ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi Everyone,
I am just brought a pair of Beovox 3700 (3702) I have plugged them in to me beomaster 2000 and my Beolab 1700 but bass woofer's output is very low in sound to the mid range and tweeter ? In fact all you can here is the tweeter and mid range but hardly any bass. I can see that the woofers have been re foamed at some point. I was just wondering if anyone no's is this low output is normal or could it be something to do with the crossover circuits? any suggestions or help would be greatly appreciated.
Many Thanks,
Lewis
Check the woofer, put 3 fingers around the dust cap, push lightly inwards, the cone should move lightly and without scratching noice, if the cone has no movement or moves heavily, a bed refoam job was done. If OK, check the crossover and cable connections.
Collecting Vintage B&O is not a hobby, its a lifestyle.
Hi, Thank you for the reply. I have pushed around the cone and it will not move at all its rock solid. I saw you said about a bad refoam in this case would you recommend removing the foam whats there and starting again? If it helps the only way to get bass out of the speakers is to put the bass on maximum on my amp then the pair sounds very nice.
It it feels like welded solid, it could be the magnets have come lose and locked the voicecoil.This can happen in rough shipping/transporting.In that case, a repair to the woofers is not easy and replacing the woofers may be the only way out.
Martin
Cut off the foam surrounds (if the magnets are loose you will have to change them anyway), and try to move the cones again, if moving freely, you ahve a bad done refoam job on your hands, If not the magnets may be loose. It possible to repair loose magnets, but its not for the fainthearted, search the forum for speaker magnet repair, Orava and Rich did some woofers with loose magnet.
DO NOT USE YOUR SPEAKERS UNTIL AFTER REPAIR, YOU WILL DESTROY THE VOICE COIL.
Hi Martin, Thank you for your advice that's exactly what happened you just couldn't move them. So i had a spare pair of Beovox s35's with a good bass drivers that have rubber surround and near enough matched the specs of what the drivers in the 3702's had, so I have swapped the drivers over and have hooked them up to my Beolab 1700 and they sound really nice.
I did want to ask if you or anyone else on here knows if they are ok to use with my Beolab 1700 as the speakers are rated at 40 watts ish now and the beolab is a 20 watt output I am worried I may fry it and I really don't want that to happen so thought I would ask.
Once again thanks to everyone that's helped out with advice.
Lewis :)
A low wattage amplifier is only dangerous to (even very large) speakers if the volume is turned high enough to cause distortion.Distortion causes a lot of high pitch harmonics, which by their high frequency nature will be directed to - andoverload (and often destroy) the tweeters.
My usual advice is;Don't pay too much attention to the wattage specs. Keep away from distortion and you'll be fine.If the sound is clean, nothing gets overloaded.