KEF C80 - 4 ohm? (or - how can I hit 100 db?) - AVS Forum
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post #1 of 9 Old 09-19-2013, 03:32 PM - Thread Starter
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Hello,

I'm interested in a pair of KEF C80 speakers in my local used market. They look to be in "very good" condition. The asking price is $200. The specs are:

Specification: C80
System Type: Three-way, floor standing
Enclosure type: Closed box
Size: 850 x 265 x 315mm (33.5 x 10.4 x 12.4 inches)
Weight: 19.8kg (43.5 lb)
Nominal Impedance: 4ohms resistive
Rated maximum power: 300W programme (into 4 ohms)
Frequency response: 50Hz to 20kHz +/-3dB (-6dB at 38Hz)
Sensitivity: 87/89*dB for a pink noise input of 2.83V (*dependent on contour control)
Maximum output: 112dB on programme peaks under typical listening conditions
Finish: Walnut, Rosewood or Black Ash real wood veneers
System: SP3055
Drive units: B139 bass unit (SP1212), B160 midrange unit (SP1203), T33 tweeter (SP1210)
Crossover: SP2055


I'm running a Marantz NR1602, with an external Crown 1500 XLS (300 wpc) amp for the main speakers.
I have the Klipsch RW-12D as a sub.

My current main speakers are the Wharfedale Diamond 10.2 bookshelf speakers:
Format: Bookshelf
Bass/Mid Driver: 6.5"
Tweeter: 1"
Suitable Amplifier Power: 20 - 100 watts
Nominal Impedance: 6Ω
A/V Shielded: Yes
Sensitivity: 86 dB
Nominal Frequency Range: 40Hz - 24kHz
HF Limit (-10dB): 44kHz
Freq. Fb: 42Hz
Crossover Frequency: 1.8kHz
Dimensions (HWD): 14.33" H x 8.78" W x 11.85" D
Weight: 15 lbs. (Each)


I'm concerned about the efficiency and the impedance of the KEF speakers.

I wondering if the KEF speakers will give me more volume than the Wharfedales.

Any thoughts or opinions?
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post #2 of 9 Old 09-19-2013, 03:46 PM
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The KEF's appear to have a slighter higher sensitivity so they should play a little louder at the same volume.

Since you are using a Crown amp I wouldn't worry about using 4 ohm speakers, they'll be fine.

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post #3 of 9 Old 09-20-2013, 03:36 AM - Thread Starter
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So, sensitivity is the end-all-be-all for loudness, when looking at speaker specs?

The maximum power rating, 3-way design, and physical size does not matter?

I'm looking for a significant boost in volume, so I should be looking for higher efficiency ratings - like 93+?
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post #4 of 9 Old 09-20-2013, 03:11 PM
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Anything above 90dB or so should work. Just be aware that many manufacturers specs tend to be just a bit on the optimistic side to put it generously. If you can, find some third party specs that are able to truly tell you about the speaker's capability.

Dumb enough to spend lots of cash on this junk!
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post #5 of 9 Old 09-21-2013, 03:30 PM
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Quote:
So, sensitivity is the end-all-be-all for loudness, when looking at speaker specs?

No, and nobody ever said that.

Quote:
I'm looking for a significant boost in volume, so I should be looking for higher efficiency ratings - like 93+?
If you've got a 300W amp, why are you so worried? That should be enough power to play at very loud levels for almost any size room.

How big is the room you're using?

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post #6 of 9 Old 09-22-2013, 05:49 AM - Thread Starter
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Well, I seem to be unable to hit 100 dB at a listening distance of 9 feet away - in a 13' X 40' (open concept) living room/kitchen combo space.

But I may need a better SPL meter for a more accurate reading. I'm using a cell phone app at the moment.

I feel like this system just isn't loud enough (during parties), so I'm doing measurements and trying to pay attention to possible source-differences (ie streaming pandora vs CD).

I'd be willing to try other speakers, if I could do it for a reasonable price (I'll flip the speakers I don't keep).

I don't want to blow the Wharfedales - not sure they are really made for this kind of volume levels.

I've heard Cerwin Vega and Klipsch are good for "loud volumes", and I'm seeing high efficiency ratings on those speakers (typically). I have a preconceived notion that the Cerwin Vega's aren't that great of a quality, though they do have many fans. I guess, I'm just "playing around" with this system and trying to see what I need to hit 100->110 dB levels.
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post #7 of 9 Old 09-22-2013, 01:00 PM
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Pro style speakers will get you the volume without breaking the bank. How are you at woodworking? Can you out a puzzle together?

The SEOS speakers have a pretty big following, are a snap to put together, sound great, and can get crazy loud.

Dumb enough to spend lots of cash on this junk!
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post #8 of 9 Old 09-22-2013, 01:49 PM - Thread Starter
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I have more confidence with woodworking than skill, but I'm not beyond trying. I'll check into the SEOS design. Thanks.
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post #9 of 9 Old 09-22-2013, 02:23 PM
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Check the DIY section. There are a bunch of SEOS builds on there if you want to see what it's all about.

Dumb enough to spend lots of cash on this junk!
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