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Cerwin Vega AT-15 Low bass?

whoaru99 said:
That they are of same polarity is good to confirm, but then have you also triple checked the both amp channels (+) & (-) are correctly connected to both speakers (+) & (-)?

I recall a past thread, very long, where a respected member was having lack of bass and insisted polarity was correct, so all sorts of other theories were floated.

After pages and pages of back-and-forth posts, can you guess what the problem ended up being?
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Oh yea that’s unfortunate. I will check that thanks!
 
twiiii said:
There is deep bass, accurate bass, boomy bass, pounding bass, etc. Each demads the speakers system to perform amazingly well in a different part of the frequency spectrum 150 HZ down. Knee jerking bass like for disco music is centered around 43 HZ. Which CV's did very well. But if you are after pounding bass and very tight percussive bass from a big bass drum tuned to 30 HZ or lower the AT is going to fall flat on its face. Speakers back then used a +/- 10 db frquency envelope when describing their frequency respose. Not like some speakers to day that use +/- 3 or 6 db which makes quite a difference as you are finding out. So you better plan on buying some good subs woofers. And not with small 10 or 12 inch drivers either. Bass still isn't cheap or never has been cheap for great bass. You might move the speakers against a wall or closer to corners as that can help boost the bass by 6 to 10 db in the bottom octave, But once you get to 28 HZ, thats it. My HT speakers reach 23 HZ +/- 3 db and sound great. But for really deep bass I use my stereo speakers which are +/- 4 db to below 20 HZ with 10 to 15 db less distortion which cleans up the bass reproduction significantly. Giving the bass more snap when its required. Unfortunately your older woofers are more of the high distortion type as were most woofers from that period and like my HT speaker woofers are. If you decide to change speakers remember it takes 2 10" woofers to move as much air as a single 15 inch. Except for Volti, Klipsch and a few JBL most current speakers made to day are 10 db less efficient than your CV's meaning they need 10 times as much power as your CV speakers to reach the same level in sound output. Ka-ching KA-ching said the cash register.
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Haha yea lost of money can be spent down the rabbit hole. Thanks for the explanation!
 
Dswankey said:
I'm aware you since got a Fosi, my question was with regards to prior to that what were you using for a music source?
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Oh RCAs plugged into aux to my phone
whoaru99 said:
That would be good, yes.

I'm presuming the speaker fuses because of the way the 2.5A comment was made "I got the 2.5A ones in.".

For my D-9, I believe 2.5A slow blow was the normal fuse, 3A slow blow was the higher one listed, with the recommendation of using the bass turbocharger.
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Hi yup to Clarify I was blowing the 2.5 fuses in the speakers itself
 
Natasha Bell said:
Many years ago, I had a pair of its smaller cousins, the AT-12. It produced considerable bass. Just remember, if you are comparing these speakers to a car system... there is a many times smaller volume in your car, thus the sound pressure will be higher. For high levels of bass, although the AT-15 is very efficient, you require considerable power reserves. I would look at your amplifier first. It's not about "watts per channel", but how clear the amp can deliver the output. I suspect that you are clipping the speakers. What exactly are you driving the amp with? :idea:
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this here https://a.co/d/2thVmaf. To RCAs to my phone.
 
Natasha Bell said:
That it the problem. :oops: You need an actual preamp, not a phone.
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FWIW, using a phone as source rather than having a dedicated preamp isn't inherently going to cause any sort of failure.

I do it pretty regularly when I'm playing around, and nothing is damaged/has blown up.
 
whoaru99 said:
FWIW, using a phone as source rather than having a dedicated preamp isn't inherently going to cause any sort of failure.

I do it pretty regularly when I'm playing around, and nothing is damaged/has blown up.
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Power amps have very specific input requirements. While you may get away with a phone, doesn't mean it's not the issue. I would bet that if an actual preamp is used, the bass issue disappears (or is at least significantly improved) :)
 
VintageCerwi said:
I thought the Fosi was a pre amp??
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It would also need a specific range of input for it to function properly. The phone may not be supplying the necessary strength, or it could be oversaturating. I had that issue with my multimedia computer. The connection from the soundcard sounds best at around 80% volume.
 
Natasha Bell said:
I would bet that if an actual preamp is used, the bass issue disappears (or is at least significantly improved) :)
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I have dozens of various power amps from small tube amps and the small Class D amps to old school big iron that weigh 100lb each. While they do have some needs, like enough source voltage if you want to be able to hit rated output, as a general statement are high enough input impedance they don't require particular care/attention to the source output impedance.

That said, I wouldn't necessaily disagree about a preamp adding bass if the preamp has loudness contour that boosts the bass, or provides a bass knob to crank it up. And, apparently, is using a preamp, the Fosi.

But, again, the phone in itself is not the reason for blowing fuses and whatnot.
 
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And I don’t think it’s so much of a bass issues no more. I got these speakers down stairs in the basement after walking up stairs everything was shaking haha. But definitely a problem with the fuses unless I’m running them to hard.
 
VintageCerwi said:
A couple of times now been through 10 fuses now I think. (The reason why so much because I testing when they would blow) usually is when the bass cranked to full and I play it really loud
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I’ve never put it full just in case for hearing damage so I’m not sure if the bass was in the neural of the preamp and I cranked to it to full if it would blow
 
VintageCerwi said:
A couple of times now been through 10 fuses now I think. (The reason why so much because I testing when they would blow) usually is when the bass cranked to full and I play it really loud
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Yeah, well, blowing the fuses based on that description means you're pushing too hard... or just playing us.

Good luck, I feel you'll need it. I'm out.
 
whoaru99 said:
Yeah, well, blowing the fuses based on that description means you're pushing too hard... or just playing us.

Good luck, I feel you'll need it. I'm out.
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I wouldn’t waste your guys time! I got some blown fuses laying around. I can send a picture if you would like:) thanks for the help
 
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