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Pioneer CS-77 Speaker Mod Suggestions
Pioneer CS-77 Speaker Mod Suggestions
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Old 6th January 2016, 03:37 AM   #1
montana1 is offline montana1  United States
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Default Pioneer CS-77 Speaker Mod Suggestions

I'm new to this forum and after observing for some time how eager the group is to lend their knowledge. I decided to seek feedback on ways to get the most performance out of my newly acquired Pioneer CS-77 loudspeakers. I realize they are not extremely well thought of but for someone like myself who is new to hifi I thought they would make a good starting point.

My goals are:
1) Stay within a $300 budget for the pair.
2) Achieve very good sound quality (not necessarily audiophile performance)
3) Change the usual suspects like capacitors/ coils if suggested.
4) Change drivers if that is the preferred direction of the group. note: all drivers are in good working order.
5)* Drastically improve bass which is really lacking above all other ills.
6) Listen and learn from the responses I receive
7) Have fun with the project.

Thanks in advance! Look forward to hearing the ideas that are to come.
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Old 6th January 2016, 04:50 AM   #2
planet10 is offline planet10  Canada
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Pioneer CS-77 Speaker Mod Suggestions
Like these?

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

If you are going to change drivers you should just start from scratch.

The XO parts don't look that bad, but it is a very simplistic design. You could consider a redesign.

Looks like a nice alnico woofer.

I'd consider making a new baffle so that the drivers could be mounted in a vertical array.

Stiffen the cabinet. Stiffen the mid enclosure.

Trim off the raised edges that hold the grill (and lose the grill).

Rewire.

Ductseal the baskets.

Treat the cones (that is one of the things i do for a living so i'd take it to extremes)

If bass is MIA, you need to figure out if the bass driver has drifted or the box needs redesign. You'll have to measure the T/S parameters. Hopefully you can retune for decent bass.

dave
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Old 6th January 2016, 05:09 AM   #3
montana1 is offline montana1  United States
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Yep, those are the ones I have except those appear to have upgraded caps. Those are all excellent suggestions. If a person liked the grill could it be left in place and still achieve quality sound once finished? Also, what product do you use to treat the cones?

Thanks Planet10 for your speedy response!
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Old 6th January 2016, 05:16 AM   #4
picowallspeaker is offline picowallspeaker  Italy
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Yes, pointing on the edges ! What about redesigning it ?
Maybe just a -experimental- baffle

so it becomes an OB speaker system ( and tests should be made accordingly )

-The woofer is mounted as moderns do: onto the baffle from the front
-The midrange is freed from the plastic cilynder
-The tweeter is changed to a modern one

The first buyings are the tweeters and the coils ( about 4-5 mH or more )
Then capacitors ( as it has been shown in those pics)...also 50 and 100 uF ( for the new 2nd order lowpass ) pairs
A resistor ( or net ) substitutes the L-pad or maybe it isn't needed

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Old 6th January 2016, 05:21 AM   #5
picowallspeaker is offline picowallspeaker  Italy
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Of course, take some practice with circuit diagram, schematic, component values

Phisical attachment between conductors

Pay attention when mounting the speakers with the screwdriver near the membrane or suspension
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Old 6th January 2016, 05:31 AM   #6
montana1 is offline montana1  United States
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So far, it appears the biggest downside to this cab is the baffle. The good news is I'm not in a huge hurry to complete the project. I will gather information and plan out the project over the next several months. So the more replies the better. Then next winter commence the project. As a golf course superintendent in the mountain west, my job is very seasonal. Cabin fever sets in so it is nice to dive into another hobby through the winter.

Thanks again for the replies thus far!
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Old 6th January 2016, 06:01 AM   #7
picowallspeaker is offline picowallspeaker  Italy
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Good news from tech development from the 70's

You can reuse those cabinets to house just a new 12" sub

and put the old speakers on a baffle above ( maybe with the same style, but the grill/tissue must be still avoided)
Tweeter changed ( also the 1st order filter on the midrange should/could be perfected to 2nd order ) or if you're satisfied by the sound of it ... I doubt becasue 16 kHz was the rule for cut off
You may invert mid and tweeter position, either, or put the woofer on the top

Last edited by picowallspeaker; 6th January 2016 at 06:09 AM.
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Old 6th January 2016, 06:07 AM   #8
planet10 is offline planet10  Canada
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Pioneer CS-77 Speaker Mod Suggestions
Quote:
If a person liked the grill could it be left in place and still achieve quality sound once finished?
Not in theory. You will have diffraction effects from the grill. Try it with and without and see if it makes a difference to YOU.

dave
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Old 6th January 2016, 06:12 AM   #9
picowallspeaker is offline picowallspeaker  Italy
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And how you would call the effect of the tissue ? Diffusion ?!



Maybe I've found the correlation between the semi-quasi-gaussian diffusion
(nearly quantic)
and gradient


Last edited by picowallspeaker; 6th January 2016 at 06:16 AM.
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Old 6th January 2016, 06:58 AM   #10
montana1 is offline montana1  United States
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My what great ideas have already been presented. I'm not a cabinet maker but it would seem somewhat easy to design a baffle that would mount flush with front edge of box. Of course then the grills would go bye bye. The baffle could be done in walnut veneer to match the rest of the cab much like Pioneer CS-77a models. From a driver selection standpoint, should i design the baffle to house a smaler woofer than the original 12"? Something like to 10" or maybe 8". I have started running simulations with various drivers on Winisd. Again much to learn. Very exciting stuff.

Thanks so much Guys!!! Your wealth of knowledge is appreciated.
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