The Whatever Thread .. For Gear!!

[dubkitty]

somebody check me on this, but it looks like what you've got there is two pairs of 8-ohm speakers wired in series and then combined in parallel. 2 x 8 ohms in series = 4 ohms; two 4 ohm pairs in parallel = 8 ohms. the second jack allows you to run a line to another cabinet. so, an 8-ohm cabinet.

[Gone Fission]

somebody check me on this, but it looks like what you've got there is two pairs of 8-ohm speakers wired in series and then combined in parallel. 2 x 8 ohms in series = 4 ohms; two 4 ohm pairs in parallel = 8 ohms. the second jack allows you to run a line to another cabinet. so, an 8-ohm cabinet.

Two 8 ohm speakers in parallel is 4 ohms. Two 4 ohm speakers in parallel is 2 ohms.

Two 8 ohm speakers in series is 16 ohms. Two 4 ohm speakers in series is 8 ohms.

[K2000]

Guys I think I goofed up. Looking at the second pic again, it looks like these are 16 ohm speakers. Does the wiring mean it's a 16 ohm cab?

Can anyone look at this speaker wiring pic and let me know how many Ohms this cab is rated for? Mongo not smart.

Sorry for link, can't seem to embed:
https://imgur.com/g3hCNII

8 ohm speakers:
https://imgur.com/a/KVC0k2R

[Gone Fission]

Can’t follow the wiring path in the pic and don’t know what’s up with the jacks. So mainly

Typical mono wiring in a 412 is to combine series and parallel wiring to get to the same impedance for all four as for a single speaker. Typical stereo wiring for 16 ohm speakers would be to run parallel pairs to get to 8 ohms per pair, then do something clever to put those pairs in series for a 16 ohm mono out. And I’m assuming left/right split. But I’m not seeing what looks like parallel wiring in top and bottom speaker on each side. Very odd. That suggests 32 ohm per set.

But you can roughly verify impedance with the resistance reading of a multimeter. I’d expect about 25.6 ohms to correspond to 32 ohm impedance, 12.8 to 16, 6.4 to 8, and 3.2 to 4.

What make/model is the cab? Is the second jack original or a mod?

[K2000]

What make/model is the cab? Is the second jack original or a mod?

It's a Peavey MS412 with Celestion speakers. As far as I know, it's all original... if I'm not mistaken, it's possible to use both input jacks and run the cab "stereo" (but I'm not sure about that).

[Blackened Soul]

What is the difference between a semi solid and semi hollow bodied guitar?

[K2000]

I have some old patch cables that have oxidation (?) on the shaft... I'm not sure what it is, the metal finish is dull. Don't worry about it? Clean them up (how?)

[Gone Fission]

They were with an unclean pedal I guess.

Deoxit?

[Pepe]

In this case I use fine steel wool and isopropyl alcohol afterwards. But I would like to hear if there is a better way to get rid of the corrosion/oxidation.

[coldbrightsunlight]

Anyone else done much with amplified violin family instruments? I've started playing viola through a few pedals in a band, and it sounds great and is fun but when recording recently I had seriously annoying feedback issues. I can deal with a bit of feedback, it's noisy music, but this was at the point where wasn't even possible to play unless standing in a very specific spot, rather than a fun amount I can fight against and work with and bring in when I want it.

I'm using a dirt cheap piezo pickup into a preamp, the EQ on the preamp helps dial out some feedback frequencies in the lows and super highs which aren't needed anyway, but when it's bad it gets to the point where I'm cutting out so much it's either quiet or sounds terrible.

I'm in another band with a guy who uses a viola with a similar in principle but more expensive piezo pickup and an LR baggs preamp. Sounds good and he doesn't get loads of feedback. But I'm just wondering what the fuzzy people on here might know about this, before I start dropping a bunch of money on stuff. Won't take much for the electronics to cost more than my viola

[oldangelmidnight]

Anyone else done much with amplified violin family instruments?

I don't have any experience but you sent me down a bit of a rabbit hole to see if I could find out what Warren Ellis uses with Dirty Three. I couldn't find any answers but I learned that this thing exists:
https://www.reusseffects.com/en-us/products/muzzbox

I'd guess best practices for any acoustic instrument would work. Can you put some foam or something inside to dampen resonance? A noise reduction pedal is probably the place to spend money.

[coldbrightsunlight]

Yeah I'm considering foam and stuff, haven't tried it yet. A pickup that's better clamped down I think would help too, mine moves around a bit and that can't be good. I would have thought a noise gate wouldn't really work very well as the feedback can be as loud as or overpower the actual signal so if it's set to where it opens when playing, it would probably let the noise through. IDK though, just need to experiment I guess.

[dubkitty]

the more solid the mount is, the less it should contribute to unwanted vibration/resonance. however, i have to think the dirt-cheapness of your pickup (and possibly the preamp) is an issue. i don't know a lot about deadening because the violinist i played with for years was a purist about packing shit in his instrument. he started out with a contact mic which worked well but had the kind of reedy, imprecise sound you might expect and later went to some kind of transducer-based preamp, but feedback wasn't really a problem. if i was going to try something i think i'd tape or block the f-holes first; a popular mod for jazzers with full-depth archtops is shaped foam or plastic pieces that fill the f-holes to stabilize the top. that would be a lot simpler than stuffing foam blocks in. note that completely closed hollow-body guitars exist and have been historically popular, e.g. the Gretsch Chet Atkins Country Gentleman series.

[dubkitty]

this might also require some research with everything set up to see if there are particular places in the stage array that are more/less problematic. consider whether proximity to another person's amp, drums, monitor, or other item could be your bad trigger. i'm thinking the bass amp/cab may not be your friend. we used to have to work to place Dan on stage sometimes. from the other end of the snake, Ted Nugent used to go around before shows marking the spots he needed to stand to get the feedback notes in "Journey To The Center Of You Mind" with gaffer's tape. perhaps you need to do the negative inverse of that.

[Blackened Soul]

Anyone else done much with amplified violin family instruments? I've started playing viola through a few pedals in a band, and it sounds great and is fun but when recording recently I had seriously annoying feedback issues. I can deal with a bit of feedback, it's noisy music, but this was at the point where wasn't even possible to play unless standing in a very specific spot, rather than a fun amount I can fight against and work with and bring in when I want it.

I'm using a dirt cheap piezo pickup into a preamp, the EQ on the preamp helps dial out some feedback frequencies in the lows and super highs which aren't needed anyway, but when it's bad it gets to the point where I'm cutting out so much it's either quiet or sounds terrible.

I'm in another band with a guy who uses a viola with a similar in principle but more expensive piezo pickup and an LR baggs preamp. Sounds good and he doesn't get loads of feedback. But I'm just wondering what the fuzzy people on here might know about this, before I start dropping a bunch of money on stuff. Won't take much for the electronics to cost more than my viola

Live… I use solid bodied instruments (NS Design) and I still get feedback when I use all the gain for acoustic instruments I like K&K on both cello and double bass. I hate to say it but the best solutions I have seen is gaffer-taping over the eff-holes and stuffing foam/cloth inside the instrument. Also strings are important.. dark sounding strings help getting a better distorted sound and less feedback (currently using jargar), a paramedic eq is also useful as you can find the freq that causes the worst and turn it down a bit..