Street Fighter 2 speaker question

Bonecollektor

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I guess this could be more of a general question about replacement speakers but, anyway I've read conflicting posts about the proper ohm speaker for arcade cabinets. Is it 4ohm or 8ohm? Also, I've noticed that my Street Fighter 2 Champion Edition manual says that the sound is in two-speaker stereo yet the wiring diagram only shows one set of (+)(-) connections for speakers. Can somebody help me out on this one please? lol
 
well I just decided to grab a bookshelf speaker I had laying around the house and give it a try. It was just a plain Sony pre-fab bookshelf that measured about 6.2ohms. Seemed to work just fine but, I did come across something strange. If I let the cabinet sit in "attract" mode I didn't have any issues with the sound. However, during gameplay I noticed the sound would cut out and in once instance actually froze up to a single tone. I'm not sure if I have a loose connections somewhere on the boards, cold solder joint, or a bad rom. I'm going to do a rom check and investigating tonight and see what I come up with.
 
well I just decided to grab a bookshelf speaker I had laying around the house and give it a try. It was just a plain Sony pre-fab bookshelf that measured about 6.2ohms. Seemed to work just fine but, I did come across something strange. If I let the cabinet sit in "attract" mode I didn't have any issues with the sound. However, during gameplay I noticed the sound would cut out and in once instance actually froze up to a single tone. I'm not sure if I have a loose connections somewhere on the boards, cold solder joint, or a bad rom. I'm going to do a rom check and investigating tonight and see what I come up with.

if there are two I usually use 16 ohm to give you 8 ohms when there are two. If it is 4 ohms use two 8's. It is just half if you use two in parellel.
 
Jamma pinout is only mon sound, although if you are doing street fighter, id go stereo just in case you change it up at some point and use cps2 with an amp and rca output.
 
thanks for the reply guys! Tapping into the those pins to get the L & R channels is pretty slick!! It has me looking into building my own cheap amplifiers! :)
 
thanks for the reply guys! Tapping into the those pins to get the L & R channels is pretty slick!! It has me looking into building my own cheap amplifiers! :)

What type of amplifier would I be able to purchase to get this to work? I have not looked at the speaker connections in any of my cabinets, are they same as let's say hooking up a car stereo? Would you need to run both negatives to the #3 ground pin and the positive from each speaker to the #1 and #2 pins...or do the arcade speakers only use one wire?
 
Car stereo amps would have way too much draw on the amps for a cab use. Perhaps picking up a q sound amp (one on ebay now) a namco amp or something that could be easily modified. Or use the bob roberts computer speaker method.
 
I'd love to hear more opinions on putting 6 ohm speakers in place of 8 ohm speakers. My Hang-On originally had 8 ohms that worked but didn't have any bass. I replaced them with a set of 6 ohm woofers that I salvaged from a pair of old Aiwa bookshelf speakers and now it sounds great. I have been wondering if there would be any long term effects on the boardset doing this though. Research is telling me going from 8 to 6 is usually fine and that its the jump down to 4 ohms that should be avoided.
 
Car stereo amps would have way too much draw on the amps for a cab use. Perhaps picking up a q sound amp (one on ebay now) a namco amp or something that could be easily modified. Or use the bob roberts computer speaker method.

Is there a link to the Bob Roberts computer speaker method?

Thanks!
 
8 ohm is where it's at, I don't know why you'd use anything else in home/non-auto application. Two 4ohm speakers would have to be wired in series to create a proper 8ohm load.

Street fighter 2 (1990) was mono, i guess we're talking about a newer street fighter that uses the A/B boards and has "Q sound?" If so, yes all you need is an amp and Parts Express sells a nice 25w Leipai amp for $25 that does a nice job.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=310-300


If the game is mono but your cabinet has two speaker mounts, I've gone the crazy route and done Woofer / Tweeter hookups and put a high-pass filter in the line to split off the frequencies. The clarity you get is worth the effort, if you love the game enough.
 
8 ohm is where it's at, I don't know why you'd use anything else in home/non-auto application. Two 4ohm speakers would have to be wired in series to create a proper 8ohm load.

Street fighter 2 (1990) was mono, i guess we're talking about a newer street fighter that uses the A/B boards and has "Q sound?" If so, yes all you need is an amp and Parts Express sells a nice 25w Leipai amp for $25 that does a nice job.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=310-300


If the game is mono but your cabinet has two speaker mounts, I've gone the crazy route and done Woofer / Tweeter hookups and put a high-pass filter in the line to split off the frequencies. The clarity you get is worth the effort, if you love the game enough.

I agree that I would rather use 8ohm speakers but, to my surprise there are several home theater/home bookshelf speakers that are actually 6ohm. I even went and measured my Paradigm speakers and they measure 6ohms LOL. I always thought they were 8ohms. Meh...oh well. Anyway, I really appreciate the link to parts express!! That little amplifier would work perfect and is cheap as hell!!! I would still have to buy a line level adapter (if I don't already have one laying around the house somewhere) to convert the high level input to RCA. Not a bid deal though.

Several sources state that the SF2 Champion Edition is stereo 2-channel but, of course only one set of speaker wires are coming out of the JAMMA harness. Heck, even KLOV lists this game as having stereo sound:
http://www.arcade-museum.com/game_detail.php?game_id=9815
I think that why I was a little confused. If there's stereo sound available of course I would want to use it! :) I think tapping the pins for the stereo input to a line level converter and then out to the amplifier you posted the link to would be an awesome setup!! I could mount the amplifier Near the coin door for ease of access and quick volume control!

Thanks again!!!!!
 
no way, how the... must check this out next time i have a board.
i wonder how it sounds.
 
Ok, so I just happened to find a nice 3-pin connector that fit perfectly on CN5! I couldn't find my high-level adapter so for now I just connected the wires into a set of cut RCA cables. PIN 1 to the left(+), PIN2 to the right(+), and PIN3 to both of the RCA (-). I adjusted the volume pot on the board down quite a bit to make sure I wasn't going to send to much signal voltage to my stereo. Next, I ran the RCA connections to my stereo to see what it sounded like. On the plus side, I HAVE STEREO SOUND!! :) I can hear distinct separation between the characters through the left & right channels BUT, the sound is horribly unbalanced. The right channel is significantly louder than the left. However, I should be able to resolve this issue when I find/install the high-level adapter. I should be able to adjust the pots on the high level adapter to increase or trim as needed. I'll keep posting my progress....well...that is if I could ever find that damn high level adapter! LOL!
 
Ran into a couple of things that are a little unusual. The first one being, the sound sometimes cuts out occasionally. Doesn't matter what the game is doing it just seems to cut out but, if I reset power to the game it comes back on. Other times it doesn't happen at all. I've been reading a few posts around the forum and have noticed this could be a few different things: the z80 processor, the caps on the boards, or the eproms are a screwed up. Does this sound right? Well, I went ahead and ordered some new caps and was considering picking up a z80 if that doesn't fix the problem. If for some reason that doesn't do the trick I guess it's time to pick up an eeprom writer/eraser and try that. Which I need to do anyway considering the fact the game has a modified version of the game already. LOL Dhalsim is extremely fast and the difficulty doesn't seem to change with the dip switches are just a couple of things I've noticed so far.

Any other ideas on the sound?
 
Any updates?

Are you sure you need a "high-level adapter"? I thought CN5 was line-level. Even if not, the fact that it's amplified shouldn't produce the weird stuff going on. Are you sure you wired it correctly? This image suggests the ground only go to one RCA [source]. And more evidence of the simplicity.

I plan to do this mod as well and I want to be sure I have what I need.
 

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Well, the sound has completely quit. I've been trying to figure out why and so far I'm been getting my butt kicked. I've installed a new 40-pin socket and z80 processor, a new HA...whatever the part number is for the amplifier, all the caps in the sound section of CPS1 board A have been replaced. I've even used a logic probe and tried to follow some of the CPS1 repair logs but still no luck.

Before the sound quit, I could power the game on and play for a few minutes and then it would cut out. If I kept the machine on sometimes I would get a loud squeal out of the speakers and then followed by static.

Has anyone done any repair on these boards??? This stinks.
 
I wonder if the "safe way" to do this is to run the sound to a Namco, NAOMI, or Q-sound preamp, then to speakers.
 
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