mlauritsen Posted December 25, 2019 Share Posted December 25, 2019 I was lucky enough (over a couple of years) to find two Peavey 3620s for practically nothing. (65kgs, 2x18 and 2x10) My question is: How powerful an Amp do I need, and how do I not blow anything up? The cabs have two "full range" inputs, which I figure I could use to chain the two cabs in parallel (Amp -> cab 1 -> cab 2). Since each cab is 400w (max) @ 4 Ohms, I would guess I need an amp providing at least 800w into 2 ohms? Not sure how the math works there... That's if I connect them in parallel. Another option would be to find an amp with two channels and plug one cab into each. Any suggestions for amps that would go with this? I would go with either Peavey power amps or crown, simply because I spent some time looking into their lineups and feel comfortable with them, but any recommendations are very welcome. I was planning to get a pre-amp pedal (Sansamp / Darkglass DI?) and run it straight into a power amp - would that work? Obviously, I'm responsible for my own mistakes, any advice here is very much appreciated! Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted December 25, 2019 Share Posted December 25, 2019 Hope you have roadies. As to amps these are rated 400W max which probably means the two 18's are rated at 200W each, that's incredibly low by modern standards and I suspect a sign that these were made in times when the coil formers and glues were less heat resistant than today. If these are the vintage items I suspect they are then treat them with respect and keep the power down. I'd maybe treat them as if they were 200W into 4ohms if longevity is important. They are likely to be pretty loud anyway. I'd be looking to keep the vintage look going and maybe match them up with one of the Peavey Mk111 or Mk1V amps which I think were 300W into 4 ohms. If you can find them they are usually dirt cheap and they are pretty reliable and very fixable if they do break. If not I'd be looking to get a stereo PA amp of about 2-300W into 4 ohms. Having said that reports seem to be that the 10's sound good but the 18's are a lot woolly. Running them bi-amped would probably give you the best sound because you'd be able to balance the two better.. If you've got two of the speakers then there are some 4 channel amps around, Thomann do one in their own 'The Box' range. 1 Quote Link to comment Share on other sites More sharing options...
mlauritsen Posted January 12, 2020 Author Share Posted January 12, 2020 Thanks, that's very helpful. I'll see what I can find power-ampwise. Can I just Y-cable the pre-amp output to the two power inputs then? I've seen Y cables for sale, but that does not mean it works well... Are there active splitters that work well for this? Quote Link to comment Share on other sites More sharing options...
Phil Starr Posted January 12, 2020 Share Posted January 12, 2020 You could probably just use a Y cable to split the signal or something like this https://www.gear4music.com/PA-DJ-and-Lighting/Behringer-ULTRA-DI-DI20-Active-DI-Box/297 You'll probably need to do a bit of experimenting to get the best out of these, though you may just like the sound out of the box. It looks like there is just a 500Hz crossover built in so the lows going to the 18's and the highs going to the 10's, you could just go direct into both pairs of speakers by passing the crossover but beware of overloading the 10's. Some power amps like my Peavey 1600's have a crossover to a sub, I'd certainly try sub to the 18's and tops to the 10's if that is available, which will effectively mean you've shifted the crossover point to around 100 Hz. If you can borrow a proper crossover you could experiment with other crossover frequencies. You could also try just mixing two entirely different tones to each speaker giving you something like the 'stereo' effect you can get with a Rickenbacker or the old bassists trick of feeding half their signal to a bass stack and half to a guitar amp. The options are quite varied and it is up to you how much you want to experiment My only worry would be that these are old speakers and of unknown health, start with the volume right down and listen for signs of strain and you shouldn't go far wrong. Good luck and have fun Quote Link to comment Share on other sites More sharing options...
mlauritsen Posted February 16, 2020 Author Share Posted February 16, 2020 I found a crown XLS 602 on a local auction site... However, it's rated at 600W into 4 ohms. (The 3620 says max 400W into 4 ohms...) Is there any way to safely connect this to a 3620? It would be easy enough to keep the volume down, but would the amp blow the speakers simply because the ratings don't match? My intuition tells me not to do this, but since I'm not an expert, I thought I would ask anyway. Quote Link to comment Share on other sites More sharing options...
mlauritsen Posted February 16, 2020 Author Share Posted February 16, 2020 Another option would be a peavey CS800, this seems to be a better match, powerwise... ? Quote Link to comment Share on other sites More sharing options...
Malcolm Williamson Posted January 30, 2023 Share Posted January 30, 2023 Late reply, I know. I played one of these bi-amped with a Gallien Krueger 800RB (300 + 100 watt) in the mid-90s. Loved it, still have it. Capable of serious damage - these are efficient speakers. Quote Link to comment Share on other sites More sharing options...
Malcolm Williamson Posted January 30, 2023 Share Posted January 30, 2023 Late reply, I know. I played one of these bi-amped with a Gallien Krueger 800RB (300 + 100 watt) in the mid-90s. Loved it, still have it. Capable of serious damage - these are efficient speakers. Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted January 30, 2023 Share Posted January 30, 2023 Quite the echo in the thread today! LOL Quote Link to comment Share on other sites More sharing options...
cd_david Posted July 24, 2023 Share Posted July 24, 2023 Do you still have the 3620s? If so would you be interested in selling one? thanks Quote Link to comment Share on other sites More sharing options...
BassmanPaul Posted July 26, 2023 Share Posted July 26, 2023 As the OP last visited on December 01 2021 I'm afraid your query fell on deaf ears. Sorry! 1 Quote Link to comment Share on other sites More sharing options...
Baloney Balderdash Posted July 27, 2023 Share Posted July 27, 2023 (edited) On 12/01/2020 at 15:01, mlauritsen said: Thanks, that's very helpful. I'll see what I can find power-ampwise. Can I just Y-cable the pre-amp output to the two power inputs then? I've seen Y cables for sale, but that does not mean it works well... Are there active splitters that work well for this? You might run into impedance issues using a Y cable to split your signal, which potentially can cause signal loss (basically tone suck), better to get a signal splitter/ABY box with an active buffer to avoid this happening. Edited July 27, 2023 by Baloney Balderdash Quote Link to comment Share on other sites More sharing options...
0175westwood29 Posted July 27, 2023 Share Posted July 27, 2023 this rig screams trying to grab a couple of the peavey mk4 heads that can run at 2 ohms one for each set of biamp, one could run the 18's and one the 10's Quote Link to comment Share on other sites More sharing options...
Japhet Posted July 27, 2023 Share Posted July 27, 2023 I keep reading about a new ocean forming in the horn of Africa. Does this setup have anything to do with that? Quote Link to comment Share on other sites More sharing options...
Bill Fitzmaurice Posted July 27, 2023 Share Posted July 27, 2023 On 26/07/2023 at 14:07, BassmanPaul said: As the OP last visited on December 01 2021 I'm afraid your query fell on deaf ears. Sorry! As did two more replies after you posted this. 😄 1 Quote Link to comment Share on other sites More sharing options...
0175westwood29 Posted July 27, 2023 Share Posted July 27, 2023 43 minutes ago, Bill Fitzmaurice said: As did two more replies after you posted this. 😄 but does serve a purpose if someone might search in about 6 months lol Quote Link to comment Share on other sites More sharing options...
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