Hi All,
total newbie from England. Mid way through my first ever speaker build using mostly recycled bits I could find on eBay in Europe. Sounds like it has great potential but a tad bright. Does anyone have any tips how to tone it down a tad?
I’m unsure how to tune and if the decision of passive radiators Vs port was right. Specs right now are. Cheers all.
Box: Plywood tea box, originally for storing tea bags.
Drivers: SB Acoustics SB65WBAC25-4 Full-Range
Passive radiators: Unknown Sony
Amp: Tang Band Kit0059 10Wwith adjustable high pass filter
Lining: Neoprene
Filler: Monacor speaker pad / foam (added after taking pics)
total newbie from England. Mid way through my first ever speaker build using mostly recycled bits I could find on eBay in Europe. Sounds like it has great potential but a tad bright. Does anyone have any tips how to tone it down a tad?
I’m unsure how to tune and if the decision of passive radiators Vs port was right. Specs right now are. Cheers all.
Box: Plywood tea box, originally for storing tea bags.
Drivers: SB Acoustics SB65WBAC25-4 Full-Range
Passive radiators: Unknown Sony
Amp: Tang Band Kit0059 10Wwith adjustable high pass filter
Lining: Neoprene
Filler: Monacor speaker pad / foam (added after taking pics)
I use an .4mh air coil inductor and 3.3 ohm resistor BSC circuit with peerless ta6fd00-04, a pretty similar driver it looks like, they both have the copper cap on the pole piece. I think that will work well for you. They'll still be a bit bright but within tolerance, they won't be screeching at you.
Hmm, IME and based on these actual measurements; like many 'FR' drivers, one ideally needs to listen off axis [toe'd in], so might want to try as much as 20-30 deg before resorting to 'polluting' the response with power robbing added resistance: https://audioxpress.com/article/Tes...5WBAC25-4-2-5-full-range-driver#&gid=1&pid=13
It's worth confirming the tuning frequency of the PRs. At a low-to-moderate volume, run a low-frequency tone through the speakers. Make it loud enough that you can see the cones moving. Start at 40Hz and move upwards until the SB65 cones come to an almost complete stop. The PRs should be moving quite a lot at that point. That frequency is your tuning frequency.
Chris
Chris
+1 on BSC circuit. Try iron core, they work quite well, cost less, have lower DCR to maximize the little bass you have. Try various resistances (3.3R to 6.8R) and pick one that sounds good to you. This driver is already a low 82dB so dropping off 5dB on BSC will put you close to 77dB overall sensitivity at 2.83v.
Hello xrk971, I just wanted to say that these are 4 ohm and 3.3 is already 6db of attenuation...experimenting with various values is always good of course!
I have also gotten some large bipolar electrolytic caps to roll off bass similar to here http://www.troelsgravesen.dk/5F-8422T01.htm as I'm enjoying being able to crank them up with the subwoofer crossover enacted but with no sub connected (lousy sub, sounds like cr** to me), so I'll see how that goes. I'm not sure trying to get bass out of these little things is a good idea on balance, so some experimenting.
I have also gotten some large bipolar electrolytic caps to roll off bass similar to here http://www.troelsgravesen.dk/5F-8422T01.htm as I'm enjoying being able to crank them up with the subwoofer crossover enacted but with no sub connected (lousy sub, sounds like cr** to me), so I'll see how that goes. I'm not sure trying to get bass out of these little things is a good idea on balance, so some experimenting.