SDA-Helpful Hint for Bad Mid Driver Noise
Dennis Gardner
Posts: 4,861
That bad driver in a multi-mid/woofer setup may not be bad afterall....................
The past week I have been suffering with what I considered to be a bad driver on my SDA1Cs. It smacked, clacked and generally made a hell of a racket when a drum kick or deep bass note sounded at high volume. I couldn't recall any time that I had really driven them too hard or to the point of mistreatment, but it was definately not working in unison with the other mids in the box. Late last night I took the driver out to see for sure what model I needed to look for, I noticed one of the speaker leads had come loose. Hooking it back up, problem solved.
SDA mid drivers in a sealed box/passive radiator design without a signal runnng through them to control excursion become the passive radiator. Being only 6.5 inches, they easily move too far and reach the limit of their travel in a most noisy and uncomfortable sounding smack.
Just thought I would pass on what may be obvious to some here on the forum, but we have had a number of members listening to speakers that are for sale find SDAs that had a mid driver that made racket at high volumes and assumed that replacement was neeed. I found out the easy way, this isn't always the case.
Thanks for reading,
Dennis G.
The past week I have been suffering with what I considered to be a bad driver on my SDA1Cs. It smacked, clacked and generally made a hell of a racket when a drum kick or deep bass note sounded at high volume. I couldn't recall any time that I had really driven them too hard or to the point of mistreatment, but it was definately not working in unison with the other mids in the box. Late last night I took the driver out to see for sure what model I needed to look for, I noticed one of the speaker leads had come loose. Hooking it back up, problem solved.
SDA mid drivers in a sealed box/passive radiator design without a signal runnng through them to control excursion become the passive radiator. Being only 6.5 inches, they easily move too far and reach the limit of their travel in a most noisy and uncomfortable sounding smack.
Just thought I would pass on what may be obvious to some here on the forum, but we have had a number of members listening to speakers that are for sale find SDAs that had a mid driver that made racket at high volumes and assumed that replacement was neeed. I found out the easy way, this isn't always the case.
Thanks for reading,
Dennis G.
HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable
2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable
Post edited by Dennis Gardner on
Comments
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Thanks for the info, Dennis!
I have another helpful hint for those contemplating SDA Xover improvements: replace the damn polyswitch! I'm kicking myself for not replacing, or bypassing, them when I upgraded the SRS and 2B components. I'd never had an issue until I drove the SRSs pretty hard listening to Danielia Cotton (DAMN, this chick can sing!) They tripped once and now trip easily at fairly normal levels.
Mike -
Oh, my polys are kicking out, at the highest of volumes but I didn't want to do anything until I upgraded the rest of the caps in my crossover. Winter, indoor, snow flying type of job.......HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable
2 Channel Thorens TD 318 Grado ZF1, SACD/CD Marantz 8260, Soundstream/Krell DAC1, Audio Mirror PP1, Odyssey Stratos, ADS L-1290, ICs-DIY Twisted , Speaker-Raymond Cable -
Excellent tips guys, thanks for sharing. My xo upgrades are also planned for a wintertime activity.
