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This review is for the JM Labs 927 Electra Be floor standing speaker. It is a limited edition of 500 pairs. The retail price is $6000. I paid $5300. It is based of the 926 floor standing speaker. The 926 retail price is $4125. The 926 uses 2 seven inch drivers to deliver the bass. The 927 uses...

This may be a stupid question but if the following are the corections for the radio shack SPL meter 10hz........+20db 12.5hz.....+16.5db 16hz........+11.5db 20hz........+7.5db 25hz........+5db 31.5hz.....+3db 40hz........+2.5db 50hz........+1.5db 63hz........+1.5db 80hz........+1.5db...

Part I-about sub woofer This subwoofer is JM Lab’s Electra SW900. The retail price is $1750. It is a bass reflex design. It is set in a downward firing configuration. The driver itself is 13.18 inches. A 400-class A/B amplifier powers this subwoofer. I know that their web site says 250 watts...

Can some one tell me what this means? This driver is used in 100litre cabinet using two large profiled reflex ports; naturally, this system descends to 32Hz at –3dB in free space! With a little help from the amplifier’s optimized response, this limit is pushed even lower. Thanks

If I have all of the Thiel specs for my driver, how do I try to figure out what the Vd (displacement) might be. Is there a site that does this for you? Thanks