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ADS L710 Series II enough power?

Ishmael

Ishmael

Super Member
We are awaiting the arrival of a pair of ADS L710 Series II speakers, which we hope can be driven by our Denon PMA-7.5L integrated amplifier. This integrated can actually double its power from 45 watts at 8 ohm to 90 watts at 4 ohm and has a matching Denon DSD-7.5L CD player. I have read several posts concerning how much power/what type of amplifier-receiver should be used to drive the L710. It was interesting to read that some were having great performance with lower powered amplification whereas others wanted/needed substantial power to drive this speaker.

Online I found sales brochures for the ADS L710 and the ADS L710 Series II wherein the specifications for each speaker are listed with interesting differences, which may in turn explain the different experiences reported in the posts mentioned above:

ADS L710

Frequency response 25-25,000 Hz (DIN)
Impedance 4 Ohms minimum
Efficiency 87 dB SPL at 2 Watt input at 10 ft. distance
Recommended amplifier power 15 Watt minimum

ADS L710 Series II

Frequency response 40-23,000 HZ (+/- 3dB)
25-30,000HZ (+/- 5dB)
Impedance 6 Ohms nominal 4 Ohms minimum
Nominal power rating 75 W
Musical Peak power rating 150 W
Efficiency 92 dB SPL (at 1 Watt RMS input at 1 meter)

In the posted photos of our speakers on the binding posts they make no mention to ADS L710 II or Series II. However, on close inspection they clearly state “75 WATTS NOMINAL 150 WATTS MAXIMUM 6 OHMS NOMINAL 4OHMS MINIMUM”. They are therefore ADS L710 Series II which raises the bar on the power needed with only 15 Watts reserve from the PMA-7.5Ls 90 Watts at 4 Ohm to drive the 75 Watts nominal needed by these speakers, though at 6 Ohms nominal/4 Ohms minimum. Is this an insufficient margin to safely drive these speakers? Given that they will be played in our main listening room adjacent to our main system with forays from time to time into robust classical music and classical rock and roll, but not usually past 9:00-11:00 on the volume control, even though we know this does not tell you much about the actual power being used.

Thanks for your thoughts-suggestions.
 
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The "Nominal power rating" is not the minimum power needed to drive the speakers. You should be able to drive the speakers with a few watts, and to a satisfying volume level with your Denon, depending on the room size.
 
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Back in the day my 80 watt Kenwood Audio Purist ran hot as blazes with the 710's while the 75 watt Marantz 1150 hardly got warm.

The Marantz would even drive the 4 ohm 710's from the main terminals and 8 ohm speakers from the remote terminals without so much as a whimper.
 
I drove my L710a pair with a HK 430, no issues in my medium sized room.
I highly recommend subwoofering, check out the threads on distributed bass.
 
First, thanks for your experiences with this speaker, it sounds like we should be safe. Our room is an average sized living room with a cathedral ceiling which our Tannoy Turnberrys fill with music driven by 65 watts with volume at the 9:00-10:00 o'clock setting, at 11:00 o'clock we are talking as loud as we ever go and that for only brief small rock concert moments.

Second, a couple further question, does anyone know what ADS meant by "nominal power" and impedance of "6 ohm nominal 4 ohm minimum"? Does the latter mean that for most of the frequency range the speaker operates at 6 ohm or higher impedance with only occasional dips to 4 ohm impedance?

Finally, Davidb1 I will search for prior threads on subwoofering this speaker.
 
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Wow, right out of the box these are impressive speakers. I don't feel that we will need a sub-woofer, the conga drum hits at the start of "Hotel California" are felt through my feet! We also won't need more power than the Denon PMA-7.5L integrated amplifier provides. Going to go back to listening. I will clean up their cases tomorrow and post pictures once this maintenance is done with questions for ADS L710 series II owners. :music:
 
Ishmael said:
We are awaiting the arrival of a pair of ADS L710 Series II speakers, which we hope can be driven by our Denon PMA-7.5L integrated amplifier. This integrated can actually double its power from 45 watts at 8 ohm to 90 watts at 4 ohm and has a matching Denon DSD-7.5L CD player. I have read several posts concerning how much power/what type of amplifier-receiver should be used to drive the L710. It was interesting to read that some were having great performance with lower powered amplification whereas others wanted/needed substantial power to drive this speaker.

Online I found sales brochures for the ADS L710 and the ADS L710 Series II wherein the specifications for each speaker are listed with interesting differences, which may in turn explain the different experiences reported in the posts mentioned above:

ADS L710

Frequency response 25-25,000 Hz (DIN)
Impedance 4 Ohms minimum
Efficiency 87 dB SPL at 2 Watt input at 10 ft. distance
Recommended amplifier power 15 Watt minimum

ADS L710 Series II

Frequency response 40-23,000 HZ (+/- 3dB)
25-30,000HZ (+/- 5dB)
Impedance 6 Ohms nominal 4 Ohms minimum
Nominal power rating 75 W
Musical Peak power rating 150 W
Efficiency 92 dB SPL (at 1 Watt RMS input at 1 meter)

In the posted photos of our speakers on the binding posts they make no mention to ADS L710 II or Series II. However, on close inspection they clearly state “75 WATTS NOMINAL 150 WATTS MAXIMUM 6 OHMS NOMINAL 4OHMS MINIMUM”. They are therefore ADS L710 Series II which raises the bar on the power needed with only 15 Watts reserve from the PMA-7.5Ls 90 Watts at 4 Ohm to drive the 75 Watts nominal needed by these speakers, though at 6 Ohms nominal/4 Ohms minimum. Is this an insufficient margin to safely drive these speakers? Given that they will be played in our main listening room adjacent to our main system with forays from time to time into robust classical music and classical rock and roll, but not usually past 9:00-11:00 on the volume control, even though we know this does not tell you much about the actual power being used.

Thanks for your thoughts-suggestions.
Click to expand...
 
wo , hold, on you talking about a different room? those turnberrys which I never heard should totally dominate the l710s no matter which ones. I have 12 x20 room with 12 " gold Dalton tannoy one end,, dynaco mk III modded, ads st 70, modded with 710 same way other end. Lower volume play same time, but sounds mixed cranked to 11:00. when I need more volume I use one or other. Tannoys take room by force with deep driven sound not unlike another tube room dynaco st35 with cornwalls, but a little better. 710s killer mids tight bass hits piano and most vocals awesome, fun to have choice either or both. In conclusion preamp also tube, encore 2010.2 can allow me all choices along with adjustable phono . To address question I feel volume level when listening is critical, I do not know if my answer qualifies, but I felt my input even late as I got here via l 710 research with tannnoy may shed light.
 
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