Volume issue with Connect:Amp and Bose freespace 51 speakers

You may want to submit a diagnostic from settings advanced and post number given here as well to get a checkup on your system.

While this is also available on Google, the manual for my Bose 251 external speakers has a table that sets out the recommended core thickness of the speaker wire, for different speaker wire lengths.

Before making the wire change, a diagnostic is a good idea; I just think it is unlikely that two sets of amps+speakers with suffer the exact same problem because of a defect in both amps.

Hi

I have a pair of Bose 251 connected to My Connect:amp and no sound is coming from the speakers. I swopped with an other amp that is connected to a pair of bose 791 (which works perfect) and still no sound. I figure there is no problem with the connect:amp but is it compatible with the 251? Same cords (1.5mm) in both pairs and roughly the same distance.

@Erik - Apologies for the limited amount of help I can give as I did not install the setup but I can confirm that the connect amp is definitely compatible with a pair of Bose 251s if installed correctly and using the correct cabling per the Bose manual (am listening to it working right now). There doesn't seem to be any additional components involved and there is around 7 meters of cable to the furthest speaker - just the amp, cables and speakers and all working fine.
Re volume issues mentioned in the historic posts, with this connect amp/251 setup sound is fairly thin but perfectly audible up to around 45-50% on the sonos app volume control and from then on the base starts coming in and balances out the sound nicely. It is worth adjusting EQ to weight in favour of a base heavy sound (I guess not much of a surprise for wall mounted outdoor speakers). By 100% on the volume control, volume is definitely up at PA system/neighbourhood bothering levels with a significant wide and long range as promised by Bose. Hopefully others can give more technical help.

Compared to most other amps, 50% level on Connect Amp is the same as 25% on them. And when they will stop delivering clean power at about 60%, Connect Amp will keep doing so all the way to 100%.

It is just a different way of constructing the volume control. Many amps like to go loud early to give an impression of power. Connect Amp does not do that, but leaves all the range of slider useful.

The Connect Amp will work just fine with the 251 pair. Check all connections if there is no sound.

Many thanks for your replies. There is virtually no sound coming from the speakers and they are all connected with he exact same type of cable and similar distances. I just find it so unlikely that both the speakers are malfunctioning.

Are you seeing music playing by the time count in the Sonos controller for the Connect Amp? Have you turned up the volume slider to at least 30%?

If yes, because both cables and both speakers being faulty is unlikely, the first step would be to put another amp and see if sound comes from the 251 pair if that amp is fed by a source. If that makes the speakers sing, there is a fault in the Connect Amp.

I didn't see if anyone had addressed this as a possibility, but for the user with the pre-installed system (in the home that was purchased), there is a chance that the original install was for a 70V or 100V system, and thus had a transformer installed at each speaker (if they are consumer 4/8 ohm units). That might create the volume issues. Bose does have a commercial verison that is 70V (Freespace 360P) that looks almost exactly like the consumer version (Freespace 51).