Modwright KWA 150 and Proac D38R

Hi I am unable to test this amp (which I have purchased) on the Proac D38R which I am considering. Particularly keen to know if the Modwright can control the bass and make the Proac sound good at low volumes.

Your thoughts would be welcome.

I tried the Proac with the Conrad Johnson ET 250S and was not happy with the sound at low volumes - there was very low midrange coming through relative to bass and highs.

Would the Modwright do a better job?
I listen ProAc d38 and KWA-150, it is sung much better than my former Naim by 250.2 amplifier. I loved Naim-ProAc a sheaf and when has made amplifier replacement, have grown fond of system even more. It is enough bass with this amplifier.
Hi Andrew, the Proac speakers you mentioned are senstive speakers (91db) and rated to 250 watts into 4ohms which is a fairly benign load for an amp, and the KWA-150 is putting out close to 400 watts into 4ohms. It uses 2 x 500va transformers (1000va) and there is a LOT of current on tap. Lou from Daedalus Audio in your previous thread commented the KWA-150 has the best bass of any amp he has ever heard. "Best" not to be confused with "most" since that is a pointless goal. I was very impressed with the solidity, texture and detail of the bass. Very musical!
Do you have the opportunity to hear the ProAc with any other amp at all? If low volume performance is important to you, I recommend verifying you can get that from the speaker.

Some speakers are much better at low volumes than others, and it's not necessarily something a different amp will address. It might help, but just saying that ideally I would make sure.

Another variable to consider is the preamp: what was the preamp you heard these with, and what are you planning to use?
Since you've already purchased the amp, then once you've hooked it up and played it, please report back. Your experience will be valuable to future readers.

BTW, the 250 watt specification relates to the maximum recommended continuous power the speakers are designed to handle. The spec has nothing to do with how well the speakers are driven by a given amp, but rather it informs you to be careful when using an amp with more power than 250 watts. Turning up the volume to a point at which the speakers require more than 250 watts may damage the drivers. The decibel level where this would happen on the D38R would be between 112dB and 115dB measured at a distance of 1 meter from the speakers (considering the 91dB/1w/1m spec). It's unlikely you would listen this loudly for long periods, unless you have a very large room to fill, but caution is still advised.


91dB = 1 watt
94dB = 2 watts
97dB = 4 watts
100dB = 8 watts
103dB = 16 watts
107dB = 32 watts
110dB = 64 watts
113dB = 128 watts
115dB = 256 watts

I once owned Von Schweikert VR4 Gen III HSE speakers with Hovland capacitors. Those speakers were rated to 1000 watts per channel. Talk about being able to handle lots of power without blowing up!
107dB = 32 watts
110dB = 64 watts
113dB = 128 watts
115dB = 256 watts
Made a math error at 107dB. It should read:

106dB = 32 watts
109dB = 64 watts
112dB = 128 watts
115dB = 256 watts
Andrew, if you read the 6moons review of the KWA-150 you will notice reviewer Srajan Ebaen tested the KWA-150 with a pair of 97db/12ohm efficient Zu Essence speakers and there were no issues. Coming back to your OP, Srajan commented bass was excellent and low level detail was "phenominal" paired with the Zu's.
The OP isn't asking about a match with 97dB/12 ohm Zu speakers.

He's asking about a match with 91dB/4 ohm Proac speakers.

Equating an amp/speaker match on 97dB/12 ohm speakers to an amp/speaker match on 91dB/4 ohm speakers demonstrates a basic lack of understanding of the topic.
01-02-11: Tvad

"Equating an amp/speaker match on 97dB/12 ohm speakers to an amp/speaker match on 91dB/4 ohm speakers demonstrates a basic lack of understanding of the topic."

Tvad, I was simply commenting that in the 6moons review the KWA-150 did not overwhelm even more efficient speakers. The KWA-150 is in fact capable of driving far less efficient speakers than the mentioned Proacs. I was simply assuring the OP this choice of amp will not over power the Proacs. You're reading too much into my comments.