
* BL= 5.07

* Manufacturer: Seas
* Model: H1217-08 CA18RLY
* Piston Diameter = 125.0 mm
* f(s)= 44.41 Hz
* R(e)= 5.99 Ohms
* Z(max)= 29.82 Ohms
* Q(ms)= 2.526
* Q(es)= 0.634
* Q(ts)= 0.507
* V(as)= 24.860 liters (0.878 cubic feet)
* L(e)= 0.90 mH
* n(0)= 0.33 %
* SPL= 87.25 1W/1m
* M(ms)= 10.93 grams
* C(ms)= 1.18 mm/N
* BL= 5.37

Original Castle mid/bass drivers:

* Manufacturer: Castle
* Model: Chester
* Piston Diameter = 125.0 mm
* f(s)= 71.33 Hz
* R(e)= 5.49 Ohms
* Z(max)= 59.38 Ohms
* Q(ms)= 6.439
* Q(es)= 0.656
* Q(ts)= 0.595
* V(as)= 10.250 liters (0.362 cubic feet)
* L(e)= 1.00 mH
* n(0)= 0.54 %
* SPL= 89.43 1W/1m
* M(ms)= 10.27 grams
* C(ms)= 0.48 mm/N
* BL= 6.21

* Manufacturer: Castle
* Model: Chester
* Piston Diameter = 125.0 mm
* f(s)= 66.62 Hz
* R(e)= 5.55 Ohms
* Z(max)= 63.98 Ohms
* Q(ms)= 5.847
* Q(es)= 0.555
* Q(ts)= 0.507
* V(as)= 11.420 liters (0.403 cubic feet)
* L(e)= 0.85 mH
* n(0)= 0.58 %
* SPL= 89.74 1W/1m
* M(ms)= 10.57 grams
* C(ms)= 0.54 mm/N
* BL= 6.65

Measured a little different to the published data, but as some have said may be due to the levels used to test. I'll get the cabinets modified to fit them, be interesting to see how they measure with the existing crossovers.
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Old 23rd September 2012, 01:56 PM   #29
sreten is offline sreten  United Kingdom
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Hi,

Note that the cone masses are similar, so the differences in Vas and Fs
are very mutual. Also the lower BL of the Seas driver probably indicates
more excursion, but with lower sensitivity.

The x/o looks fairly standard and may work well with treble L-pad adjusted.

My limited experience of putting higher Vas and lower Fs drivers into tuned
1/4 wave boxes is not good, a serious case of one note bass resulted.

But I guess you'll have to suck it and see.

rgds, sreten.
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Old 23rd September 2012, 05:44 PM   #30
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Quote:
Originally Posted by sreten View Post
Hi,



My limited experience of putting higher Vas and lower Fs drivers into tuned
1/4 wave boxes is not good, a serious case of one note bass resulted.

But I guess you'll have to suck it and see.

rgds, sreten.
Sreten what was your choice of stuffing material that resulted in one note bass?

Many claim good results with fiberglass. Many old articles in books and magazines of it being to reactive compared to wool and low density polyurethane foam.
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