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Post by dzghia on Jun 16, 2005 15:40:14 GMT -7
Just got my new Ghia this week and I'm matching it with my Z 1-12 cab loaded with a GB. Any one else have this combination? It sounds fantastic but I'm wondering if the GB is efficient for the Ghia. I odered a Eminence C-Rex which I might send back if the GB will work fine. Thanks for your opinion and suggestions!
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Post by myles on Jun 17, 2005 7:40:23 GMT -7
I think the Ghia works really nicely with a lot of speakers.
The Greenback is a standard and has specs of:
General specifications Nominal diameter 12", 305mm Power Rating 25W Nominal impedance 8§Ù and 16§Ù Sensitivity 97dB Chassis type Pressed steel Voice coil diameter 1.75", 44.5mm Voice coil material Round copper Magnet type Ceramic Magnet weight 35oz, 0.99kg Frequency range 75-5000Hz Resonance frequency, Fs 75Hz DC resistance, Re 6.9§Ù
Now ... the AlNiCo Blue has a smoother tone and specs of:
General specifications Nominal diameter 12", 305mm Power Rating 15W Nominal impedance 8§Ù and 16§Ù Sensitivity 100dB Chassis type Pressed steel Voice coil diameter 1.75", 44.5mm Voice coil material Round copper Magnet type Alnico Frequency range 75-5000Hz Resonance frequency, Fs 75Hz DC resistance, Re 6.4§Ù
See that "sensitivity" spec of 100dB vs 97dB? That extra 3dB may not seem like much but it will actually increase your output level by two times (it takes double the amplifier wattage to get 3dB of output). So, one way of looking at things is that you turn an 18 or so watt Ghia into a 36 watt Ghia. You can turn things down a bit and have more clean headroom if you wanted as the output will be louder at the same amp volume setting.
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Post by dzghia on Jun 18, 2005 17:37:53 GMT -7
Thanks for the info myles. I never knew that about the "sensitivity" so thank you for passing that along. Actually the GB sounds fantastic but with my humbucker tele it breaks up a little too soon. I've already received the C-Rex so I'm gonna see what it sounds like and see if it holds together a little better. Thanks again for the info!
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Post by dzghia on Jun 18, 2005 17:52:02 GMT -7
Hey Myles I was looking at the spec sheet for the C-Rex and it lists a 102dB for usable bandwidth. I'm assuming that is the same as sensitivity. Is this good or bad and will it give more volume?
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Post by chriztian on Jun 18, 2005 19:03:31 GMT -7
I used my old ghia for a year with a pair of greenbacks in an open cab and had very pleasant results. Since then, I've switched to a Z-Best and the only thing I miss are those glorious mids that greenbacks give. I'm considering mixing one of them back in the Z-Best. I want to keep that nice big bottom end. aw yeah babe.
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Post by rubess on Aug 5, 2005 20:22:56 GMT -7
Thank you Myles! I have a room full of speakers, and after many years of experimenting, had settled on the Celestion G12H30 as my all around favorite (esp when combined with a V30 in a 2x12 cab). But damn! Even at 18 watts, the Ghia was too loud for many of the small venues where my band plays. At Myles advice (above), I tried a Greenback in a 1x12 open back cab, and wow -- I had forgotten what a great speaker it is, and what a difference the lower (97 db) sensitivity makes! Suffice it to say, I have returned to Greenbacks. If you need to volume-down a Ghia, and maintain great tone, try a GB -- it's almost like using an attenuator, just 10 times better!
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Post by bustertheboy on Aug 29, 2005 1:07:46 GMT -7
I'm using a pair of greenbacks in an open back cab i've built with a sloped front. The sound is amazing esp with my tele- there's this midrange bark or crunch even when the amp is running clean- I don't really agree that a greenback pair is half as loud at 97db than vintage 30 at 100bd- certainly a bit louder but not as classic a tone. I've used a weber mini mass speaker attenuator for softer gigs and changed the treble bypass cap in it to 1uf- great
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Post by DirectionalShear on Aug 29, 2005 18:46:52 GMT -7
See that "sensitivity" spec of 100dB vs 97dB? That extra 3dB may not seem like much but it will actually increase your output level by two times (it takes double the amplifier wattage to get 3dB of output). So, one way of looking at things is that you turn an 18 or so watt Ghia into a 36 watt Ghia. You can turn things down a bit and have more clean headroom if you wanted as the output will be louder at the same amp volume setting. That is very interesting! Thanks for the into Myles. If at all possible, could you give the comparative figures for the stock Z-10 speakers as I am awaiting a 2 x10 combo? Or is it at all possible to compare your data for single 12s with two 10 inch cones pushing air?
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Post by Jim Fairbairn on Aug 30, 2005 4:59:45 GMT -7
The sensitivity for the Z 10's are 101db. Compared to 12" speakers, G12H30 is 100db, greenback 97 db, V30 100db. The Z 10's seem very efficient.
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Post by real oldster on Sept 3, 2005 4:13:18 GMT -7
"I'm using a pair of greenbacks in an open back cab i've built with a sloped front."Very interesting. Could you post a pic of this cab? Thx
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Post by bustertheboy on Sept 25, 2005 21:13:07 GMT -7
re posting a pic of my green back slope front cab for oldster- i would if i know how on this forum- otherwise maybe send me your email address and i'll do it that way
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